APRILIA RS 50 - 2001 Specifications

Workshop manual
Fornacette (PI) - ITALY
RS 50
Via G. Galilei, 1
30033 Noale (VE)
Tel. +39 (0) 41 - 5829111
Fax +39 (0) 41 - 441054
www.aprilia.com
www.serviceaprilia.com
Italy
8140250
Produced by
aprilia s.p.a.
979 X
LIST OF SECTIONS
Introduction
This manual contains information on how to perform
the usual vehicle service procedures. This manual
does not describe all of the procedures necessary to
repair and service the vehicle in detail.
This publication is intended for use by aprilia dealers
and their trained, experienced mechanics.
The descriptions of many service and repair operations have been intentionally omitted, as it is assumed
that the users of this manual have basic mechanical
training and basic knowledge of the procedures used
for motor vehicle repair, as well as safety rules necessary to ensure their safety and that of the public while
repairing motor vehicles. Therefore, it is imperative
that you do not attempt to perform any maintenance
or repair procedure with which you are not thoroughly
familiar, and fully qualified to perform. Such an attempt can result in defective repairs, which can be
dangerous both to you, to the owner or user of the
vehicle, and to the public in general.
The information and illustrations in this manual are
current as of the manual’s date of issue.
Since aprilia s.p.a. continually improves its products,
there may be some differences between the vehicle
you are servicing and the illustrations and instructions
given in this manual. If you have any questions
regarding the applicability of any service procedure
given in this manual, contact aprilia consumer services (A.C.S.). A.C.S. Technical Counselors will be
able to assist you with any problems you might face
as well as providing you with information on any
updates and technical changes to the vehicle you are
servicing.
Any change made to technical specifications and
vehicle servicing procedures will be documented and
distributed to aprilia dealers all over the world.
These changes will be incorporated in later editions of
this manual.
For further information refer to:
SPARE PARTS CATALOGUE # 323 X;
engine workshop manual # 966 X;
service tools manual.
aprilia s.p.a. reserves the right to modify specifications and characteristics of any of its models at any
time. aprilia makes no representation that this manual
covers any such changes.
This manual is protected by copyright in all countries.
Electronic storage and the total or partial reproduction
and adaptation by any means is prohibited.
The mention of products or services supplied by
entities other than aprilia is for information purposes
only and is not binding in any way.
aprilia s.p.a. is not responsible for the performance or
use of any of these products.
First edition: March 2001
Produced and printed by:
CLD s.r.l. Technical manuals division
Via D. Alighieri, 37/A - 56012 Fornacette (PI)
Tel. +39 (0)587 - 42 28 00
Fax +39 (0)587 - 42 28 01
www.cld.it
E-mail: cld@cld.it
on behalf of:
aprilia S.p.A.
Via G. Galilei, 1 - 30033 Noale (VE) - Italia
Tel.
+39 (0)41 - 58 29 111
Fax +39 (0)41 - 44 10 54
www.aprilia.com
www.serviceaprilia.com
General information
Routine maintenance
operations
Engine
Fuel system
Cooling system
Electrical system
Body work
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2
3
4
5
6
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CONTENTS
Chapter 1
POSITION OF SERIAL NUMBERS ....................................................................................................... 1-2
SAFETY WARNINGS FOR FUEL, LUBRICANTS COOLANT AND OTHER COMPONENTS .............. 1-3
LUBRICANTS ........................................................................................................................................ 1-5
RUNNING-IN RULES ............................................................................................................................. 1-9
POSITION OF THE WARNING ADHESIVE LABELS .......................................................................... 1-10
SPARE PARTS ..................................................................................................................................... 1-12
TECHNICAL DATA ............................................................................................................................... 1-12
LUBRICANT CHART............................................................................................................................ 1-14
SPECIAL TOOLS
............................................................................................................................ 1-15
GENERAL SPECIFICATIONS FOR TORQUE WRENCH SETTINGS ................................................ 1-17
ABBREVIATIONS / SYMBOLS / INITIALS .......................................................................................... 1-18
Chapter 2
SERVICING SCHEDULE ....................................................................................................................... 2-3
LUBRICATION POINTS ......................................................................................................................... 2-4
ARRANGEMENT OF THE INSTRUMENTS / CONTROLS ................................................................... 2-5
INSTRUMENTS AND INDICATORS ...................................................................................................... 2-5
BATTERY ............................................................................................................................................... 2-6
CHECKING AND CLEANING THE TERMINALS ................................................................................... 2-7
REMOVING THE BATTERY .................................................................................................................. 2-7
CHECKING THE ELECTROLYTE LEVEL ............................................................................................. 2-8
RECHARGING THE BATTERY ............................................................................................................. 2-8
INSTALLING THE BATTERY ................................................................................................................. 2-9
LONG PERIOD OF BATTERY NON-USE ............................................................................................. 2-9
SPARK PLUG ........................................................................................................................................ 2-9
AIR CLEANER ..................................................................................................................................... 2-11
ADJUSTING THE THROTTLE CONTROL .......................................................................................... 2-12
IDLING ADJUSTMENT ........................................................................................................................ 2-12
CARBURETOR CONTROLS ............................................................................................................... 2-13
COLD START LEVER .......................................................................................................................... 2-13
CHECKING THE GEARBOX OIL ........................................................................................................ 2-13
CHECKING TOPPING UP ................................................................................................................... 2-14
CHANGING THE GEARBOX OIL ........................................................................................................ 2-15
2 STROKE OIL TANK .......................................................................................................................... 2-17
COOLANT ............................................................................................................................................ 2-18
CHECKING AND TOPPING UP THE BRAKE FLUID .......................................................................... 2-22
FRONT BRAKE .................................................................................................................................... 2-23
REAR BRAKE ...................................................................................................................................... 2-25
CHANGING THE FRONT BRAKE FLUID ............................................................................................ 2-26
CHANGING THE REAR BRAKE FLUID .............................................................................................. 2-27
BLEEDING THE BRAKE CIRCUITS .................................................................................................... 2-28
ADJUSTING THE REAR BRAKE ........................................................................................................ 2-30
ADJUSTING THE CLUTCH ................................................................................................................. 2-31
ADJUSTING THE SHIFT LEVER......................................................................................................... 2-31
STEERING ........................................................................................................................................... 2-32
DRIVE CHAIN ...................................................................................................................................... 2-33
ROUTINE MAINTENANCE AND SERVICING OPERATIONS ............................................................ 2-36
FUEL LINES ......................................................................................................................................... 2-38
BRAKE PIPES/HOSES ........................................................................................................................ 2-38
COOLING ............................................................................................................................................. 2-38
SYSTEM HOSES ................................................................................................................................. 2-38
2 STROKE OIL PIPES/HOSES............................................................................................................ 2-39
TIGHTENING NUTS AND BOLTS ....................................................................................................... 2-39
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FASTENERS ........................................................................................................................................ 2-40
Chapter 3
ENGINE COMPONENTS THAT CAN BE REMOVED WITHOUT
REMOVING THE ENGINE FROM THE FRAME ................................................................................... 3-2
REMOVING THE COMPLETE ENGINE FROM THE FRAME ............................................................... 3-3
Chapter 4
FUEL TANK ............................................................................................................................................ 4-2
MAINTENANCE ..................................................................................................................................... 4-3
CHECKING THE FUEL FEED ............................................................................................................... 4-3
REMOVING THE FUEL VALVE ............................................................................................................. 4-4
REMOVING THE CARBURETOR ......................................................................................................... 4-4
REMOVING THE 2 STROKE OIL TANK ................................................................................................ 4-6
Chapter 5
REMOVING THE RADIATOR ................................................................................................................ 5-2
REMOVING THE FILLER CAP .............................................................................................................. 5-3
Chapter 6
INTRODUCTION .................................................................................................................................... 6-2
RECOMMENDED EQUIPMENT ............................................................................................................ 6-2
MAIN WIRING DIAGRAM ...................................................................................................................... 6-3
LOCATION OF COMPONENTS ............................................................................................................ 6-4
IGNITION CIRCUIT ................................................................................................................................ 6-5
RECHARGE AND GENERAL POWER SUPPLY CIRCUIT ................................................................... 6-7
STARTER CIRCUIT ............................................................................................................................... 6-9
SENSOR CIRCUIT .............................................................................................................................. 6-12
DIRECTION INDICATORS CIRCUIT ................................................................................................... 6-13
HORN CIRCUIT ................................................................................................................................... 6-15
BRAKING LIGHTS CIRCUIT ............................................................................................................... 6-17
LIGHT CIRCUIT ................................................................................................................................... 6-19
LIGHT CIRCUIT
.............................................................................................................................. 6-20
ELECTRICAL CONNECTORS ............................................................................................................. 6-23
BULBS ................................................................................................................................................. 6-24
CHANGING THE HEADLIGHT BULBS ............................................................................................... 6-24
CHANGING PARKING LIGHT BULB ................................................................................................... 6-24
CHANGING HIGH BEAM BULB .......................................................................................................... 6-25
CHANGING LOW BEAM BULB ........................................................................................................... 6-25
CHANGING THE FRONT AND REAR TURN SIGNAL BULBS ........................................................... 6-26
CHANGING THE REAR LIGHT BULB ................................................................................................. 6-26
ADJUSTING THE HEADLIGHT BEAM VERTICALLY ......................................................................... 6-27
ADJUSTING THE HEADLIGHT BEAM HORIZONTALLY .................................................................... 6-27
CHANGE FUSES ................................................................................................................................. 6-29
CHECKING THE SWITCHES .............................................................................................................. 6-31
Chapter 7
APPLYING THE TRANSFERS ............................................................................................................... 7-2
REMOVING THE RIDER SADDLE ........................................................................................................ 7-4
REMOVING THE SADDLE LOCK ......................................................................................................... 7-4
REMOVING THE PASSENGER SADDLE ............................................................................................. 7-4
REMOVING THE SIDE FAIRINGS ........................................................................................................ 7-5
REMOVING THE FUEL TANK ............................................................................................................... 7-6
EMPTYING THE FUEL TANK ................................................................................................................ 7-7
REMOVING THE AIR BOX .................................................................................................................... 7-8
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REMOVING THE LEFT HANDLEBAR HANDGRIP ............................................................................... 7-9
REMOVING THE LEFT HANDLEBAR ELECTRICAL CONTROLS ....................................................... 7-9
REMOVING THE CLUTCH CONTROL ............................................................................................... 7-10
REMOVING THE THROTTLE CONTROL ........................................................................................... 7-11
REMOVING THE RIGHT HANDLEBAR ELECTRICAL CONTROLS .................................................. 7-12
REMOVING THE STOP SWITCH ........................................................................................................ 7-12
REMOVING THE FRONT BRAKE CONTROL .................................................................................... 7-13
REMOVING THE RIGHT HANDLEBAR .............................................................................................. 7-14
REMOVING THE LEFT HANDLEBAR ................................................................................................. 7-14
REMOVING THE IGNITION SWITCH/STEERING LOCK ................................................................... 7-15
REMOVING THE REAR VIEW MIRRORS .......................................................................................... 7-15
REMOVING THE FRONT FAIRING ..................................................................................................... 7-16
REMOVING THE WINDSHIELD .......................................................................................................... 7-16
REMOVING THE HEADLIGHT ............................................................................................................ 7-17
REMOVING THE DASHBOARD .......................................................................................................... 7-17
REMOVING THE INSTRUMENT PANEL FRAME ............................................................................... 7-18
REMOVING THE FRONT MUDGUARD .............................................................................................. 7-19
REMOVING THE FRONT DIRECTION INDICATORS ........................................................................ 7-19
REMOVING THE LOWER FAIRING .................................................................................................... 7-20
REMOVING THE REAR FAIRING ....................................................................................................... 7-21
REMOVING THE REAR LIGHT ........................................................................................................... 7-22
REMOVING THE LICENSE PLATE HOLDER ..................................................................................... 7-22
REMOVING THE PILLAR COVER ...................................................................................................... 7-23
REMOVING THE REAR TURN SIGNALS ........................................................................................... 7-23
REMOVING THE REAR MUDGUARD ................................................................................................ 7-24
REMOVING THE REAR FOOTREST SUPPORTS ............................................................................. 7-24
REMOVING THE REAR FOOTRESTS ............................................................................................... 7-25
REMOVING THE FRONT FOOTREST SUPPORT (LEFT SIDE) ........................................................ 7-25
REMOVING THE FRONT FOOTREST SUPPORT (RIGHT SIDE) ..................................................... 7-26
REMOVING THE FRONT FOOTREST................................................................................................ 7-27
REMOVING THE SHIFT LEVER ......................................................................................................... 7-27
REMOVING THE BRAKE PEDAL ....................................................................................................... 7-28
REMOVING THE EXHAUST PIPE ...................................................................................................... 7-28
REMOVING THE MUFFLER ............................................................................................................... 7-30
CLEANING THE EXHAUST PIPE AND MUFFLER ............................................................................. 7-31
REMOVING THE SIDE STAND ........................................................................................................... 7-32
REMOVING THE CHAIN GUIDE ......................................................................................................... 7-33
REMOVING THE PILLAR .................................................................................................................... 7-33
FRONT WHEEL ................................................................................................................................... 7-36
REMOVING THE COMPLETE FRONT WHEEL.................................................................................. 7-37
DISASSEMBLING THE FRONT WHEEL............................................................................................. 7-38
REASSEMBLY FRONT WHEEL .......................................................................................................... 7-40
FRONT BRAKE .................................................................................................................................... 7-42
CHANGING THE FRONT BRAKE PADS ............................................................................................. 7-43
REMOVING THE FRONT BRAKE MASTER CYLINDER .................................................................... 7-44
REMOVING THE BRAKE DISC ........................................................................................................... 7-44
FRONT FORK ...................................................................................................................................... 7-45
REMOVING THE FRONT FORK ......................................................................................................... 7-46
DISASSEMBLING THE FORK ............................................................................................................. 7-47
CHECKING THE COMPONENTS ....................................................................................................... 7-50
REFITTING THE FORK ....................................................................................................................... 7-51
STEERING ........................................................................................................................................... 7-54
REMOVING THE STEERING .............................................................................................................. 7-55
CHECKING THE COMPONENTS ....................................................................................................... 7-56
REFITTING THE STEERING ............................................................................................................... 7-57
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REAR WHEEL ..................................................................................................................................... 7-58
REMOVING THE COMPLETE REAR WHEEL .................................................................................... 7-59
REASSEMBLY REAR WHEEL ............................................................................................................ 7-61
REAR BRAKE ...................................................................................................................................... 7-63
CHANGING THE REAR BRAKE PADS ............................................................................................... 7-64
REMOVING THE REAR BRAKE DISC ................................................................................................ 7-65
REMOVING THE REAR BRAKE MASTER CYLINDER ...................................................................... 7-65
REMOVING THE REAR SUSPENSION .............................................................................................. 7-66
CHECKING THE SUSPENSION COMPONENTS ............................................................................... 7-67
REMOVING THE DRIVE CHAIN ......................................................................................................... 7-68
REMOVING THE SWING ARM ........................................................................................................... 7-69
DISASSEMBLING THE SWING ARM .................................................................................................. 7-71
REASSEMBLING THE SWING ARM ................................................................................................... 7-72
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SAFETY WARNINGS
Throughout this manual, you will see the following symbols:
WARNING
When you find this symbol on the vehicle or in the manual, this indicates that a potential for serious personal injury or death exists.
Failure to follow this warning may result in serious risk of personal injury or death, of the mechanic working on the vehicle, the operator of the vehicle, or the general public.
It also indicates that serious and permanent damage to the vehicle is possible.
CAUTION
This statement indicates a potential hazard which may result in some personal injury, or damage to the
vehicle.
NOTE The word “NOTE” in this manual precedes important information or instructions to which special attention
must be given.
GENERAL SAFETY RULES
CARBON MONOXIDE
If it is necessary to run the engine in order to carry out maintenance operation, make sure that the area in wich you
are operating is properly ventilated.
Never run the engine in enclosed spaces.
If it is necessary to work indoors, use an exhaust evacuation system.
WARNING
The exhaust fumes contain carbon monoxide, a poisonous gas that can cause loss of consciousness and
even death.
GASOLINE
Work in a well ventilated area. Keep cigarettes, flames or sparks away from the work area and from the place
where gasoline is stored.
WARNING
Gasoline is extremely flammable and becomes explosive under certain conditions.
KEEP GASOLINE AWAY FROM CHILDREN.
HOT COMPONENTS
WARNING
The engine and the components of the exhaust system become very hot and remain hot for some time
after the engine has been stopped.
Before handling these components, wear insulating gloves or walt until the engine and the exhaust system
have cooled down.
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USED ENGINE OIL AND FORK OIL
WARNING
Use latex glaves for the maintenance operations that require contact with used oil.
Used oil may cause skin cancer if repeatedly left in contact with the skin for prolonged periods.
Although this is unlikely unless you handle used oil on a daily basis, it is advisable to thoroughly wash
your hands with soap and water after handling used oil.
KEEP OIL AWAY FROM CHILDREN.
BRAKE FLUID
CAUTION
The brake fluid can damage painted, plastic or rubber parts. When performing maintenance operations on
the braking system, place a clean shop towel on these parts.
Always wear goggles when servicing the brake system with brake fluid.
Brake fluid is extremely destructive to your eyes.
If you should accidentally get brake fluid in your eyes, flush immediately with a large quantity of cool clear
water and seek professional medical assistance immediately.
KEEP BRAKE FLUID AWAY FROM CHILDREN.
CLUTCH CONTROL FLUID
CAUTION
The clutch control fluid can damage painted, plastic or rubber parts.
When performing maintenance operations on the clutch control system, place a clean shop towel on these
parts.
Always wear goggles when servicing the clutch control system with clutch control fluid.
Clutch control fluid is extremely destructive to your eyes.
If you should accidentally get clutch control fluid in your eyes, flush immediately with a large quantity of
cool clear water and seek professional medical assistance immediately.
KEEP CLUTCH CONTROL FLUID AWAY FROM CHILDREN.
COOLANT
In certain conditions, the ethylene glycol contained in the engine coolant is flammable: its flame is invisible, but you
can be burned anyway.
WARNING
Avoid spilling the engine coolant on the exhaust system or on the engine components.
They may be hot enough to cause the coolant to ignite and burn without a visible flame.
The coolant (ethylene glycol) can cause skin irritation and is poisonous if swallowed.
Engine coolant is sweet tasting, and therefore extremely attractive to pets and other animals, as well as
being extremely toxic.
Do not leave coolant in an open container where animals may be able to drink it.
KEEP COOLANT AWAY FROM CHILDREN.
Do not remove the radiator cap when the engine is hot. The coolant is under pressure and may cause
burns.
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BATTERY HYDROGEN GAS AND ELECTROLYTE
WARNING
The battery gives off explosive gases; keep cigarettes, flames and sparks away from the battery.
Provide adequate ventilation when operating or recharging the battery.
The battery contains sulphuric acid (eloctrolyte). Contact with the skin or the eyes may cause serious
burns.
Always wear tight fitting goggles and protective clothing when handling battery electrolyte.
It is particularly important for you to protect your eyes, since even a minuscule amount of battery acid can
destroy your vision.
Should you accidentally get even the smallest amount of battery acid on your skin or eyes, immediately
flush with large quantities of clear cool water and immediately seek professional medical attention.
The electrolyte is poisonous.
If the electrolyte is accidentally swallowed, drink large quantities of water or milk and then milk of magnesia or vegetable oil.
Seek professional medical attention immediately.
KEEP BATTERIES AND ELECTROLYTE AWAY FROM CHILDREN.
PRECAUTIONS AND GENERAL INFORMATION
Follow with care these recommendations when repairing, disassembling and reassembling the vehicle.
WARNING
The use of open flames is forbidden for any type of operation.
Before commencing any service or inspection operation on the vehicle, switch off the engine and remove
the key, wait until the engine and the exhaust system have cooled down and, if possible, raise the vehicle
with the suitable equipment onto firm flat ground.
In order to avoid burns, be careful not to touch any parts of the engine or exhaust systems which have not
cooled down completely.
The brakes also get quite hot in operation.
Be sure that the brakes have cooled thoroughly before beginning any service operations.
Avoid the temptation to hold any hardware or other part of the vehicle in your mouth while working on the
vehicle.
No part of the motorscooter is edible and some of the coatings, plastics, and platings, etc. are noxious if
not outright toxic.
If not expressly described, the reassembly of the units is carried out by reversing the order of operations.
Handle fuel with the greatest caution.
See gasoline warning. Never use fuel as a solvent for cleaning the vehicle.
Disconnect the negative cable (-) from the battery when electric welding.
When two or more persons are working together, make sure that each is working in safe conditions.
Be sure that all the mechanics working on any one vehicle are thoroughly briefed as what each will be
doing, and insure that one mechanic is responsible for insuring that all safety related items, such as tightening torques, are properly considered.
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BEFORE DISASSEMBLY
Remove all dirt, mud, dust and foreign bodies from the motorcycle before removing any components.
When specified, use the service tools specially designed for this motorcycle.
DISASSEMBLY OF COMPONENTS
Never loosen and/or tighten nuts and bolts with pliers or other similar tools: always use a proper wrench.
Mark the positions of all unions and connections (hoses, wires, etc.) before disconnecting them with clearly distinguishable marks.
Each component must be clearly marked so that it can be identified for refitting.
Clean and wash each removed component with fire-proof solvent.
Paired components must be kept together, as they become “matched” after normal wear. Some paired components
must either be used together or both replaced.
Keep away from heat sources.
REFITTING COMPONENTS
WARNING
Never use a circlip twice. When a circlip is removed, it must be replaced with a new one. When assembling
a new circlip, be careful not to stretch its ends more than strictly necessary to place it on the shaft. After
installing a circlip, make sure that it is completely and firmly inserted in its seat.
Do not used compressed air to clean bearings.
NOTE Bearings must turn freely with no sticking and/or noise. Replace bearings that show any roughness when
the inner race is turned.
Use only original aprilia Spare Parts for replacement.
Use only the recommended lubricants and sealing agents.
Lubricate all metal parts before refitting them. Pay particular attention to lubricate internal engine parts such as
piston rings, valves, etc. Use proprietary assembly lubricants when appropriate.
When tightening nuts and bolts, start with the larger diameter or inner ones and proceed in diagonal order. Tighten
them in gradual steps before applying the final tightening torque.
Always replace all gaskets, circlips, snap rings and O-rings. Replace self-locking nuts if the finger torque allows the
nut to be run on to its matching bolt more than one half turn. Replace the pins, screws and bolts if they are nicked,
cracked, or if there is any sing of thread damage.
Thoroughly clean all mating surfaces before reassembly.
Apply a thin film of lithium-based grease to oil seal rims.
Always replace oil seals. Upon reassembly, apply a thin film of lithium-based grease to the sealing lip of all oil seals
before it is assembled over its matching shaft.
Check to make sure that each component has been fitted properly.
After carrying out repairs or routine servicing, go through the pre-ride checklist thoroughly before riding the motorcycle or allowing it to be ridden. Take a trial run in a parking lot or other low traffic area before returning the motorcycle to its owner.
USING THE MANUAL
HOW TO USE THE MANUAL:
This manual is divided up into chapters. Each chapter is based on a category of main components. Refer to the
MAIN CONTENTS list.
Unless expressly stated otherwise, follow the disassembly steps in reverse order when reassembling units. The
terms “right” and “left” are intended as the rider’s right and left when sitting in the normal riding position. Consult
the “USE AND MAINTENANCE” handbook for information on the normal use and servicing of the motorcycle.
In this manual, variants from the standard version are marked with the following symbols:
Automatic Switch-on Device version
optional
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NOTES
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POSITION OF SERIAL NUMBERS
These numbers are required for vehicle registration.
NOTE The alteration of the identification numbers is
an offence, punishable with criminal and administrative sanctions. In particular, the alteration of the frame
number will result in the immediate invalidation of the
warranty.
A
VEHICLE IDENTIFICATION NUMBER (V.I.N.)
(FRAME NUMBER)
B
Every motorcycle produced by aprilia receives a
vehicle identification number (V. I. N.) stamped on the
steering head of the frame (A), as shown above, and
also on the identification plate (B) which is located on
the front portion of the main frame.
INFORMATION CONTAINED IN THE MOTORCYCLE
IDENTIFICATION NUMBER
✩ZD4PG0000X0000000✩
DIGIT MEANING
1) Manufacturer’s identification alphanumeric code.
2) Motorcycle type.
3) Model.
4) Country for which the motorcycle is intended.
5) Production year.
6) Assembling factory designation
(N = NOALE- VE- ,
S = SCORZÉ -VE- ,
0 = NOT SPECIFIED).
7) Sequential serial number.
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ENGINE NUMBER
The engine number is stamped on the rear of the
engine, next to the sprocket.
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SAFETY WARNINGS FOR FUEL, LUBRICANTS COOLANT AND OTHER COMPONENTS
FUEL
WARNING
Gasoline is extremely flammable and in some
conditions can become explosive.
Therefore, it is necessary to refuel and carry out
maintenance operations involving the fuel system
in a well-ventilated area with the engine off.
Do not refuel or do any maintenance on the fuel
system with the engine running.
Do not smoke while refueling or near fuel vapors.
Never allow any portion of the fuel system to come
in contact with open flames, sparks or other heat
sources.
Be careful to avoid spilling fuel when you are
refueling. Spilled fuel couid ignite when it contacts
hot engine or exhaust system surfaces.
If you accidentally spill some fuel, make sure that
it is wiped up or completely evaporated before
starting the vehicle.
Since gasoline expands in the fuel tank when the
vehicle is sitting in the open sun, never fill the tank
completely to the brim.
Leave at least one inch of expansion space.
Avoid any contact of the fuel with your skin, and
avoid inhalation of fuel vapors.
Do not ever attempt to siphon fuel from one container to another using your mouth as suction for a
siphon hose.
Gasoline is poisonous and carcinogenic and
contains chemical substances that cause birth
defects and other reproductive problems.
If gasoline should be accidentally spilt on the skin
or clothes, immediately wash it off with soap and
water and change clothes.
Should you accidentally spill gasoline in your
eyes, flush with a large quantity of water and
immediately contact a health professional.
Should you accidentally get gasoline into your
mouth, do not induce vomiting.
Drink a large quantity of milk or clear water and
immediately contact a health professional.
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Never try to siphon gasoline by sucking it with
your mouth.
Use a manual pump or a similar system.
If your vehicle overturns, it will leak gasoline
which is extremely flammable.
Flames or sparks may ignite this which will not
only destroy the vehicle but also could do serious
property damage to surrounding property and
cause serious injuries or even death.
ALWAYS KEEP GASOLINE AWAY FROM CHILDREN.
DISPOSE OF UNWANTED GASOLINE PROPERLY,
DO NOT DUMP IT INTO STORM SEWERS OR INTO
A SINK OR TOILET.
CAUTION
Before opening the fuel filler cap, if necessary,
clean the it cap and the part around it with a clean
cloth. Prevent any foreign material from getting
into the fuel tank, this could lead to serious engine damage.
If you use any container or funnel for refueling,
make sure that it is perfectly clean.
Any foreign matter getting into the fuel tank may
lead to severe damage.
WARNING
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Do not add any additives or other substances to
the gasoline.
Do not refuel the tank completely; the fuel should
never be touching the rim of filler cap seat hale.
After refueling, replace the fuel filler cap (1) in the
correct position and make sure that it is properly
closed.
Use only unleaded gasoline minimum octane rating
(M+R)/2 method 90.
FUEL TANK CAPACITY
(reserve included): 13 l (3.4 gal).
TANK RESERVE: 2.6 l (0.69 gal).
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LUBRICANTS
WARNING
Proper vehicle lubrication is critical to safe operation. Failure to maintain proper lubricant levels or
to use the proper type of clean, new lubricant, can
lead to an engine or transmission seizure with
subsequent accident, serious injury or death.
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Use latex gloves for the maintenance operations
that require contact with used oil.
Used oil may cause skin cancer if repeatedly lefl
in contact with the skin for prolonged periods.
Although this is unlikely unless you handle used
oil on a daily basis, it is advisable to thoroughly
wash your hands with soap and water after handling used oil.
KEEP OIL AWAY FROM CHILDREN.
DISPOSE OF OIL PROPERLY.
CAUTION
Be very careful when putting oil in your vehicle
not to spill oil.
Clean up any oil spilled immediately because oil
can damage the finish of your vehicle.
Also, oil on the tires creates an extremely slippery
and therefore dangerous situation.
In case of lubricant leakage do not ride the vehicle, but check to determine the cause of the
leakage and repair it.
ENGINE OIL
WARNING
If the engine oil pressure warning light LED “ ” (1)
remains on (when the engine is running), or if it
comes on during the normal running of the engine,
this means that the oil system is not developing
sufficient pressure.
Failure to heed this warning can lead to engine
seizure, upset, and serious injury or even death.
CAUTION
1
Perform these maintenance operations at one-half
of the specified intervals, if the vehicle is often
used in rainy or very dusty conditions, or on unpaved roads.
As an alternative to the recommended oil, it is possible
to use high-quality oils with characteristics in compliance
with or superior to the ISO-L-ETC ++, A.P.I. TC ++
specifications.
ch. 1
Release 00
2001-03
1-5
General information
RS 50
FORK OIL
WARNING
By changing the damper settings and/or the
viscosity of the oil contained in them, the suspension response may be altered partially.
Standard oil viscosity: SAE 20 W.
The viscosity ratings which can be chosen based
on the type of fork stiffness desired (SAE 5W soft,
20W stiff).
The two products can be used in different percentages until the desired response is obtained.
One of the properties of F.A. and F. A. 5W or
F. A. 20W fork oil (as an alternative
FORK 5W
or
FORK 20W) is that their viscosity changes
little with changes in temperature and their damping response therefore remains constant.
COOLANT
CAUTION
Do not use the vehicle if the coolant is below the
minimum prescribed level.
Before setting off, and every 2,000 km (1,228 mi),
check the level of the coolant, see (CHECKING AND
TOPPING UP); renew the coolant every two years, see
(CHANGING THE COOLANT).
WARNING
Coolant is poisonous! Do not ingest coolant under
any circumstance.
Should you get coolant in your mouth, rinse with
cool water and immediately seek medical attention.
Coolant is also very dangerous to your skin and eyes.
Should you accidentally get coolant on your clothing or skin, change clothes immediately.
Wash coolant from your skin with hot water and
soap.
Should you get coolant in your eyes, flush with
plenty of cool water and seek professional medical
help at once.
Should someone swallow coolant accidentally,
induce vomiting, rinse mouth with water, and
immediately seek professional medical attention.
DISPOSE OF THE COOLANT PROPERLY.
1-6
Release 00
2001-03
ch. 1
General information
RS 50
BE SURE TO KEEP THE DRAINED COOLANT
AWAY FROM CHILDREN AND PETS.
IT IS SWEET TASTING, AS WELL AS EXTREMELY
POISONOUS, AND IS VERY ATTRACTIVE TO
CHILDREN AND PETS.
Use extra caution not to spill the coolant on any
hot parts of the engine. It is flammable, and can
emit invisible, noxious fumes.
1
Always wear rubber or latex gloves when servicing the cooling system.
The coolant is made up of 50% water and 50%
antifreeze.
This mixture is ideal for most running temperatures
and ensures good protection against corrosion.
It is advisable to keep the same mixture also in the hot
season, since in this way losses due to evaporation
are reduced and it is not necessary to top up very
frequently.
The mineral salt deposits left in the radiator by evaporated water are thus reduced and the efficiency of the
cooling system remains unchanged.
If the outdoor temperature is below 0°C, check the
cooling circuit frequently and if necessary increase the
antifreeze concentration (up to maximum 60%).
CAUTION
Use only distilled water when topping off the
cooling system. This will reduce damage to the
engine.
WARNING
The coolant is very hot.
Do not remove the filler cap (1) when the engine is
hot since the coolant is under pressure and it will
splash out violently.
If it gets in contact with the skin or with your
clothing, it may cause severe burns.
1
WARNING
Be aware of the risk of burns from the coolant.
Check the coolant level and top up the expansion
tank only after the engine has thoroughly cooled.
Do not use your fingers or any other object to
check if there is enough coolant.
ch. 1
Release 00
2001-03
1-7
General information
RS 50
On the basis of the desired freezing temperature of the coolant mixture, add to the water the percentage of coolant
indicated in the following table.
Freezing point
°C (°F)
Coolant
% of volume
-20° (-4°)
35
-30° (-22°)
45
-40° (-40°)
55
NOTE The characteristics of the various antifreeze liquids are different.
Be sure to read the label on the product to learn the degree of protection it guarantees.
CAUTION
Use only antifreeze and anticorrosive without nitrite in order to ensure protection at least -35°C.
GEARBOX OIL
CAUTION
Gearbox oil can cause serious skin damage if handled on a daily basis over a long period of time.
You are advised to wash your hands thoroughly after handling the oil.
Do not dispose of the oil in drains, water courses or the soil.
Take the oil to (or have it collected by) the nearest used oil disposal agency or the supplier.
You are advised to wear rubber gloves when carrying out maintenance work.
Change the gearbox oil after the first 500 km (312 miles) and then every 8000 km (5000 miles) (*), see (CHANGING THE GEARBOX OIL AND THE ENGINE OIL FILTER).
2 STROKE OIL
CAUTION
2 stroke oil can cause serious skin damage if handled on a daily basis over a long period of time.
You are advised to wash your hands thoroughly after handling the oil.
Do not dispose of the oil in drains, water courses or the soil.
Take the oil to (or have it collected by) the nearest used oil disposal agency or the supplier.
You are advised to wear rubber gloves when carrying out maintenance work.
BRAKE FLUID
NOTE This motorcycle has front and rear disc brakes, with separate hydraulic circuits.
The following information refers to a single braking system, but is applicable to both.
CAUTION
Brake fluid can cause irritation if it comes into contact with the skin or eyes.
Thoroughly wash any parts of the body that come into contact with the fluid and contact an eye specialist
or doctor if the fluid comes into contact with the eyes.
DO NOT DISPOSE OF THE FLUID IN DRAINS, WATER COURSES OR THE SOIL.
KEEP OUT OF REACH OF CHILDREN.
Avoid splashing brake fluid on the plastic or painted parts of the motorcycle, as it will cause damage.
Check the brake fluid level every 4000 km (2500 miles), (CHECKING AND TOPPING UP THE FRONT BRAKE
FLUID) and (CHECKING AND TOPPING UP THE REAR BRAKE FLUID); change the fluid every year,
(CHANGING THE FRONT BRAKE FLUID) and (CHANGING THE REAR BRAKE FLUID).
1-8
Release 00
2001-03
ch. 1
General information
RS 50
WARNING
Do not use fluids other than those specified and do not top up with different fluids, as this will damage the
braking system.
Do not use fluids that have been stored in old containers or that have been open for a long time.
Sudden variations in the play or looseness of the brake levers are caused by problems in the hydraulic
circuits.
Check very carefully to ensure that there is no oil or grease on the brake discs and friction gaskets, especially after servicing or inspections.
Check that the brake hoses are not twisted or worn.
Make sure no water or dust gets into the circuit accidentally.
You are advised to wear rubber gloves when working on the hydraulic circuit.
CARBON MONOXIDE
If a servicing operation has to be carried out with the engine running, make sure this is done in the open air or in a
well-ventilated area.
Never run the engine in enclosed spaces. If you have to work in an enclosed space, use an exhaust fume extraction system.
CAUTION
Exhaust fumes contain carbon monoxide, a poisonous gas that can cause loss of consciousness and
death.
Run the engine in the open air or, if you have to work in an enclosed space, use an exhaust fume extraction system.
COMPONENTS AT HIGH TEMPERATURES
CAUTION
The engine and the exhaust system components get very hot and stay hot for a certain time after the
engine has been switched off.
Wear heat-proof gloves if you have to handle these components, or else wait until the engine and exhaust
system have cooled down.
RUNNING-IN RULES
WARNING
After the motorcycle has been operated for 500 km (300 mi), perform the checking operation shown in the
column “After running-in” of the REGULAR SERVICE INTERVALS CHART.
Failure to heed this warning can lead to damage to your motorcycle, engine seizure or other malfunction which
could cause an upset and lead to serious injury or even death.
The internal parts of the engine and transmission must be properly run-in to ensure their long life and dependable
operation.
If possible, while breaking in your motorcycle, ride on hilly roads and/or roads with many curves so that the engine
and transmission undergo lots of speed changes. It is also important that, during the run-in period, the suspension
and brakes be treated gently to allow the mating parts to bed.
Therefore, avoid hard braking, high speeds or very bumpy roads during the break in period.
0- 100 km (0- 62 mi)
Apply the brakes gently, avoiding sudden or prolonged braking.
0- 300 km (0- 187 mi)
Open the throttle no more than one-half way for extended periods.
300- 500 km (187- 312 mi)
Open the throttle no more than three-quarters for extended periods.
ch. 1
Release 00
2001-03
1-9
1
General information
RS 50
POSITION OF THE WARNING ADHESIVE LABELS
1 2
6
3
5
4
16 9 10 11 12
15
1-10
14
7
8
13
Release 00
2001-03
ch. 1
General information
Ref.
RS 50
Description
Ref.
1
Description
9
1
2
10
3
11
WARNING!
4
Do not use any tire other than those recommended and approved by Aprilia.
Maintain proper tire inflation. So not use any tire with less than 1/8" (3mm)
tread remainig. Do not repair any tire, nor use a repaired tire. Do not ride your
motorcycle overloaded or with an unbalanced load. Failure to follow these
warnings can lead to an accident and serious injuries or death. Always ensure
that the chain is correctly adjusted. See owner's manual.
CHAIN TENSION WITH NO LOAD
Tires pressure
Front tire Rear tire
1.9
1.7
(24.65) (27.55)
1.8
2.1
(26.1) (30.45)
2.1
1.8
(26.1) (30.45)
5
Tires size
bar (psi)
25 35mm
12
Front tire
Pirelli Metzeler
Dunlop
{
90/80 - 17" 46S
90/80 - 17" 46P
Rear tire
Pirelli Metzeler
Dunlop
110/80 - 17" 57S
110/80 - 17" 57P
Exhaust pipe stamping.
13
6
WARNING!
COOLANT
14
USE ONLY FLUID FOR SEALED CIRCUITS.
USE ONLY ANTIFREEZEAND ANTICORROSIVE
WITHOUT NITRITE, ENSURING PROTECTION
AT -35°C AT LEAST.
15
7
16
8
Muffler stamping.
ch. 1
Release 00
2001-03
1-11
General information
RS 50
SPARE PARTS
If any parts have to be replaced, use only original aprilia spare parts.
aprilia original spare parts are high quality and have been designed and built specifically for aprilia motor cycles.
WARNING
The use of NON-original aprilia replacement parts may impair the motorcycle’s performance, and even can
cause lasting damage. Damage caused by the use of NON-original spare parts is not covered by the warranty.
TECHNICAL DATA
DIMENSIONS
Max. length
Max. length (with rear mudguard extension
Max. width
Max. height (to front fairing)
Seat height
Wheelbase
Min. ground clearance
1920 mm (75.6 in)
1985 mm (78.1 in)
675 mm (26.6 in)
1155 mm (45.5 in)
810 mm (31.9 in)
1280 mm (50.4 in)
170 mm (6.7 in)
115 Kg (253.5 lbs)
)
Curb weight
ENGINE
Type
one- cylinder, 2- stroke with laminar suction. Separate
lubrication with variable strength automatic mixer (1.0 3.0%).
1
49.75 cm3 (1.7 US fl oz)
40.3 mm / 39.0 mm (1.6 in / 1.5 in)
12 ± 0.5 : 1
electric
Number of cylinders
Total displacement
Bore / stroke
Compression ratio
Starting
Engine idling
rpm
Clutch
1,100 ± 100 giri/min (rpm)
multidisc in oil bath, with manual control on the left side of
the handlebar.
liquid-cooled
Cooling
CAPACITY
Fuel (reserve included)
Fuel reserve
Transmission oil
Coolant
2 stroke oil (reserve included)
2 stroke oil reserve
Front fork oil
Seats
Motorcycle max. load (driver+ luggage)
Motorcycle max. load (driver+ passenger+ luggage)
TRANSMISSION
Type
13 l (3.4 gal)
2.6 l / 0.69 gal (mechanical reserve)
820 cm3 (28 US fl oz)
0.9 l (0.24 gal) (50% water+50% antifreeze with ethylene glycol)
1.6 l (1.69 qt)
0.35 l ( 0.37 qt)
430 cm3 (14.5 US fl oz) (for each fork leg)
n° 1 (2 in countries where passenger can be carried)
105 Kg (231.5 lbs)
180 Kg / 396.8 lbs (in countries where passenger can be carried)
mechanical, 6 gears with foot control on the left side of the
engine
GEAR RATIOS
Ratio
Primary
Secondary
Final ratio
Total ratio
1 st 20/ 71 = 1 : 3.550
12 / 36 = 1: 3.000
12 / 47 = 1 : 3.916
1 : 41.712
CONTINUED 
1-12
Release 00
2001-03
ch. 1
General information
RS 50
GEAR RATIOS
Ratio 2º
Secondary
Total ratio
Ratio 3º
Secondary
Total ratio
Ratio 4º
Secondary
Total ratio
Ratio 5º
Secondary
Total ratio
Ratio 6º
Secondary
Total ratio
2 nd 16 / 33 = 1: 2.062
1:28.677
3 rd 19 / 29 = 1: 1.526
1:21.222
1
4 th 22 / 27 = 1: 1.227
1:17.064
5 th 24 / 25 = 1: 1.042
1:14.483
6 th 25 / 24 = 1: 0.960
1:13.348
CARBURETOR
Number
Model
1
DELLORTO SHA 14/12
FUEL SUPPLY
Fuel
Super-rated unleaded petrol (4-star
) or unleaded petrol with
minimum octane rating 95 (N.O.R.M.) and 85 (N.O.M.M.)
unleaded petrol in compliance with DIN 51 607, with
minimum octane rating 95 (N.O.R.M.) and 85 (N.O.M.M.)
Fuel
FRAME
Type
Rake
Trail
perimeter aluminum backbone
24°C (- 75°F)
102 mm (4 in)
SUSPENSIONS
Front
Wheel stroke
Rear
Wheel stroke
hydraulically operated telescopic fork
4.3 in (110 mm)
hydraulic adjustable mono- shock absorber
4.7 in (120 mm)
BRAKES
Front
Rear
disc brake - Ø 280 mm (Ø 11.02 in) - with hydraulic actuation
disc brake - Ø 220 mm (Ø 8.66 in) - with hydraulic actuation
WHEEL RIMS
Type
Front
Rear
light alloy
2.50 x 17”
3.00 x 17”
TIRES
Front
90/80 17” 46S; 90/80 17” 46P
110/80 17” 57S; 110/80 17” 57P
Rear
INFLATION PRESSURE FOR SOLO RIDER
170 kPa (24.6 Psi / 1.7 bar)
Front
Rear
190 kPa (27.5 Psi / 1.9 bar)
INFLATION PRESSURE FOR RIDER AND PASSENGER (in countries where passenger can be carried)
Front
180±10 kPa (1.8±0.1 bar / 26±1.45 Psi )
Rear
210±10 kPa (2.1±0.1 bar / 30.4±1.45 Psi)
IGNITION
Type
Spark advance
C.D.I.
20° ± 1° (68°F ± 34°F) before TDC
CONTINUED 
ch. 1
Release 00
2001-03
1-13
General information
RS 50
SPARK PLUG
Standard
Alternative
NGK R BR9ES
CHAMPION RN1C
NGK R BR8ES
0.6 - 0.7 mm (0.02 - 0.03 in)
Spark plug gap
ELECTRIC
Battery
Fuses
Generator
12 V - 4 Ah
7.5 A
12 V - 105 W
BULBS
Low beam
High beam
Parking light
Direction indicators
Rear parking light/ number/ plate light/ stoplight
Tachometer
Speedometer
Coolant temperature indicator
12 V - 35 W
12 V - 35 W
12 V - 5 W
12 V - 10 W
12 V - 5 / 21 W
12 V - 5 W
12 V - 3.4 W
12 V - 1.2 W
WARNING LIGHTS
Neutral
Right direction indicators
High beam
2 stroke oil reserve
Left direction indicators
Low beam
12 V - 1.7 W
12 V - 1.7 W
12 V - 1.7 W
12 V - 1.7 W
12 V - 1.7 W
12 V - 1.7 W
LUBRICANT CHART
Gearbox oil (recommended): F. C., SAE 75W - 90 or
GEAR SYNTH, SAE 75W - 90.
As an alternative to the recommended oil, it is possible to use high-quality oils with characteristics in compliance
with or superior to the A. P. I. GL- 4 specifications.
2 stroke oil (recommended): PRO GPX 2 or
2T FORMULA RACING.
As an alternative to the recommended oil, use high- quality oils with characteristics in compliance with or superior
to the ISO- L- ETC ++, A. P. I. TC ++ specifications.
Fork oil (recommended): F. A. 5W or F. A. 20W fork oil.;
As an alternative
FORK 5W or
FORK 20W.
To obtain an intermediate setting between the F. A. 5W and F. A. 20W or
20W levels, the products can be mixed in the proportions shown below:
SAE 10W =
SAE 15W =
FORK 5W and
FORK
F. A. 5W 67% of the volume + F. A. 20W 33% of the volume, or
FORK 5W 67% of the volume +
FORK 20W 33% of the volume;
F. A. 5W 33% of the volume + F. A. 20W 67% of the volume, or
FORK 5W 33% of the volume +
FORK 20W 67% of the volume.
Bearings and other lubrication points (recommended):
AUTOGREASE MP or
GREASE 30.
As an alternative to the recommended product, use high-quality grease for rolling bearings, working temperature
range -30° C.... +140° C (86°F…+ 284°F), dripping point 150° C... 230° C (302°F… 446°F), high protection against
corrosion, good resistance to water and oxidation.
Protection of the battery poles: neutral grease or vaseline.
Spray grease for chains (recommended): CHAIN SPRAY or
CHAIN LUBE.
WARNING
Use new brake fluid only. Use of used or contaminated brake fluid can lead to brake failure with subsequent accident, serious injury, or even death.
Brake fluid (recommended): F. F., DOT 5 (DOT 4 Compatible) or
BRAKE 5.1, DOT 5 (DOT 4 Compatible).
WARNING
Use only antifreeze and anticorrosive without nitrite, ensuring protection at least -35°C (-31°F).
Engine coolant (recommended): ECOBLU - 40°C (- 40°F) or
COOL.
Failure to use appropriate antifreeze, mixed with distilled water, as coolant, can lead to serious damage to the
motorcycle’s cooling system, which can cause engine seizure, and subsequent upset with serious injury or even death.
1-14
Release 00
2001-03
ch. 1
General information
RS 50
SPECIAL TOOLS
Special service tools must be used for removing and
fitting components correctly and for certain adjustments.
The special tools will avoid the damage that can occur
using unsuitable tools and/or improvised techniques.
Below is the list of service tools specially designed for
this specific motorcycle.
If necessary, ask for the general service tools (see
service tools manual).
2
1
WARNING
Consult the accompanying documentation (if any)
before using the special tools.
1
Name
of tool and function
Code
Pos.
8140204
1
Support pin for stand
8705021
2
Rear stand
8101945
3
Swing arm pin adjustment socket wrench
3
ch. 1
Release 00
2001-03
1-15
General information
RS 50
POSITIONING THE MOTORCYCLE ON THE REAR
SUPPORT STAND
3
Loosen the knob (1).
Remove the front fork support (2) from the stand.
Insert the support pin (3).
Repeat the previous operations on the opposite side
of the stand.
2
WARNING
1
Lift the motorcycle by grasping the two sides of
the swing arm only.
Support pin for stand: 8140204.
Insert the stand from the back of the motorcycle and
position it so that the two support pins (3) can be
located as follows:
the right support between the brake caliper and brake
line coupling on the swing arm (Pos. A);
the left support between the sprocket and chain (Pos.
B);
Slide the support pins (3) towards the motorcycle, so
that the bosses on the pins touch the swing arm (see
figure above).
Tighten the two knobs (1).
B
A
NOTE Have someone help you keep the motorcycle
in vertical position with the two wheels on the ground.
Rest one foot on the rear part of the stand (4).
Push the stand (4) downwards until it reaches the end
of its stroke (see figure).
Rear stand: 8705021.
4
1-16
Release 00
2001-03
ch. 1
General information
RS 50
GENERAL SPECIFICATIONS FOR
TORQUE WRENCH SETTINGS
The standard torque wrench settings for screws and
bolts with ISO metric thread are given in the table below.
Thread
screw or
bolt
Wrench
M6
10
Torque wrench
Nm (Ft-lb)
Kgm
6 (4.4)
0,6
M8
12
15 (11.1)
1,5
M10
14
30 (22.1)
3,0
M12
17
55 (40.5)
5,5
M14
19
85 (62.7)
8,5
M16
22
130 (95.9)
13,0
1
For the specific settings for the unions and couplings
on the motorcycle in question, see (FASTENERS).
Unless otherwise specified, the torque wrench settings refer to clean, dry threads at ambient temperature.
NOTE To avoid deforming the components, or
having a leaking joint, tighten the screws and bolts as
follows. First, screw in all the fastners by hand.
Second, snug each fastener to approximately one-half
of the specified torque setting, working in the diagonal
pattern as shown, (A), (B), (C), and (D). Finally, bring
each fastener up to its specified torque, working in the
same order.
A
C
D
B
NOTE When this procedure is followed, the clamping
pressure exerted by the fasteners will be uniformly
distributed over the surface of the joint.
ch. 1
Release 00
2001-03
1-17
General information
RS 50
ABBREVIATIONS / SYMBOLS / INITIALS
#
<
>
≤
≥
~
∞
°C
°F
±
a.c.
A
Ah
API
AT
bar
c.c.
cm3
CO
DIN
d.c.
giri/min
HC
ISC
kg
kgm
km
km/h
k
kPa
kW
1-18
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
number
less than
greater than
equal to or less than
equal to or greater than
approximately
infinity
degrees Centigrade
degrees Fahrenheit
plus or minus
alternating current
Ampere
Ampere-hour
American Petroleum Institute
high tension (HT)
unit of pressure (1 bar = 100 kPa)
direct current (d.c.)
cubic centimeters
carbon monoxide
Deutsche Industrie Norm
direct current
revolutions per minute (rpm)
unburnt hydrocarbons
idle speed control
kilograms
kilograms per meter (1 kgm = 10 Nm)
kilometers
kilometers per hour
kilohm
kiloPascal (1 kPa = 0.01 bar)
kilowatt
Release 00
l
LED
m/s
MAX
mbar
mi
MIN
MPH
Ω
MΩ
N.O.M.M.
N.O.R.M.
Nm
Ω
PICK-UP
PMI
PMS
rpm
SAE
TEST
T.C.E.I.
T.E.
T.P.
UPSIDEDOWN
V
W
Ø
2001-03
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
=
liters
light emitting diode
meters / second
maximum
millibar
mile
minimum
miles per hour
megaohm
“Motor” method octane rating
“Research” method octane rating
Newton-meter (1 Nm = 0.1 kgm)
ohm
pick-up
bottom dead center (BDC)
top dead center (TDC)
revolutions per minute
Society of Automotive Engineers
diagnostic check
hex socket screw
hex head screw
slotted head screw
=
=
=
=
Upside-down forks
Volts
Watts
diameter
ch. 1
Routine maintenance operations
RS 50
2
Routine maintenance
operations
ch. 2
Release 00
2001-03
2-1
Routine maintenance operations
RS 50
This section describes the routine maintenance
procedures for the main components of the motorcycle.
CAUTION
Before starting any maintenance or inspection job
on the motorcycle, stop the engine and remove
the key, and wait until the engine and exhaust
system have cooled down. Place the motorcycle
on a workstand, which is solidly attached to the
floor. Raise the motorcycle up to the point where it
may conveniently be worked on.
Use extreme caution when working around parts
of the engine and exhaust, or brakes, which may
remain hot for a long time.
Avoid the temptation to hold any part of the motorcycle in your mouth. Coatings and plainings
are used on many of the parts used in this motorcycle, which are poisonous.
Unless expressly stated otherwise, reassemble
the motorcycle in the reverse order from the
disassembly steps given in this manual.
2-2
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
SERVICING SCHEDULE
COMPONENT
u
u
c
c
c
c
u
u
u
c
c
u
u
c
u
c
u
c
u
c
c
u
u
c
Battery electrolyte level
Spark plug
Carburetor
Wheel balancing
Steering sleeve bearings and steering play
Wheel bearings
Air cleaner
Lights functioning / adjustment
Clutch play
Brake systems
Cooling system
Light system
Brake fluid
Brake fluid
Coolant
Coolant
2 stroke oil level
Exhaust pipe / muffler
Gearbox oil
Fork oil and seal
Piston and piston rings
Engine idling speed
Wheels / tires and inflation pressure
Wheels / tires and inflation
pressure
c Tightening nuts and bolts
c 2 stroke oil reserve warning light
End of running-in
1000 km (625 mi)
C
P
c
c
c
c
c
Clutch wear
Rear shock absorber
Brake discs
Transmission and control cables
Motorcycle general working order
C
C
S
P
C
C
C
C
C
P
C
R
R
C
C
C
C
C
C
C
every 2 years: S
every 2000 km (1250 mi):C
every 2 years: S
every 500 km (312 mi): C
P
S
C
S
every 12000 km (7500 mi): S
After first 8000 km (5000 mi): C / every 16000 km (10000 mi): S
R
C
every month: C
C
C
C
C
u Drive chain tension and
lubrication
c Final drive (chain, ring gear,
sprocket)
c Fuel lines
c 2 stroke oil pipes / hoses
u Front and rear brake pad
wear
every 4000 km
every 8000 km
(2500 mi) or 12 months (5000 mi) or 24 months
C
C
every 500 km (312 mi):
C
C
C
C
C
every 2000 km (1250 mi):
C
every 4 years: S
every 4 years: S
C
C
C
C
C
C
C
C
C = check and clean, adjust, lubricate or replace if necessary; P = clean; S = replace; R = adjust.
Service the motorcycle more frequently if it is used in rainy or dusty areas or on rough roads.
Servicing of items marked (c) should be done ONLY by an authorized aprilia dealer.
u = user
c = dealer
ch. 2
Release 00
2001-03
2-3
2
Routine maintenance operations
RS 50
LUBRICATION POINTS
KEY TO LUBRICATION DIAGRAM
Regular, lubrication, using the correct lubricants, is an
important factor in ensuring the long life and excellent
performance of the motorcycle.
1) Throttle control
2) Throttle cable
3) Brake lever pin
4) Tachometer cable
5) Tachometer drive
6) Mounting pin
7) Brake pedal pins
8) Steering bearings
9) Clutch lever pin
10) Drive chain
11) Shift lever pins
12) Shift lever pins
13) Side stand pin
IMPORTANT Before lubricating any part of the
motorcycle, clean any rust, dirt, or dust from the part
which is to be lubricated. Any exposed parts subject to
rusting, must be lubricated with engine oil or grease
(see LUBRICANT CHART).
The “LUBRICATION DIAGRAM” shows the lubrication
points.
■ = Grease
▲ = Oil
LUBRICATION DIAGRAM
1
2
3
4
5
7
6
9
8
10
12
2-4
Release 00
13
2001-03
11
ch. 2
Routine maintenance operations
RS 50
ARRANGEMENT OF THE INSTRUMENTS /
CONTROLS
7
8
6
KEY
1) Ignition switch/ steering lock ( - - )
2) Turn signal switch ( )
3) Horn push button ( )
4) Dimmer switch ( - )
5) High beam signalling push button ( )
6) Clutch lever
7) Instruments and indicators
8) Front brake lever
9) Throttle grip
10) Start push button ( )
11) Light switch ( - •) (not present )
12) Engine stop switch ( - )
(in countries where installed)
INSTRUMENTS AND INDICATORS
KEY
1) Tachometer
2) Coolant temperature indicator ( )
3) Right turn signal ( ) (*)
4) Green neutral indicator warning light ( )
5) Red 2 stroke oil reserve warning light ( )
6) Blue high beam warning light ( )
7) Green low beam warning light ( )
8) Left turn signal ( ) (*)
9) Trip odometer
10) Odometer reset
11) Total miles odometer
12) Speedometer
1
9
5
12
11
4
3
2
10
1
2
12
11
10
9
8
7
6
5 4
3
(*) The turn signal lights are yellow.
ch. 2
2
Release 00
2001-03
2-5
Routine maintenance operations
RS 50
BATTERY
Read carefully (GENERAL PRECAUTIONS AND
INFORMATION).
Two types of batteries are sold for motorcycles:
conventional, which has a removable cap on each
cell, and maintenance free, which has no removable
caps and cannot be inspected.
CAUTION
This motorcycle is equipped with a conventional
type battery. Do not replace it with a maintenance
free battery. Doing so will damage the electrical
system and could lead to a dangerous explosion.
Check the electrolyte level and the tightness of the
terminals after the first 500 km (312 mi) and thereafter
every 4,000 km (2,500 mi) or 8 months.
WARNING
Batteries, when charged, give off hydrogen gas,
which is highly explosive. Therefore, do not smoke
while working on or around the battery, and keep
naked flames or sparks away from the battery.
Keep gasoline and other flammable substances well
away from the battery, since a battery spark could
easily ignite them and cause a devastating fire.
Battery electrolyte is toxic and caustic and can
severely burn your eyes or skin. Always wear tight
fitting goggles and protective clothing when handling battery electrolyte. It is particularly important
for you to protect your eyes since even a minuscule
amount of battery acid could destroy your vision.
Should you accidentally get even the smallest
amount of battery electrolyte on your skin or eyes,
immediately flush with large quantities of clear cool
water and immediately seek professional
medical attention.
If someone should accidentally swallow battery
electrolyte, drink a large quantity of milk or cool
clear water and continue with milk of magnesia or
vegetable oil. Seek professional medical assistance immediately.
Since the battery gives off explosive hydrogen gas,
especially when it is being charged, when you are
charging a battery, make sure that the room is
properly ventilated. Do not inhale the gases released during charging. Do not permit any open
flames, sparks or cigarettes or any other source of
heat anywhere near the battery while it is charging.
Do not tip the motorcycle too much, or tip the
battery too much, to avoid electrolyte leaking out.
Should you accidentally spill battery electrolyte on
any part of your motorcycle, immediately wash it
off with lots of cool clear water.
Spills may be neutralized with a mixture of baking
soda and water, as well. This is particularly important, as the battery electrolyte will severely corrode
metallic parts and destroy the finish of plastic and
painted parts.
1
CAUTION
Never switch the battery cables. Observe the
proper polarity of the battery. Incorrectly attaching
the battery to your motorcycle will irreparably
destroy the electrical system of your motorcycle.
Connect and disconnect the battery only with the
ignition switch (1) in the “ ” (OFF) position.
First connect the positive cable (+), then the
negative (–). Disconnect the negative cable (–)
first, then the positive (+).
2-6
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
If your battery needs to be charged, use a constant voltage, or “taper” charger, with a current
rating no greater than 1/10th the capacity of the
battery (i. e., for a 50 amp hour battery, the maximum charging current should be 5 amps).
Use of a more powerful charger can not only
damage the battery irreparably, but could cause it
to overheat and explode.
If your battery is equipped with an overflow tube,
always ensure that it is properly installed, and
properly routed. Failure to adhere to this instruction can cause corrosive fumes from the battery to
cause serious damage to your motorcycle.
2
NOTE Check the battery voltage with a portable
tester. If the voltage reading is less than 12V, the
battery needs recharging.
CHECKING AND CLEANING THE TERMINALS
Read carefully (BATTERY).
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Make sure that the cable terminals (1) and the battery
terminals (2) are:
in good conditions (and not corroded or covered with
deposits);
covered with neutral grease or Vaseline.
If it is necessary to clean the battery terminals:
Make sure that the ignition switch (3) is in “ ” (OFF)
position.
Disconnect first the negative (–) and then the positive
cable (+).
Brush with a wire brush to eliminate any sign of
corrosion.
Reconnect first the positive (+) and then the negative
cable (–).
Cover the terminals of the cables and of the battery
with neutral grease or Vaseline.
1
2
3
REMOVING THE BATTERY
Make sure that the ignition switch (3) is in “ ” (OFF)
position.
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Release the rubber band (4) from the couplings (5) and
(6) and take it.
Disconnect first the negative (–) and then the positive
cable (+). Remove the battery breather pipe (7). Remove
the battery from its compartment and put it on a flat
surface, in a cool and dry place.
4
6
WARNING
Once it has been removed, the battery must be stored
in a safe place. Ensure that children cannot find it; the
slightest bit of battery acid spilled on the skin, eyes, or
ingested can cause serious injury or even death.
ch. 2
7
5
Release 00
2001-03
2-7
Routine maintenance operations
RS 50
CHECKING THE ELECTROLYTE LEVEL
Read carefully (BATTERY).
To check the electrolyte level, proceed as follows:
Remove the battery (REMOVING THE BATTERY).
Make sure that the fluid level falls between the “MIN”
and “MAX” notches stamped on the side of the battery.
MAX
MIN
If it does not:
Remove the battery plugs.
CAUTION
Top up with distilled water only. Do not exceed the
“MAX” mark, since the electrolyte level increases
during the recharge.
Top up by adding distilled water.
RECHARGING THE BATTERY
Remove the battery, see (REMOVING THE BATTERY).
Remove the battery plugs.
WARNING
The battery gives off noxious and explosive
gases; keep it away from flames, sparks, cigarettes and any other sources of heat. During the
recharging or the use, make sure that the room is
properly ventilated and avoid inhaling the gases
released.
Check the electrolyte level, see (CHECKING THE
ELECTROLYTE LEVEL).
Connect the battery charger to the battery.
Charge the battery using a battery charger with a
current capacity of no greater than 1/10th the capacity
of the battery.
After the battery is fully charged, check the electrolyte
level again and if necessary top up with distilled water.
Replace the battery plugs.
Recharging
Normal
Fast
Voltage
(Amps)
Time
(hours)
1.2
12
8 - 10
0.5
CAUTION
Do not replace the battery plugs until 10 minutes
after disconnecting the charger, since the battery
continues to produce gas after the charger is
removed.
2-8
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
INSTALLING THE BATTERY
Make sure that the ignition switch (1) is in the OFF
position.
Remove the rider saddle see (REMOVING THE
RIDER SADDLE).
Install the battery in the battery box.
Connect the battery breather tube.
1
CAUTION
2
Reconnect the battery breather tube (see BATTERY).
Connect, in order, the positive (+) and negative (-)
cable.
Cover the terminals of the cables and of the battery
with neutral grease or Vaseline.
NOTE First hook the rubber strap into the lower hook
(2) and then, into the upper hook (3).
3
Replace the rubber over the hook, taking care to
position it correctly.
Replace the rider saddle, see (REMOVING THE
RIDER SADDLE).
2
LONG PERIOD OF BATTERY NON-USE
If your motorcycle remains unused for more than a couple of
weeks, it will be necessary to “trickle charge” the battery, to
prevent battery damage, see (RECHARGING THE BATTERY). Remove the battery, see beside (REMOVING THE
BATTERY), and put it in a cool, dry place.
The best way to prevent battery deterioration is to constantly leave a “trickle” charger with a capacity of about 1/
10th amp, attached. These chargers are very economically
available from your Local aprilia Dealer, and will ensure
that your battery always remains in tip top condition. If this
cannot be done, charge the battery for about 30 minutes
using a battery charger with a current capacity of no
greater than 1/10th the capacity of the battery, see (RECHARGING THE BATTERY).
SPARK PLUG
Read carefully (MAINTENANCE).
Clean the spark plug after the first 500 km (312 mi)
and thereafter every 4,000 km (2,500 mi); change it
every 8,000 km (5,000 mi).
Periodically remove the spark plug and clean it carefully, removing carbon deposits; change it if necessary.
To reach the spark plug:
Remove the fuel tank (REMOVING THE FUEL TANK).
ch. 2
Release 00
2001-03
2-9
Routine maintenance operations
RS 50
To remove and clean the spark plug:
WARNING
Before carrying out the following operations, let
the engine and the exhaust silencer cool down
until they reach room temperature, in order to
avoid burns.
Remove the spark plug cap (1). Using compressed air,
blow all the dirt away from the base of the spark plug.
Using the special spark plug wrench from the tool kit,
unscrew the spark plug. Make sure that no dirt falls into
the cylinder through the spark plug hole. Inspect the
spark plug, and insure that there are no carbon deposits nor corrosion marks on either electrode or the
ceramic nose that surrounds the center electrode.
If necessary, clean the spark plug with a proprietary
spark plug cleaner, and a stainless steel brush. Using
compressed air, carefully blow out the spark plug after
you have cleaned it.
Inspect for cracks on the insulating material, electrode
corrosion or erosion, or deposits that you cannot
remove. If the spark plug shows any of these defects,
it must be replaced.
Check the spark plug gap with a thickness gauge.
The gap must be 0.6 - 0.7 mm (0.024 - 0.028 in); if
necessary adjust it, carefully bending the ground
(outside) electrode.
Make sure the gasket is in good condition. With the
gasket on, screw the spark plug into the head by hand.
1
0,6 ÷ 0,7 mm
(0.024 ÷ 0.026 in)
Tighten the spark plug with the spark plug wrench,
approximately one-half turn after it first snugly contacts the cylinder head.
CAUTION
If the spark plug is new, it should be screwed in,
unscrewed again, then tightened to the specified
torque.
Spark plug tightening torque:
14.8 Ft-lb (2 kgm) [20 Nm].
CAUTION
The spark plug must be well tightened, otherwise
the engine may overheat and be seriously damaged.
Use the recommended type of spark plug only
(TECHNICAL DATA), in order not to compromise
the life and performance of the engine.
Position the spark plug cap properly, so that it does
not come off due to the vibrations of the engine.
Replace the fuel tank.
SPARK PLUG Standard .............. NGK R BR9ES
Alternative ............ CHAMPION RN1C
........... NGK R BR8ES
2-10
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
AIR CLEANER
WARNING
Do not use gasoline or flammable solvents to
wash the air cleaner, in order to avoid fire or
explosion.
Read carefully (MAINTENANCE).
2
Check the condition of the air cleaner and clean it
monthly or every 4,000 km (2,500 mi) depending on
the conditions in which the motorcycle is used.
If the motorcycle is used on dusty or wet roads, the
cleaning operations and any replacement should be
carried out more frequently.
Before the cleaning operation, it is necessary to
remove the air cleaner from the motorcycle.
REMOVAL
Remove the fuel tank (REMOVING THE FUEL TANK).
Unscrew and remove the screw (1).
Unscrew and remove the six screws (2).
Remove the filter case cover (3).
Remove the filter element (4).
Remove the grid (5).
2
1
2
2
3
4
CAUTION
Plug the opening with a clean cloth to prevent any
foreign matter from entering the air tubes.
5
CLEANING
To clean the filter element (4), rinse it in non- flammable solvent, then allow it to dry thoroughly.
Sparingly apply filter oil, or heavy engine oil (SAE
80W- 90), then squeeze the filter to eliminate any
excess oil.
NOTE The filter must be completely wet with oil, but
not dripping.
ch. 2
Release 00
2001-03
2-11
Routine maintenance operations
RS 50
ADJUSTING THE THROTTLE CONTROL
Read carefully (SERVICING SCHEDULE).
WARNING
If the throttle sticks open, you will lose control of your
motorcycle and a serious accident could result.
If any fastener in the throttle system becomes loose,
likewise you will lose control of your motorcycle.
Either situation can lead to an upset or collision with
subsequent serious injury or death.
The play of the throttle cable must be between 2 - 3
mm (0.08 - 0.12 in), measured at the edge of the grip,
see the illustration above. To adjust the cable:
Position the motorcycle on the stand.
Pull back the rubber boot (1).
Loosen the lock nut (2).
Rotate the adjuster (3) in such a way as to restore the
prescribed value.
After the adjustment, tighten the lock nut (2) and check
the play again. Replace the rubber boot (1).
2
3
WARNING
Exhaust gases contain carbon monoxide, which is
extremely poisonous if inhaled. Do not start the
engine in closed or badly-ventilated rooms. Failure
to observe this warning may cause loss of consciousness or even lead to death by asphyxia.
After you have adjusted the throttle, rotate the
handlebars full left and full right with the engine
idling. Check to ensure that the idle sound is not
affected by this. Also check that the throttle
smoothly and fully closes when released.
Failure to observe this warning can lead to an
accident with subsequent injury or even death.
IDLING ADJUSTMENT
Read carefully (SERVICING SCHEDULE).
4
If the idle becomes irregular, too fast, or too slow, it
must be adjusted.
To adjust the idle:
WARNING
Exhaust gases contain carbon monoxide, which is
extremely poisonous if inhaled.
Do not start the engine in closed or badly-ventilated rooms.
Failure to observe this warning may cause loss of
consciousness or even lead to death by asphyxia.
Ride for a few miles until the engine reaches normal
running temperature, (Coolant temperature indicator “ ”).
Put the shift lever (4) in neutral so that the green “ ”
light is on.
Observe the tachometer.
The engine must idle between 1,100 ± 100 rpm.
If it does not:
Position the motorcycle on the stand.
Remove the rubber plug (5) (right fairing).
Insert a flat-tip screwdriver in the hole and adjust the
screw (6) on the carburetor.
By SCREWING IT clockwise, you increase the engine
rpm.
By UNSCREWING IT counterclockwise, you decrease
the engine rpm.
Twist the throttle grip, accelerating and decelerating a
few times to make sure that it functions correctly and
to check if the idling speed is constant.
2-12
Release 00
2001-03
6
5
ch. 2
1
Routine maintenance operations
RS 50
CARBURETOR CONTROLS
COLD START LEVER
The cold start lever (1) is located on the right side of
the carburetor. It can be reached from above through
the opening between the fairing and the frame.
To operate the cold start lever, push the lever downward.
2
When the engine is warmed up, before you ride away,
while holding at least one brake, engage neutral (the
green neutral light will illuminate). Allow the engine to
warm up throughly.
CAUTION
Do not attempt to disengage the cold start lever
(1) by hand. It automatically returns to its initial
proper position when the throttle grip (2) is
twisted.
Do not ride away with the cold start lever (1)
pushed downward. For the first few moments, do
not accelerate hard. Allow the engine to thoroughly warm up before you demand full performance.
1
Rotating the throttle grip (2) completely counterclockwise (open), quickly, and releasing it immediately, will
disengage the cold start lever.
You will hear a metallic snap which signals that the
cold start lever (1) has returned to its disengaged
position.
A
2
CHECKING THE GEARBOX OIL
Read carefully (GEARBOX OIL) and (SERVICING
SCHEDULE).
Check the gearbox oil level every 4,000 km (2,500
miles), change the oil after the first 500 km (312 miles)
and then every 8,000 km (5,000 miles), (CHANGING
THE GEARBOX OIL).
CHECKING
6
NOTE Position the motorcycle on solid, flat ground.
Stop the engine and leave it to cool down for at least
ten minutes, to allow the oil to drain down into the
sump and cool down.
Remove the right-hand side fairing see (REMOVING
THE SIDE FAIRINGS).
Unscrew and remove the check screw (3).
Take out the seal washer (4).
5
ch. 2
Release 00
2001-03
4
3
2-13
Routine maintenance operations
RS 50
CAUTION
Danger of falling or turning over.
As soon as the motorcycle is stood up, i.e. moved
from the park position to the riding position, the
stand retracts automatically.
Keep the motorcycle in the vertical position with both
wheels on the ground.
NOTE If you attempt to check the oil with the motorcycle leaned in either direction from the vertical, your
measurement will be inaccurate.
Visually check to ensure that the oil level is at or
above the lower edge of the threaded hole (3).
If it is:
Inspect the gasket (2). Replace if damaged.
Install and tighten the screw (1).
If it is not:
Top up the oil per the following paragraph.
4
TOPPING UP
If it is necessary to top up the transmission:
Unscrew and remove the filler cap (4).
Pour a small quantity of oil and wait about one minute
to allow the oil to flow into the transmission.
Check the oil level as described above.
Repeat this operation until the oil level is at or slightly
above the edge of the threaded hole (3). Follow the
screw installation instructions above.
3
2
WARNING
Tighten the filler screw snugly, to ensure that it
does not leak. Regularly check the transmission
cover gasket to ensure that it is not leaking.
Never ride the motorcycle with low transmission
oil or with contaminated or unapproved lubricants. This will greatly accelerate the wear of
moving parts, and cause irreparable failure.
It also could lead to a seizure, with subsequent
crash and serious injury, or even death.
2-14
Release 00
2001-03
ch. 2
1
Routine maintenance operations
RS 50
CHANGING THE GEARBOX OIL
Read carefully (GEARBOX OIL) and (SERVICING
SCHEDULE).
Check the gearbox oil level every 4,000 km (2,500
miles), change the oil after the first 500 km (312 miles)
and then every 8,000 km (5,000 miles).
2
REPLACEMENT
Start the engine (see STARTING) and keep it idling
for a few minutes, to allow the oil to run out in the
subsequent drainage stage.
NOTE Position the motorcycle on solid, flat ground.
Stop the engine and leave it to cool down for at least
ten minutes, to allow the oil to drain down into the
sump and cool down.
CAUTION
The engine, when hot, contains oil at a high
temperature: proceed with great care to avoid
burns in the subsequent operations.
Remove the right-hand side fairing see (REMOVING
THE SIDE FAIRINGS).
Remove the exhaust pipe, see (REMOVING THE
EXHAUST PIPE).
CAUTION
Danger of falling or turning over.
As soon as the motorcycle is stood up, i.e. moved
from the park position to the riding position, the
stand retracts automatically.
ch. 2
Release 00
2001-03
2-15
Routine maintenance operations
RS 50
Keep the motorcycle in a vertical position with the two
wheels on the ground.
Position a container (1) of capacity greater than 900
cm3 (30 US fl oz) under the drain plug (2).
Unscrew and remove the drain plug (2).
Unscrew and remove the filler plug (3).
Drain off the oil into the container (1), allowing it to
drip down for a few minutes.
Remove the metal residue from the magnet on the
drain plug (2).
Check the state of the drain plug washer (2), replacing
it if necessary.
3
4
2
1
Screw in and tighten up the drain plug (2).
Drain plug (2) torque wrench setting:
27 Nm (2.7 kgm) [19.9 Ft-lb].
Pour about 820 cm3 (28 US fl oz) of gearbox oil into
the filler hole (4), see (LUBRICANT CHART).
Screw in the filler plug (3).
Start the engine see (STARTING) and keep it idling for
about one minute to allow the gearbox oil circuit to fill
up.
Check the oil level, topping up if necessary see
(CHECKING AND TOPPING UP THE GEARBOX OIL
LEVEL).
WARNING
Tighten the filler screw snugly, to ensure that it
does not leak. Regularly check the transmission
cover gasket to ensure that it is not leaking.
Never ride the motorcycle with low transmission
oil or with contaminated or unapproved lubricants. This will greatly accelerate the wear of
moving parts, and cause irreparable failure.
It also could lead to a seizure, with subsequent
crash and serious injury, or even death.
2-16
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
2 STROKE OIL TANK
Top up the 2 stroke oil tank every 500 km (312 mi).
The motorcycle is provided with a separate mixer that
ensures the mixing of petrol and oil for the engine
lubrication (LUBRICANT CHART).
When the oil level in the 2 stroke oil tank is so low that
the reserve is being used, the 2 stroke oil reserve
warning light “ ” (1) located on the dashboard, will
illuminate (INSTRUMENTS AND INDICATORS).
2
WARNING
If the 2 stroke oil supply is exhausted, the engine
will seize. This can cause an upset with consequent risk of serious injury or even death. It
certainly will destroy your engine.
WARNING
Do not run your engine, even for a moment, without adequate 2 stroke oil in the 2 stroke oil tank.
This will cause serious damage to the engine.
If the oil in the 2 stroke oil tank ever runs dry, or if
the 2 stroke oil tube is removed, then the circuit
must be bled.
This operation must be carried out before further
running, since running the engine with air in the 2
stroke oil system will result in serious damage to
the engine, an engine seizure, a possible accident, with subsequent serious injury or death.
To fill the 2 stroke oil tank:
Remove the rider saddle, see (REMOVING THE
RIDER SADDLE). Remove the filler cap (1).
Using a funnel, fill the tank to the appropriate level
with 2 stroke oil.
TANK CAPACITY: 1.6 l (1.69 qt)
Replace the filler cap (1), ensuring that it is properly
sealed. Replace the rider saddle.
1
WARNING
Wash your hands thoroughly after handling the
oil. Do not dispose of the oil in drains, water
courses or the soil.
KEEP OUT OF REACH OF CHILDREN.
REMOVING THE OIL FROM THE 2 STROKE OIL
TANK
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rider and passenger saddle (REMOVING
THE RIDER AND PASSENGER SADDLE).
Remove the right-hand side fairing (REMOVING THE
SIDE FAIRINGS).
Keep the motorcycle in the vertical position with the
rear stand .
ch. 2
Release 00
2001-03
2-17
Routine maintenance operations
RS 50
Remove the two screws (1) shown in the figure and
take off the oil pump cover.
1
Get a container of capacity greater than 2 l (1.1 gal).
3
Remove the clamp (2) then detach the oil inlet tube
(3), allowing all the oil to flow out of the tank into the
container.
2
After emptying the tank, reconnect the oil inlet tube (3)
and secure it with the clamp (2).
Refit the oil pump cover and screw it on with the
screws (1).
Torque setting for screws (1):
4 Nm (0.4 Kgm) [2.9 Ft-lb].
WARNING
Wash your hands thoroughly after handling the
oil. Do not dispose of the oil in drains, water
courses or the soil.
KEEP OUT OF REACH OF CHILDREN.
COOLANT
CAUTION
Do not use the motorcycle if the coolant is below
the minimum prescribed level.
Check the coolant level every 2,000 km(1,250 mi) and
after long trips; change it every 24 months.
2-18
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
WARNING
Coolant is poisonous! Do not ingest coolant under
any circumstance.
Should you get coolant in your mouth, rinse with
cool water and immediately seek medical attention. Coolant is also very dangerous to your skin
and eyes. Should you accidentally get coolant on
your clothing or skin, change clothes immediately.
Wash coolant from your skin with hot water and
soap. Should you get coolant in your eyes, flush
with plenty of cool water and seek professional
medical help at once. Should someone swallow
coolant accidentally, induce vomiting, rinse mouth
with water, and immediately seek professional
medical attention.
2
DISPOSE OF THE COOLANT PROPERLY.
BE SURE TO KEEP THE DRAINED COOLANT
AWAY FROM CHILDREN AND PETS. IT IS SWEET
TASTING, AS WELL AS EXTREMELY POISONOUS,
AND IS VERY ATTRACTIVE TO CHILDREN AND
PETS.
Use extra caution not to spill the coolant on any
hot parts of the engine. It is flammable, and can
emit invisible, noxious fumes.
Always wear rubber or latex gloves when servicing the cooling system.
The coolant is composed of 50% distilled water and
50% nitrite-free antifreeze. This mixture is optium for
all temperatures down to -35°C.
This mixture of antifreeze and distilled water should
be used year-round, winter and summer, since evaporative losses are thus minimized and excellent corrosion protection is provided.
CAUTION
Never use tap water in the cooling system. Use
only distilled water. This will minimize the deposition of minerals in the radiator, as coolant evaporates, and minimize also the reduction in the
efficiency of the cooling system, which occurs
when hard, mineral laden water is used.
If your motorcycle is used at temperatures below
freezing, check the coolant often. If it is used at
temperatures below -35°C, increase the proportion of
antifreeze in the coolant as instructed by the antifreeze manufacturer, up to a maximum of 60% (40%
water).
1
WARNING
Never remove the cap (1) when the engine is even
warm, since the coolant is under high pressure
and is very hot. If it splashes out and contacts
your skin or clothing, it will cause severe burns.
ch. 2
Release 00
2001-03
2-19
Routine maintenance operations
RS 50
CHECKING AND TOPPING UP
WARNING
Never remove the cap (1) when the engine is even
warm, since the coolant is under high pressure and
is very hot. If it splashes out and contacts your skin
or clothing, it will cause severe burns.
Stop the engine and wait until it has cooled down.
NOTE Position the motorcycle on firm and flat ground.
WARNING
The side stand retracts automatically when the
motorcycle is picked up from its leaned over position
on the side stand. Be careful not to let the bike fall
over when you lift the bike up to perform this check.
1
Keep the motorcycle in a vertical position, with the two
wheels resting on the ground.
Loosen the filler cap (1) (by giving it two counterclockwise turns), without removing it.
Wait a few seconds in order to release any residual
pressure that may be present in the circuit.
2
NOTE The cap is equipped with a breather tube (2).
Do not disconnect the breather tube (2).
1
Unscrew and remove the filler cap (1).
WARNING
Coolant is poisonous! Do not ingest coolant under
any circumstance. Should you get coolant in your
mouth, rinse with cool water and immediately
seek medical attention. Coolant is also very
dangerous to your skin and eyes. Should you
accidentally get coolant on your clothing or skin,
change clothes immediately. Wash coolant from your
skin with hot water and soap. Should you get coolant
in your eyes, flush with plenty of cool water and seek
professional medical help at once. Should someone
swallow coolant accidentally, induce vomiting, rinse
mouth with water, and immediately seek professional
medical attention. Do not use your fingers or any
other object to check if there is enough coolant.
The coolant filler (1) neck has a smaller diameter ring
(3) that indicates the proper coolant level. Visually
check the coolant level against this ring.
2
If it is not:
Top up with coolant, see (LUBRICANT CHART) until
the coolant level reaches the ring (3). Do not exceed
this level, otherwise the coolant will flow out while the
engine is running.
1
Replace the filler cap (1).
CAUTION
If there is excessive coolant consumption or if the
expansion tank empties, check that there are no
leaks in the circuit.
2-20
Release 00
2001-03
3
ch. 2
Routine maintenance operations
RS 50
CHANGING THE COOLANT
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (COOLANT).
Change the coolant every two years.
Remove the right-hand side fairing (REMOVING THE
SIDE FAIRINGS).
Place a container under the drain plug (1) to collect
the fluid (capacity greater than 1 l / 0.26 gal).
Unscrew and remove the drain plug (1) and take off
the copper washer.
2
1
WARNING
Do not remove the filler cap (2) when the engine is
hot, as the coolant is under pressure and at a high
temperature.
Remove the filler cap (2) to allow the fluid to flow out
more quickly (2).
Wait until the coolant has all drained out.
2
DO NOT DISPOSE OF THE FLUID IN DRAINS,
WATER COURSES OR THE SOIL.
Replace the drain plug (1), using a new copper washer.
Drain plug (1) torque setting:
6 Nm (0.6 Kgm) [4.4 Ft-lb].
3
Fill the filler hole (3) right to the brim.
Squeeze and release the hoses (4) several times by
hand to create a slight pressure to allow the fluid to
flow into the tubing.
Top up again.
NOTE The fluid is at the right level when it settles
just below the brim of the filler hole (3).
Screw on the filler cap (2).
Start the engine and run it for a few minutes, allow it
to cool down and then recheck-the fluid level.
Top up if necessary (CHECKING AND TOPPING UP).
Total quantity: 0.9 l (0.24 gal)
NOTE There is no need to bleed the air from the
system on this motorcycle.
For further information see COOLING SYSTEM.
ch. 2
Release 00
2001-03
2-21
Routine maintenance operations
RS 50
CHECKING AND TOPPING UP THE
BRAKE FLUID
NOTE This motorcycle is equipped with
front and rear disc brakes with separate hydraulic
systems.
The following information may refer to just one braking
system but should be observed with regard to both brakes.
WARNING
Sudden variations in the play or looseness of the
brake lever are caused by problems in the hydraulic circuits.
Make sure the brake discs are not worn or greasy,
especially after servicing or checking the brakes.
Make sure that the brake lines are not twisted,
kinked or damage in any way.
Take care not to allow water or dust to get into the
circuit accidentally.
You are advised to wear rubber gloves when
servicing the hydraulic circuit.
Brake fluid can cause irritation if it comes into
contact with the skin or eyes.
Thoroughly wash any parts of the body that come
into contact with the fluid and contact an eye
specialist or doctor if the fluid comes into contact
with the eyes.
DO NOT DISPOSE OF BRAKE FLUID IN THE
ENVIRONMENT. KEEP BRAKE FLUID AWAY FROM
CHILDREN.
KEEP OUT OF REACH OF CHILDREN.
CAUTION
Avoid splashing brake fluid on the plastic or
painted parts of the motorcycle, as it will cause
damage.
CAUTION
The brakes are the most important guarantee of
safety on the motorcycle, and must be kept in a
perfect state of efficiency at all times.
Change the brake fluid once a year.
Use the type of brake fluid specified in the lubricant charts see (LUBRICANT CHART).
2-22
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
CAUTION
This motorcycle has front and rear hydraulic disc
brakes.
As the friction pads wear down, the fluid level decreases to compensate automatically for the wear.
The front brake fluid reservoir is situated on the right
handlebar, next to the front brake lever attachment.
2
The rear brake fluid reservoir is situated under the
upper fairing on the right-hand side of the motorcycle.
FRONT BRAKE
3
4
CHECKING THE SYSTEM
NOTE Carry out these checks only on a firm, flat
surface such as a concrete garage
floor.
Place the motorcycle on the stand.
Rotate the handlebars fully counterclockwise so that
the top surface of the brake
fluid in the front brake reservoir is parallel to the top
edge of the reservoir (1).
Ensure that the fluid level is up to the top of the glass
gauge (2). If not, top off.
5
2
1
TOPPING UP
WARNING
Danger of brake fluid spilling out. Do not pull the
brake lever when the screws (3) are slackened or,
above all, when the top of the brake fluid reservoir
is off.
Unscrew the two screws (3).
Remove the top (4).
NOTE Keep the fluid in the reservoir parallel to the
top edge of the reservoir; this will stop the dangerous
fluid from spilling out when topping up.
CAUTION
Do not expose the brake fluid to the air for long
periods.
Brake fluid is hygroscopic and absorbs moisture
on contact with the air.
Leave the brake fluid reservoir open ONLY the
minimum time necessary for topping up.
Remove the gasket (5).
ch. 2
Release 00
2001-03
2-23
Routine maintenance operations
RS 50
WARNING
Do not go over the “MAX” level when topping up.
Fill to the “MAX” level only when new pads are
fitted.
The fluid level decreases gradually as the pads
wear down.
Do not fill to the “MAX” level with worn pads, as
the fluid will spill out when the brake pads are
replaced with new ones.
NOTE The peep-hole (2) can be used as a reference
3
for filling to the “MAX” level: with the top edge of the
brake fluid reservoir parallel to the ground, fill until the
peep-hole (2) is completely covered by the fluid.
4
Fill the reservoir with brake fluid see (LUBRICANT
CHART) until the peep-hole is completely covered.
Replace the gasket (5) in its seating.
Replace the top (4).
Screw in and tighten up the two screws (3).
5
2
1
WARNING
Check the efficiency of the brakes.
If the brake lever has too much play or is too
loose, or if there are air bubbles in the circuit, then
the air may need to be bled out of the system.
2-24
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
REAR BRAKE
2
CHECKING THE SYSTEM
3
NOTE Carry out these checks only on a firm, flat
surface such as a concrete garage floor.
MAX
WARNING
The side stand retracts automatically when the
motorcycle is picked up from its leaned over
position on the stand.
Be careful not to let the bike fall over when you lift
the bike up to perform this check.
2
MIN
1
Maintain the motorcycle in a vertical position so that
the surface of the fluid in the rear brake reservoir (1) is
parallel to the top (2) edge of the reservoir.
Check that the fluid in the reservoir is above the “MIN”
mark.
If the fluid doesn’t reach the “MIN” mark, top up.
TOPPING UP
5
WARNING
Danger of brake fluid spilling out. Do not work
the rear brake lever when the fluid reservoir
cap is loosened or removed.
Unscrew and remove the cap (5).
6
MAX
MIN
CAUTION
4
Do not expose the brake fluid to the air for long
periods.
Brake fluid is hygroscopic and absorbs moisture on contact with the air.
Leave the brake fluid reservoir open ONLY the
minimum time necessary for topping up.
NOTE Keep the brake fluid parallel to the top
edge of the reservoir (horizontal position) when
topping up, to stop it spilling out.
Remove the gasket (6).
Using an oil syringe, fill the reservoir (4) with brake
fluid, see (LUBRICANT CHART) to the correct
level, i.e. between the “MIN” and “MAX” reference
marks.
ch. 2
Release 00
2001-03
2-25
Routine maintenance operations
RS 50
WARNING
Fill to the “MAX” level only when new pads are
fitted.
The fluid level decreases gradually as the pads
wear down.
Do not fill to the “MAX” level with worn pads, as
the fluid will spill out when the brake pads are
replaced with new ones.
To refit the components, follow the removal procedure
in reverse order.
CAUTION
Check the efficiency of the brakes.
If the brake lever has too much play or is too
loose, or if there are air bubbles in the circuit, then
the air may need to be bled out of the system.
CHANGING THE FRONT
BRAKE FLUID
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (BRAKE FLUID).
Change the front brake fluid every year.
WARNING
Handle the fluid with care: it reacts chemically with
the paintwork, plastic parts, rubber parts, etc.
DO NOT DISPOSE OF BRAKE FLUID IN THE
ENVIRONMENT.
Remove the protective rubber cap.
Fit one end of a transparent plastic tube over the
brake caliper bleed valve (1) and insert the other end
in a container to collect the fluid.
Slacken the bleed valve (1) about one turn.
1
NOTE Check that there is fluid in the reservoir
throughout the entire operation, otherwise the air will
have to be bled out of the circuit after changing the
fluid (BLEEDING THE BRAKE CIRCUITS).
2-26
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
Keep checking the fluid as it flows out of the reservoir
(2), and tighten up the bleed valve (1) before the
reservoir empties.
Top up the reservoir (2) see (CHECKING AND TOPPING UP THE BRAKE FLUID).
Slacken the bleed valve (1) again, about half a turn.
Check the fluid as it flows down the tube, and when
the color of the fluid changes (from darker to lighter)
tighten up the bleed valve (1) and remove the tube.
2
2
Refit the protective rubber cap.
Top up the fluid to the correct level in the reservoir (2)
see (CHECKING AND TOPPING UP THE BRAKE
FLUID).
CHANGING
THE REAR BRAKE FLUID
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (BRAKE FLUID).
Change the rear brake fluid every year.
WARNING
Handle the fluid with care: it reacts chemically
with the paintwork, plastic parts, rubber parts, etc.
DO NOT DISPOSE OF BRAKE FLUID IN THE
ENVIRONMENT.
Remove the protective rubber cap.
Fit one end of a transparent plastic tube over the
brake caliper bleed valve (1) and insert the other end
in a container to collect the fluid.
Slacken the bleed valve (1) about one turn.
NOTE Check that there is fluid in the reservoir
throughout the entire operation, otherwise the air will
have to be bled out of the circuit after changing the
fluid (BLEEDING THE BRAKE CIRCUITS).
1
ch. 2
Release 00
2001-03
2-27
Routine maintenance operations
RS 50
Keep checking the fluid as it flows out of the reservoir
(2), and tighten up the bleed valve (1) before the
reservoir empties.
Top up the reservoir (2) see (CHECKING AND TOPPING UP THE BRAKE FLUID).
Slacken the bleed valve (1) again, about half a turn.
Check the fluid as it flows down the tube, and when
the color of the fluid changes (from darker to lighter)
tighten up the bleed valve (1) and remove the tube.
1
Refit the protective rubber cap.
Top up the fluid to the correct level in the reservoir (2)
see (CHECKING AND TOPPING UP THE BRAKE
FLUID).
2
MAX
MIN
BLEEDING THE BRAKE CIRCUITS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (BRAKE FLUID).
Bleed the air from the system after the first 500 km
(312 miles).
If there is any air in the hydraulic system it acts as a
cushion, absorbing most of the pressure exerted on
the brake master cylinder and reducing the effectiveness of the brake calipers when braking.
Air in the system also give a “spongy” feel to the brake
lever and reduces the braking capacity.
WARNING
Handle the fluid with care: it reacts chemically
with the paintwork, plastic parts, rubber parts, etc.
DO NOT DISPOSE OF BRAKE FLUID IN THE
ENVIRONMENT.
2-28
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
CAUTION
Given the potential danger to the motorcycle and
rider, it is absolutely essential to bleed the air
from the hydraulic circuit after refitting the brakes
and setting up the system for normal use conditions.
To do this, proceed as follows:
2
Top up the reservoir with brake fluid see (CHECKING
AND TOPPING UP THE BRAKE FLUID).
Remove the protective rubber cap.
Fit one end of a transparent plastic tube over the
brake caliper bleed valve (1) and insert the other end
in a container to collect the fluid.
Pull and release the brake lever several times, then
keep it fully engaged.
Slacken the bleed valve 1/4 of a turn so that the brake
fluid runs into the container; this will take the tension
off the brake lever so that it pulls fully to its travel limit.
1
Tighten up the bleed valve (1), pump the brake lever a
few times, then keep it fully engaged and unscrew the
bleed screw again.
Keep repeating this operation until the fluid running
into the container is completely free of air bubbles.
NOTE Top up the reservoir with brake fluid whenever
necessary when bleeding the hydraulic system. Keep
checkingto ensure that there is brake fluid in the
reservoir throughout the entire operation.
1
Tighten up the bleed valve and disconnect the tube.
Top up the reservoir to the correct level with brake
fluid see (CHECKING AND TOPPING UP THE
BRAKE FLUID).
Refit the protective rubber cap.
ch. 2
Release 00
2001-03
2-29
Routine maintenance operations
RS 50
ADJUSTING THE REAR BRAKE
3
4
The brake pedal is adjusted to fit most riders during
manufacture.
If you wish to adjust the brake pedal:
2
Position the motorcycle on the stand.
Loosen the lock nut (1).
Unscrew the brake adjusting bolt (2) completely.
Loosen the lock nut (3) on the master cylinder push
rod (4) and run it as far towards the master cylinder as
far as it will go on the threads of the push rod.
Screw the push rod (4) completely into the clevis, then
unscrew it three to four turns.
Adjust the brake adjuster bolt (2) until the brake pedal
(5) is positioned as you like it.
Screw down and tighten the lock nut (1) on the brake
adjuster bolt (2).
Screw the master cylinder push rod (4) out of the
clevis until it just contacts the master cylinder piston.
Then, screw the push rod into the clevis to obtain a
minimum clearance of 0.5 - 1 mm (0.02 - 0.04 in)
between the master cylinder push rod (4) and the
master cylinder piston.
1
CAUTION
Be sure there is the specified clearance between
the master cylinder push rod and the master
cylinder piston. If this caution is not observed, the
brake will remain slightly applied, with subsequent brake overheating and wear of pads and
discs.
Clearance between the push rod and the piston:
0.5 - 1 mm (0.02 - 0.04 in).
Lock the push rod in position with the lock nut (3).
5
WARNING
After making any brake adjustment apply the
brakes repeatedly. Try the brakes in a parking lot
or other area where there is little traffic. After you
have completed the adjustment, lift the wheel free
of the ground and ensure that it rotates freely
when the brake is released.
2-30
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
ADJUSTING THE CLUTCH
The clutch needs adjusting when the engine cuts out,
or when the motorcycle tends to move forward when it
is in gear with the clutch lever engaged, or when the
clutch “slips”, causing a lag in the acceleration in
relation to the engine speed.
2
A limited range of adjustment of the clutch can be
accomplished using the adjuster (1) located at the left
handlebar:
Position the motorcycle on the stand.
Pull back the rubber boot (2).
Loosen the lock nut (3).
Turn the adjuster (1) until the play at the end of the
clutch lever reaches the distance A (A = 10 to 15 mm /
0.4 to 0.6 in).
Tighten (screw in) the nut (3) to lock the adjuster (1).
Recheck the free play.
Reposition the rubber boot (2).
1
2
3
A
NOTE Inspect the clutch cable to make sure that it is
not damaged. The inner cable must have no broken
strands, and the outer cable must not be kinked or
bent.
Lubricate the clutch cable at periodic intervals with a
suitable lubricant see (LUBRICANT CHART), to
prevent premature wear and corrosion.
ADJUSTING THE SHIFT LEVER
The shift lever may be adjusted by adjusting the
length of the rod (4) as follows:
Position the motorcycle on the stand.
Loosen the nuts (5, 6).
Rotate the rod to adjust the shift lever position.
Tighten the nuts (5, 6).
Lubricate the shift lever pivot see (LUBRICANT
CHART).
5
4
ch. 2
Release 00
2001-03
6
2-31
Routine maintenance operations
RS 50
STEERING
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
To improve the handling, the steering has been fitted
with antifriction bearings.
The steering must be set correctly to ensure that the
handlebar turns smoothly and steers the bike safely.
If the steering is too tight, the handlebar will not turn
smoothly, and if it is too loose it will make the motorcycle more unstable.
CHECKING THE PLAY IN THE BEARINGS
see
Position the motorcycle on the rear stand
(POSITIONING THE MOTORCYCLE ON THE REAR
SUPPORT STAND ).
Shake the fork back and forward in the direction of
travel.
If you can feel play in the fork, then it needs to be
adjusted.
CHECKING THE PLAY ON THE BEARINGS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Unscrew and remove the steering sleeve cap (1) and
its washer (2).
Unscrew the two screws (3) that secure the plate on
the top of the fork legs.
Unscrew and remove the fork caps (4).
4
3
5
3
1
2
Keep the front wheel straight when removing the plate
from the top of the fork.
Withdraw the plate (5) from its seat on top of the fork
and tighten the ring nut (6).
Tightening of ring nut (6):
tighten fully by hand + 1/4 of a turn.
6
2-32
Release 00
2001-03
4
ch. 2
Routine maintenance operations
RS 50
Reposition the top plate (5), fitting it in correctly.
Position the washer (2) on the sleeve then screw in
and tighten up the sleeve cap (1).
3
5
3
4
4
Torque setting for sleeve cap (1):
80 Nm (8.0 kgm) [59 Ft-lb].
Screw in and tighten up the screws (3).
Torque setting for screws (3):
24 Nm (2.4 kgm) [17.7 Ft-lb].
2
1
Screw in and tighten up the fork caps (4).
Torque setting for fork caps (4):
5 Nm (0.5 kgm) [3.7 Ft-lb].
2
WARNING
When finished, make sure that the handlebar turns
smoothly; if it doesn’t, there is a risk of damaging
the raceways and affecting the maneuverability of
the motorcycle.
DRIVE CHAIN
Read carefully (SERVICING SCHEDULE).
This motorcycle is equipped with a chain and master
link.
When the master link is installed, the clip (6) must be
installed with the closed end in the direction of travel
as shown above.
6
WARNING
An excessively loose chain can come off the
sprocket which can result in a serious accident
and serious damage to the motorcycle from the
upset and subsequent serious injury or even
death.
Do not ride your motorcycle with an improperly
adjusted chain (ADJUSTMENT).
ch. 2
Release 00
2001-03
2-33
Routine maintenance operations
RS 50
WARNING
To inspect the condition of the chain, grasp the
chain where it goes around the sprocket and try to
pull it away from the sprocket. If you can move it
more than one-eighth of an inch away from the
sprocket, the chain is worn out and the chain and
both front and rear sprockets must be replaced.
CHECKING THE PLAY
To check the play:
Stop the engine.
Position the motorcycle on the stand.
Shift to neutral.
Check the chain play. It should be 25 mm (0.98 in) at
mid-bottom span as shown above.
Move the motorcycle forward or backward, or support
the rear wheel in the air and turn the wheel to several
positions, to check the chain slack at several locations. If the slack is markedly different with the wheel
in different positions, the chain and sprockets must be
replaced.
25 mm
(0.98 in)
WARNING
Do not ever operate your motorcycle with a damaged chain. This could cause wheel seizure which
could lead to an upset with subsequent serious
injury or death. Lubricate your chain frequently to
minimize the possibility of this kind of damage
(CLEANING AND LUBRICATION).
If the play is the same at several locations, but is more
or less than 25 mm (0.98 in), adjust it, see (ADJUSTMENT).
2-34
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
ADJUSTMENT
2
NOTE To adjust the chain it is necessary to use the
appropriate rear support stand .
4
To adjust the chain tension:
Position the motorcycle on the appropriate rear
, see (POSITIONING THE MOTORsupport stand
CYCLE ON THE REAR SUPPORT STAND ).
Loosen the nut (1) to several turns.
2
1
5
NOTE In order to make wheel centering in the swinging arm easier, there are reference marks (2-3) on the
swing arm. See illustration above.
Loosen the two lock nuts (4).
Adjust the tension adjusters (5) to obtain the appropriate
chain play, ensuring that the edge of tension adjuster is in
the same position with regard to the reference marks (23) on each side of your motorcycle.
Tighten the two lock nuts (4).
Tighten the nut (1).
Wheel nut tightening torque:
73.8 Ft-lb (10 kgm) [100 Nm].
Check the chain play again, see (CHECKING THE PLAY).
3
4
5
CHECKING THE WEAR OF THE CHAIN AND SPROCKETS
In addition to the check inspect the chain and sprockets to
make sure that there are no:
Damaged rollers.
Loose pins.
Dry, rusty, crushed or seized links.
Excessive wear.
Sprocket or teeth excessively worn or damaged.
CAUTION
If chain rollers are damaged and pins are loose, both
sprockets as well as the chain must be replaced.
CAUTION
Lubricate the chain frequently, especially if it
displays any rust or if it is dry to the touch. If, after
lubricating the chain, it still has links which cannot
be turned easily, the chain must be replaced.
Finally, check the wear of the rear fork protection shoe.
WARNING
Keep your fingers well clear of the chain and
sprocket, especially if you are turning the rear
wheel while working on the motorcycle. You can
easily be seriously injured if a finger is caught
between the chain and sprocket.
ch. 2
Release 00
2001-03
2-35
Routine maintenance operations
RS 50
CLEANING AND LUBRICATION
CAUTION
Carry out the adjustment, lubrication, cleaning
and change of the chain with great care.
Lubricate the chain every 500 km (312 mi) or whenever it appears dry.
Use a proprietary chain lubricant or SAE 80W- 90 oil.
Never wash your motorcycle, and especially never
wash the chain, with high pressure water, coin operated car laundry wand, steam cleaner, or inflammable
solvent.
ROUTINE MAINTENANCE AND
SERVICING OPERATIONS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Check the state of the tread after the first 1,000 km
(625 miles) and then every 4,000 km (2,500 miles) or
8 months.
Check the inflation pressure every month at ambient
temperature.
This motorcycle is equipped with tubeless tires.
TREAD STATE
WARNING
Check the tire inflation before you ride your motorcycle, at least once a week, (see TECHNICAL DATA).
Pressure measurement must always be carried out
when the tires are cold, as when the tires are warmed
up, pressure will increase, and if they are checked at
this time erroneous readings will be seen.
If the tire is inflated to too high a pressure, an
uncomfortably harsh ride will result, and riding
comfort will be compromised. Also, road holding,
especially during turns and in wet conditions,
will likewise be compromised.
If the tire is underinflated (pressure is too low), the
tire may slip on the rim with consequent loss of
control. Again, road holding and handling characteristics will be degraded, and brake performance
will be reduced.
When the tire is worn to a point where any tread is
less than 3 mm (0.12 in) deep, the tire is worn out,
and must be replaced. Also, if a tire suffers a
puncture that is larger than 5 mm (0.20 in) in its
longest dimension, the tire must not be repaired,
but should be replaced.
After a tire is repaired, balance the wheels. Use
only tires that are listed, (see TECHNICAL DATA).
Insure that all tires are equipped with properly
installed valve caps.
TREAD MINIMUM THICKNESS LIMIT (A):
front and rear .................................. 1,5 mm (
0.0059 in (
2-36
Release 00
2
1
A
3 mm)
0.12 in)
2001-03
ch. 2
Routine maintenance operations
RS 50
WARNING
Do not use the motorcycle if the tire wear indicators
signal that a change is necessary.
Some types of tires approved for this motorcycle
are provided with wear indicators. There are several
kinds of wear indicators.
For more information on how to check the wear,
contact your Dealer.
Visually check if the tires are worn and in this case
have them changed. If a tire goes flat while you are
riding your motorcycle, do not attempt to continue.
Avoid abrupt braking and steering. Slowly move
over to the shoulder and stop, using engine compression to slow you down.
2
WARNING
Failure to obey these instructions can lead to an
upset with consequent serious injury or even death.
If your tires are older than five years, even if they
are not completely worn out, they have probably
become hard and brittle, and may not allow for good
road holding. If the tires are noticeably hard, or
develop checks or cracks, have them replaced.
Use only tires of the size listed in the TECHNICAL
DATA. Do not install an oversized or undersized tire.
Likewise, do not install tube-type tires on rims
intended for tubeless tires, and vice-versa.
Inflation pressure
FRONT: ............................... 90/80 17” 46S
............................................ 90/80 17” 46P
Inflation pressure
rider only ............................. 170 kPa (1.7 bar) [24.6
Psi]
Inflation pressure
rider plus passenger (*) ....... 180±10 kPa (1.8±0.1 bar)
[26±1.4 Psi]
REAR: ................................. 110/80 17” 57S
............................................ 110/80 17” 57P
Inflation pressure
rider only ............................. 190 kPa (1.9 bar) [27.5
Psi]
Inflation pressure
rider plus passenger (*) ....... 210±10 kPa (2.1±0.1 bar)
[30.4±1.4 Psi]
(*) = in countries where passengers are to be carried
WARNING
Repair, maintenance, changing and balancing of
tires are very important to your safety, and should
only be performed by qualified mechanics using
the appropriate tools.
ch. 2
Release 00
2001-03
2-37
Routine maintenance operations
RS 50
WARNING
New tires are often covered with a slippery mold
release compound. Scrub the tires in by riding
slowly and making numerous turns for the first
few miles.
Do not use any kind of tire dressing or other liquid
on your tires. Especially do not permit any petroleum products, such as oil, gasoline or brake fluid
to come in contact with the tires. If you do, wipe it
immediately, then scrub the tire with soap and
water and a stiff brush. Do not use a tire that is
worn out.
Minimum tread depth is measured as shown
above. The minimum tread depth (A) for both the
front and the rear tires is 3 mm (0.12 in).
A
FUEL LINES
Read carefully (FUEL).
Check the state of the fuel lines every 4,000 km
(2,500 miles) or 8 months.
Renew them every 4 years.
Change the fuel lines if there are any signs of
wear, scraping etc.
For further information, see (FUEL FEED SYSTEM).
BRAKE PIPES/HOSES
Read carefully (BRAKE FLUID).
Check the state of the pipes/hoses every 4,000 km
(2,500 miles) or 8 months; renew them every 4 years.
Change the pipes/hoses if there are any signs of
wear, scraping, etc.
COOLING
SYSTEM HOSES
Read carefully (COOLANT).
Check the state of the cooling system hoses (1) every
4,000 km (2,500 miles) or 8 months.
Change the cooling system hoses if there are any
signs of wear, scraping, etc.
2-38
Release 00
2001-03
1
ch. 2
Routine maintenance operations
RS 50
2 STROKE OIL PIPES/HOSES
Check the state of the 2 stroke oil pipes/hoses (2)
every 4,000 km (2,500 miles) or 8 months.
Renew them every 4 years.
Change the 2 stroke oil pipes/hoses if there are
any signs of wear, scraping, etc.
2
TIGHTENING NUTS AND BOLTS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Check after the first 1,500 km (936 miles) and then
every 7,500 km (4,687 miles) or 8 months.
Make a thorough check of all the fasteners, especially
on the essential safety components, i.e.:
handlebars;
front brake control lever;
clutch control lever;
fuel delivery tube;
front fork and plates;
fork pinch screws / front wheel spindle;
front wheel;
front brake hose connections;
front brake discs;
front brake calipers;
engine;
sprocket;
rear brake control lever;
swing arm;
swing arm lever mechanism;
rear suspension;
rear wheel;
rear brake disc;
rear brake caliper;
rear brake hose connections.
WARNING
The fasteners must be tightened to the specified
torque wrench settings, using LOCTITE ® where
specified, see (FASTENERS).
ch. 2
Release 00
2001-03
2-39
Routine maintenance operations
RS 50
FASTENERS
Check, tightening when necessary, after the first 1,000 km (625 miles) and then every 7,500 km (4,687 miles) or 8
months.
WARNING
The fasteners listed in the table below must be tightened to the specified torque settings, using a torque
wrench and, where indicated, LOCTITE ® .
Fasteners marked (
) are particularly important for safety.
FRAME
Description
Pillar to frame
Pillar to frame
Cradle to upper frame
Cradle to lower frame
Fairing bracket
Arch to frame
Wire guide to cradle
Radiator to cradle
Air box to pillar
Exhaust pipe support to pillar, rh side
Qty.
2
2
2
2
2
2
1
1
1
2
Description
Plate to rh-lh pillar support
Footrest support to lower cross member
Footrest support to upper frame
Qty.
2
2
2
Description
Stand to frame
Qty.
1
Description
Adjustment bush setting
Rear mudguard/guard to swing arm
Swing arm pin
Qty.
1
3
1
Screw/nut
hex fl. M8x25
hex fl. M10x35
hex fl. M8x35
hex fl. M8x35
hex fl. M6x16
hex fl. M6x30
hex fl. M6x16
hex fl. M6x12
hex fl. M6x16
hex fl.M8x20
Nm (Ft-lb)
24 (17.7)
47 (34.7)
24 (17.7)
24 (17.7)
10 (7.4)
15 (11.1)
10 (7.4)
7 (5.2)
5 (3.7)
24 (17.7)
Kgm
2.4
4.7
2.4
2.4
1
1.5
1
0.7
0.5
2.4
Code
8152287
8152318
8152289
8152289
8152278
8152281
8152278
8152277
8152278
8152286
Nm (Ft-lb)
10 (7.4)
25 (18.4)
25 (18.4)
Kgm
1
2.5
2.5
Code
8150137
8152288
8152288
Nm (Ft-lb)
2.5 (1.8)
Kgm
2.5
Code
8152310
Screw/nut
Nm (Ft-lb)
Dwg.102876
3 (2.2)
socket screw M5x12 3 (2.2)
Dwg.102875
70 (51.6)
Kgm
0.3
0.3
7
Code
8221278
8152302
8225332
Kgm
8
0.5
2.4
1
2.4
Code
8203579
8150280
on plate
8152278
8150211
8150349
FOOTREST
Screw/nut
Allen screw M6x16
hex fl. M8x30
hex fl. M8x30
STAND
Screw/nut
Dwg.11767
SWING ARM
FRONT SUSPENSION
Description
Sleeve nut
Caps to fork legs
Upper plate side screws
Stiffener plate to fork
Steering lock
Steering lock
2-40
Qty.
1
2
2
4
1
1
Release 00
Screw/nut
Nut M20x1,5
Allen screw M5x16
Allen screw M8
hex fl.M6x16
Allen screw M8x16
Pull screw
2001-03
Nm (Ft-lb)
80 (59)
5 (3.7)
24 (17.7)
10 (7.4)
24 (17.7)
ch. 2
Routine maintenance operations
RS 50
REAR SUSPENSION
Description
Shock absorber to swing arm
Shock absorber to pillar
Qty.
1
1
Description
Shift lever pin
Joint to brake lever
Joint to transmission
Engine to frame
Starter lever
Carburetor screw
Neutral cable to engine switch
Shift lever connecting rods
Air box hose to carburetor
Sprocket guard
Qty.
1
1
1
3
1
1
1
1
1
1
Screw/nut
Nm (Ft-lb)
Allen screw M10x60 48 (35.4)
Allen screw M10x60 48 (35.4)
Kgm
4.8
4.8
Code
8150049
8150049
Kgm
1.2
0.5
0.5
2.4
0.1
0.2
0.1
1
0.3
0.4
Code
8121284
8152299
8152299
8150388
Screw on carburetor
Screw on carburetor
Screw on engine
8152279
8102401
8152298
Nm (Ft-lb)
10 (7.4)
Kgm
1
Code
8221270
Screw/nut
Nm (Ft-lb)
Nut M8
25 (18.4)
Allen screw m8x12 12 (8.8)
Allen screw m8x12 12 (8.8)
Kgm
2.5
1.2
1.2
Code
8152300
8152112
8152112
Kgm
0.4
Code
8152298
Kgm
8
0.8
Code
8225195
Screw on fork
Nm (Ft-lb)
80 (59)
Kgm
8
Code
8225208
Nm (Ft-lb)
22 (16.2)
12 (8.8)
Allen screw 2.2x12.7 0.5 (0.4)
Kgm
2.2
1.2
0.05
Code
8152288
Already on pump
8150238
ENGINE
Screw/nut
Nm (Ft-lb)
Dwg.5058
12 (8.8)
Nut M6
5 (3.7)
Nut M6
5 (3.7)
Allen screw M8x100 24 (17.7)
1 (0.7)
2 (1.5)
1 (0.7)
hex. M6x20
10 (7.4)
Clamp
3 (2.2)
socket screw M5x16 4 (2.9)
AIR BOX
Description
Air box support pin
Qty.
2
Screw/nut
Dwg.103316
EXHAUST SYSTEM
Description
Silent-block to cross member
Exhaust pipe to silent-block
Muffler to support
Qty.
1
1
1
COOLING SYSTEM
Description
Water filler to dashboard closing cowl
Qty.
1
Screw/nut
Nm (Ft-lb)
socket screw M5x16 4 (2.9)
FRONT WHEEL
Description
Front wheel spindle
Leg to wheel spindle
Qty.
1
1
Screw/nut
Nm (Ft-lb)
Nut M12x1.25
80 (59)
Allen screw M6
8 (5.9)
REAR WHEEL
Description
Rear wheel spindle
Qty.
1
Screw/nut
Nut
FRONT BRAKE
Description
Front brake caliper
Front brake master cylinder assy.
Stop switch to front brake lever
ch. 2
Qty.
2
2
2
Screw/nut
hex. fl. M8x30
Release 00
2001-03
2-41
2
Routine maintenance operations
RS 50
REAR BRAKE
Description
Rear brake lever pin
Rear brake master cylinder
Brake lever adjuster
Rear brake caliper
Brake fluid reservoir
Qty.
1
2
1
2
1
Screw/nut
Dwg.5058
hex fl. M6x20
hex fl. M5x16
hex fl. M8x20
hex fl. M6x16
Nm (Ft-lb)
12 (8.8)
10 (7.4)
5 (3.7)
22 (16.2)
3 (2.2)
Kgm
1.2
1
0.5
2.2
0.3
Code
8121149
8152279
8152273
8152286
8152278
Nm (Ft-lb)
12 (8.8)
2 (1.5)
2 (1.5)
2 (1.5)
Kgm
1.2
0.2
0.2
0.2
Code
Already on control
Already on switch
Already on carburetor
Already on switch
Kgm
0.7
0.7
1.7
0.2
1.2
0.2
Code
8152282
8152278
8222019
8150423
8152277
8150270
Kgm
0.6
0.4
0.4
0.7
0.3
0.3
Code
8152246
8152186
8152186
8150314
8152108
8152043
Nm (Ft-lb)
10 (7.4)
Kgm
1
Code
8150430
Screw/nut
Nm (Ft-lb)
hex fl. M6x20
5 (3.7)
Nut M6
5 (3.7)
swp 3.9x10
2 (1.5)
Nut M5
2 (1.5)
Nut M6
5 (3.7)
Allen screw M6x8 5 (3.7)
Kgm
0.5
0.5
0.2
0.2
0.5
0.5
Code
8152279
8150333
8150444
8152306
8152299
8152213
HANDLEBAR CONTROLS
Description
Clutch control
Lh main/dipped beam switch
Throttle control
Rh main/dipped beam switch
Qty.
1
2
2
2
Screw/nut
Cover screws
ELECTRICAL COMPONENTS
Description
Voltage regulator to cradle
Transducer to frame
Thermistor
Tail light to support
Horn
Tail light to central fairing
Qty.
1
2
1
2
1
3
Description
2 stroke oil tank
Petrol cock
Aluminum filler to tank
Tank cover to pillar (rear part)
Tank cover to petrol tank
Ring nut to tank cover
Qty.
4
2
6
1
2
5
Screw/nut
hex fl. M6x35
hex fl. M6x16
Nm (Ft-lb)
7 (5.2)
7 (5.2)
17 (12.5)
Allen screw 4.2x25 2 (1.5)
hex fl. M6x12
12 (8.8)
Allen screw 4.2x20 2 (1.5)
TANKS
Screw/nut
Nm (Ft-lb)
socket screw M6x16 6 (4.4)
socket screw M6x12 4 (2.9)
socket screw M6x12 4 (2.9)
hex fl. M6x70
7 (5.2)
socket screw M6x15 3 (2.2)
Allen screw M4x10 3 (2.2)
DASHBOARD
Description
Dashboard to arch
Qty.
3
Description
Passenger saddle strap
Passenger saddle strap
Passenger saddle to rear fairing
Passenger saddle to rear fairing
Passenger saddle strap
Saddle closing lever
Qty.
2
2
7
2
2
1
Screw/nut
Nut M6
SADDLES
2-42
Release 00
2001-03
ch. 2
Routine maintenance operations
RS 50
BODY
Description
Reflector to front mudguard
Front mudguard to stiffener plate
Front mudguard to fork
Rear fairing lower closing cowl to pillar
Rear fairing lower closing cowl to pillar
Rear reflector to license plate holder
Headlight support to license plate holder
Rear fairing lower closing cowl to license plate holder
Dashboard closing cowl to arch
Front fairing to arch
Pillar cover to rear fairing (rh-lh)
Complete rear fairing to pillar cover
Complete rear fairing to pillar cover
Fairings to frame
Fairing to saddle cowl and fairing interior
Lh fairing extension to fairing
Fairing interior to fairing
Fairing interior to fairing
Qty.
4
4
2
2
1
2
2
3
1
4
4
2
2
4
8
2
4
4
Screw/nut
Nm (Ft-lb)
Nut M4
3 (2.2)
hex fl. M6x16
7 (5.2)
socket screw M5x12 5 (3.7)
socket screw M6x16 5 (3.7)
socket screw M5x9 5 (3.7)
Nut M4
3 (2.2)
Allen screw 4.8x13 3 (2.2)
socket screw M6x16 5 (3.7)
socket screw M5x12 4 (2.9)
socket screw M6x16 5 (3.7)
socket screw M5x12 3 (2.2)
socket screw M5x20 3 (2.2)
socket screw M5x12 3 (2.2)
socket screw M5x12 3 (2.2)
socket screw M5x12 3 (2.2)
socket screw M5x12 3 (2.2)
Allen screw 3.9x14 1 (0.7)
Allen screw 3.9x7.5 1 (0.7)
Kgm
0.3
0.7
0.5
0.5
0.5
0.3
0.3
0.5
0.4
0.5
0.3
0.3
0.3
0.3
0.3
0.3
0.1
0.1
Code
8150204
8152278
8152302
8152246
8152339
8150204
8150246
8152246
8152302
8152246
8152302
8152269
8152302
8152302
8152302
8152302
8150413
8150420
Kgm
1.5
0.3
Code
8152305
8150246
2
CHAIN
Description
Chain adjustment screw
Chain guide to swing arm
Qty.
2
1
Screw/nut
Nm (Ft-lb)
Nut M8 low
1.5 (0.8)
Allen screw 4.8x13 3 (2.2)
Steel / aluminum screws with similar
modulus
SCREW
M4
M5
M6
M8
M10
M12
Nm (Ft-lb)
3 (2.2)
6 (4.4)
12 (8.8)
25 (18.4)
50 (36.9)
80 (59)
ch. 2
kgm
0.3
0.6
1.2
2.5
5.0
8.0
Release 00
2001-03
2-43
Routine maintenance operations
RS 50
NOTES
2-44
Release 00
2001-03
ch. 2
Engine
RS 50
3
Engine
ch. 3
Release 00
2001-03
3-1
Engine
RS 50
ENGINE COMPONENTS THAT CAN BE
REMOVED WITHOUT REMOVING THE
ENGINE FROM THE FRAME
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
The parts listed below can be removed and refitted
without removing the engine from the frame.
WARNING
The procedures in this chapter are described in a
series of ordered steps.
The overlapping of operations in references to
other chapters must be interpreted in a logical
way, to avoid the unnecessary removal of components.
Carry out only the operations necessary for the
removal of the component in question.
TOP
Carburetor (1)
Reed valve set (2)
Spark plug (3)
Thermostat (4)
Thermistor (5)
RIGHT SIDE
Water pump (8)
Oil pump
Clutch cover
Clutch
LEFT SIDE
Sprocket (9)
Flywheel side cover (10)
Flywheel
Stator
Pick-up
Starter motor (11)
FRONT
Exhaust pipe
Cylinder head (6)
Cylinder (7)
3
4
6
2
1
5
7
9
8
10
11
NOTE For instructions on the removal of the parts, refer to WORKSHOP MANUAL
3-2
Release 00
2001-03
N° 966 X (
N° 967 X (
N° 968 X (
N° 969 X (
N° 970 X (
N° 971 X (
ch. 3
)
)
)
)
)
)
Engine
RS 50
REMOVING THE COMPLETE ENGINE
FROM THE FRAME
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
WARNING
Removing the engine is a particularly complex
task. Study the motorcycle carefully before proceeding.
3
The procedures in this chapter are described in a
series of ordered steps.
The overlapping of operations in references to
other chapters must be interpreted in a logical
way, to avoid the unnecessary removal of components.
Carry out only the operations necessary for the
removal of the component in question.
Before proceeding with the operations described
below, remember that the engine has to be removed from the frame in a downward direction;
make sure you have the necessary equipment
correctly positioned.
Switch the ignition key to the “ “ position.
Position the motorcycle on the rear stand
(POSITIONING THE MOTORCYCLE ON THE REAR
STAND).
Remove the rider saddle (REMOVING THE RIDER
AND PASSENGER SADDLE).
Disconnect the battery leads: first the negative (-) and
then the positive (+).
WARNING
When refitting the battery, connect the positive
lead (+) first, and then the negative lead (–).
Removing the tank (REMOVING THE FUEL TANK).
Remove the side fairings (REMOVING THE SIDE
FAIRINGS).
Remove the saddle cowl (REMOVING THE SADDLE
COWL).
Completely drain the cooling system (CHANGING THE
COOLANT).
Remove the carburetor (REMOVING THE CARBURETOR).
Remove the complete exhaust pipe (REMOVING THE
EXHAUST PIPE).
ch. 3
Release 00
2001-03
3-3
Engine
RS 50
Unscrew the ring nut (1) and remove the tachometer
cable (2).
2
1
Slide the boot (3) back.
Loosen the nut (4) by screwing it counterclockwise.
Turn in the adjustor (5) to slacken the clutch cable.
5
3
4
Push the clutch lever (6) on the engine and disconnect the clutch cable (7).
7
6
Loosen and remove the two screws (8) that secure
the oil pump cover.
Remove the oil pump cover (9).
9
8
3-4
Release 00
2001-03
ch. 3
Engine
RS 50
13
Disconnect the oil pump control cable (10) and withdraw the cable from the wire guide (11).
After withdrawing the oil line grommet, loosen and
slide back the clamp (12) and withdraw the oil inlet
tube (13).
12
11
NOTE Plug the end of the oil inlet tube (13) immediately with a screw of suitable diameter to stop the oil
coming out.
10
3
WARNING
Wash your hands thoroughly after handling oil.
Dispose of used oil properly.
KEEP OUT OF REACH OF CHILDREN.
Remove the screw (14) and withdraw the water pump
inlet hose (15) along with the connected hoses.
14
15
Remove the four screws (16) and withdraw the inlet
manifold (17).
16
16
17
Remove the electrical connection (18) from the
thermistor (19).
Disconnect the spark plug cap (20).
Remove the clamp (21) from the cylinder headradiator coolant hose (22) and disconnect the hose.
Remove the clamp (23) from the heater hose (24) and
disconnect the hose.
20
22
18
23
19
24
WARNING
Use new clamps (21) and (23) when refitting the
hoses.
21
ch. 3
Release 00
2001-03
3-5
Engine
RS 50
WARNING
Remove all the clamps all the way along the
cables and hoses.
Prepare the same number of new clamps for
refitting the cables and hoses.
Plug all the openings in the engine, tubes and
hoses to prevent foreign bodies from getting in
the way.
Group the electric cables together and fasten them
with adhesive tape to stop them getting in the way
when removing the engine in a downward direction.
Disconnect the electrical connection (25) from the
starter motor and magneto.
25
Unscrew the two screws (26) to remove the sprocket
guard (27).
26
27
Remove the chain (28) (REMOVING THE DRIVE
CHAIN).
Unscrew and remove the ground lead (30) retainer
screw (29).
Unscrew the screw (31) and withdraw the gearbox
drive connecting rod (32) from the selector shaft (33).
Unscrew and remove the 5 screws (34) to remove the
flywheel casing cover (35).
34
28
34
35
29
34
31
30
3-6
Release 00
2001-03
32
33
ch. 3
Engine
RS 50
Unscrew and remove the 2 screws (36) and unscrew
the screw that holds the bracket on the back of the
starter motor.
Remove the starter motor (37).
37
3
36
Remove the engine cradle (38) (REMOVING THE
ENGINE CRADLE).
Prepare a hoist and straps for lifting.
WARNING
The hoist and straps must be strong enough to
bear the weight of the engine in complete safety.
Failure to use appropriately strong straps could
allow the engine to fall with subsequent damage
to the engine and possible personal injury to you.
Attach the straps to the hoist and to the engine.
Couple the straps to the hoist and sling up the engine.
38
CAUTION
The straps must be attached to the engine and to
the hoist in a secure and stable manner so that
the lifting can be done in complete safety.
Raise the hoist arm so that the straps take all of
the engine weight off of the engine mounting
bolts.
Raise up the hoist arm so that the straps take the
strain of the engine weight.
CAUTION
Raise the hoist arm just enough to hold the engine
in position to allow for the removal of the engine
mounting bolts.
ch. 3
Release 00
2001-03
3-7
Engine
RS 50
Remove the two engine mounting bolts from the frame
(39), and remove the washers and self-locking nuts
from the opposite side.
39
CAUTION
The engine is now free and not fastened at any
point.
Handle it with care; be careful about your fingers
and limbs.
Remove any loose tools from the area of ground
where the engine is to be put down and clean it
thoroughly.
Raise the hoist arm a few millimeters to “unlock” the
engine from the frame.
Lower the hoist arm and rest the engine on the
ground.
Make sure the engine is properly balanced on the
ground and won’t tip over.
Remove the straps from the hoist and the frame.
NOTE If no work is to be done on the engine, it is
permissible to leave the straps attached to the engine
and the hoist.
Clean the outside of the engine thoroughly.
CAUTION
Use a mild detergent, bristle brushes and cloths to
clean the outside of the engine.
Do not use acidic, highly alkaline or solvent-based
cleaners which can damage the rubber and plastic
parts particularly.
3-8
Release 00
2001-03
ch. 3
Fuel supply system
RS 50
4
Fuel supply system
ch. 4
Release 00
2001-03
4-1
Fuel supply system
RS 50
FUEL TANK
The fuel tank is equipped with a filler cap, and a fuel valve. The valve, as shown in the figure, has three positions
(OFF, ON and RES), which may be selected with the valve lever.
When the lever is in the ON position (normal), the main passage is open. When the lever is in the RES position, the
auxiliary fuel reserve passage is open. When the lever is in the OFF position, both passages are closed.
2
1
4
5
3
Key
1)
2)
3)
4)
5)
Fuel tank
Filler cap
Fuel valve
Water drain tube
Fuel delivery tube
4-2
Release 00
2001-03
ch. 4
Fuel supply system
RS 50
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (FUEL).
MAINTENANCE
4
To service the tank, it has to be removed (REMOVING
THE TANK) and washed completely.
CHECKING
THE FUEL FEED
Check the fuel pipes/hoses every 4,000 Km (2,500
miles) or 8 months.
Any pipes/hoses that show cracks or cuts must
always be replaced.
If you see a fuel leak in the vicinity of the fuel valve,
this could be because of a damaged O-Ring gasket.
Remove the fuel valve (REMOVING THE FUEL
VALVE), check its condition and, if necessary, replace
with a new one.
Open the filler cap and make sure the fuel tank
breather is not blocked. If necessary, unblock it with a
compressed air jet.
ch. 4
Release 00
2001-03
4-3
Fuel supply system
RS 50
REMOVING
THE FUEL VALVE
Raise up the tank (RAISING THE FUEL TANK).
Remove the screws (1) and extract the complete fuel
valve (2).
Reposition the petrol cock (2) under the tank and
screw in the two screws (1).
2
Torque setting for screws (1):
4 Nm (0.6 kgm).
1
REMOVING THE CARBURETOR
8
Reads carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Partially remove the fuel tank (RAISING THE FUEL
TANK).
Remove the air box (REMOVING THE AIR BOX).
Remove the clamp (3) from the inlet tube (4) coming
from the oil pump and disconnect the tube.
Remove the two screws (5) from the throttle control
cover (6) and remove the cover.
Remove the clamp (7) from the fuel hose (8) and
disconnect the hose.
Remove the screw from the carburetor manifold.
5
6
4
7
5
3
CAUTION
Danger of fuel splashing out.
Plug the free end of the fuel hose (8) and fasten it to
the motorcycle in a vertical position.
Loosen the screw that attaches the carburetor to the
reed valve manifold and take off the carburetor.
NOTE Before refitting, check the condition of the fuel
and oil lines (FUEL LINES, 2 STROKE OIL PIPES/
HOSES).
Fit the carburetor into the reed valve manifold and
secure it with the screw.
Connect the carburetor hose (8) and secure it to the
carburetor with the clamp (7).
Connect the oil feed tube coming from the pump (4)
and secure it with the clamp (3).
Fit the throttle control cover (6) and secure it with the
two screws (5).
4-4
Release 00
2001-03
ch. 4
Fuel supply system
RS 50
5
8
7
2
6
16
12
19
6
21
9
20
11
1
16
3
13
4
14
10
15
4
6
17
18
DESCRIPTION
1)Choke
2)Throttle valve
3)Main jet
4)Float
5)Deflector tube kit
6)Gaskets
7)Valve cover
8)Throttle valve return spring
9)Connection fitting retainer screw
10)Throttle valve adjustment screw
11)Fuel line connection fitting
12)Fuel filter
13)Choke control shaft
14)Needle
15)Float pin
16)Clamp screw
17)Float chamber
18)Float chamber retainer screw
19)Adapter
20)Choke shaft washer
21)choke shaft nut
Specifications
Version
Type
Choke
Main jet
Level in float chamber
Float needle
Float weight
Starter valve
Choke screw
Inlet manifold
ch. 4
Dellorto Carburetor
SHA 1412 M
Ø12 mm
(0.47 in)
63 mm
(2.48 in)
4.0 mm
(0.16 in)
1.2 mm
(0.05 in)
3.5 gr
(0.12 oz)
50
(1.96 in)
3.5 turns (3.5 turns)
14 mm
(0.55 in)
Release 00
2001-03
4-5
Fuel supply system
RS 50
REMOVING
THE 2 STROKE OIL TANK
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rider and passenger saddle (REMOVING
THE RIDER AND PASSENGER SADDLE).
Remove the fuel tank (REMOVING THE FUEL TANK).
Remove the rear fairing (REMOVING THE REAR
FAIRING).
Remove the right and left pillar covers (REMOVING
THE PILLAR COVER).
Remove the battery and fuses (REMOVING THE
BATTERY).
Remove the oil from the two stroke oil tank (REMOVING THE OIL FROM THE TWO STROKE OIL TANK).
Loosen and remove the 4 flanged screws (1) that
secure the two stroke oil tank to the frame.
1
Disconnect the oil reserve level indicator electrical
connections (2).
4-6
Release 00
2
2001-03
ch. 4
Fuel supply system
RS 50
Remove the clamp (3) and disconnect the tube (4)
that delivers oil to the pump.
3
4
To remove the two stroke oil tank (5), rotate it towards
the rear of the frame as you lift it out.
4
Reposition the two stroke oil tank in its housing,
securing it to the frame with the two flanged screws
(1).
Torque wrench settings for flanged screws (1):
6 Nm (0.6 kgm) [4.4 Ft-lb].
Connect the oil delivery tube (4) to the tank and
secure it with a new clamp (3).
Connect up the oil reserve level indicator electrical
connections (2).
ch. 4
Release 00
2001-03
4-7
Fuel supply system
RS 50
NOTES
4-8
Release 00
2001-03
ch. 4
Cooling system
RS 50
5
Cooling system
ch. 5
Release 00
2001-03
5-1
Cooling system
RS 50
REMOVING THE RADIATOR
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (COOLANT).
Remove the r.h side fairing (REMOVING THE SIDE
FAIRINGS).
Remove the saddle cowl (REMOVING THE SADDLE
COWL).
Drain all the coolant from the cooling system
(CHANGING THE COOLANT).
Remove the clamp (1) from the pump-radiator hose
(2) and disconnect the hose.
1
8
7
2
Remove the clamp (3) from the cylinder head-radiator
hose (4) and disconnect the hose.
3
4
Remove the clamp (5) from the radiator filler hose (6)
and disconnect the hose.
6
WARNING
Proceed with care. Do not damage the radiator
fins.
Remove the flanged screw (7) from the radiator
support and take out the radiator (8) in a downward
direction.
5
5-2
Release 00
2001-03
ch. 5
Cooling system
RS 50
WARNING
9
Plug the ends of the hoses, to prevent foreign
bodies from getting into them.
NOTE Replace the rubber pads (9) if worn.
9
CAUTION
Any foreign material, dirt etc. that is stuck to the
radiator fins must be removed with a blast of
compressed air.
Any bent fins must be straightened using a small
flat-bladed screwdriver.
Replace the hoses if they show any signs of
abrasion, checking or cracking.
Wash out the inside of the radiator thoroughly
before refitting it, using clean water only.
To refit, follow the removal steps in reverse order,
replacing the hose clamps.
5
REMOVING THE FILLER CAP
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (COOLANT).
Remove the l.h. side fairing (REMOVING THE SIDE
FAIRINGS).
Remove the dashboard closing cowl (2) retainer
screw (1).
1
2
1
Loosen and remove the clamp (3) from the filler hose
(4), then disconnect the hose.
Unscrew the filler cap (5), remove the screw (6) and
withdraw the filler (7).
5
WARNING
Plug the hose covers to prevent foreign material
from entering.
7
6
NOTE Replace the filler hose (4) with a new one if
3
damaged.
To refit, follow the removal steps in reverse order.
4
ch. 5
Release 00
2001-03
5-3
Cooling system
RS 50
NOTES
5-4
Release 00
2001-03
ch. 5
Electrical system
RS 50
6
Electrical system
ch. 6
Release 00
2001-03
6-1
Electrical system
RS 50
INTRODUCTION
Read carefully (PRECAUTIONS AND GENERAL
INFORMATIONS) and (BATTERY).
The information below will be useful when consulting this section.
NOTE The numbering in the specific wiring diagrams
corresponds to that in the main wiring diagram.
RECOMMENDED EQUIPMENT
Multimeter,
Hydrometer for battery electrolyte,
Timing light for 2-stroke engines, 10,000 RPM
0 to 100A direct current ammeter
130Ω 2W resistor
WIRE COLORS
Ar
Az
B
Bi
G
Gr
M
N
R
Ro
V
Vi
6-2
orange
Light blue
blue
white
yellow
gray
brown
black
red
pink
green
purple
Release 00
2001-03
ch. 6
Electrical system
RS 50
MAIN WIRING DIAGRAM
6
MAIN WIRING DIAGRAM KEY
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
Generator
Ignition coil
Voltage regulator
Rectifier
Battery
Starter relay
Brake light rear switch
Two stroke oil tank reserve sensor
Coolant temperature thermistor
Neutral gear sensor
Low beam light
Rear left turn signal light
Taillight
Rear right turn signal light
Ignition switch
Right high/low beam selector
Left high/low beam selector
Dashboard
Coolant temperature gauge
Dashboard lights
ch. 6
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
31)
32)
33)
34)
35)
36)
37)
38)
Left turn signal warning light
High beam warning light
Low beam warning light
Two stroke oil reserve warning light
Neutral gear warning light
Right turn signal warning light
Right front turn signal light
High beam light
Front parking light
Left front turn signal light
Horn
Flasher
Multiple connector
Starter motor
Spark plug
Brake light front switch
Headlight
Side stand switch
Release 00
2001-03
6-3
Electrical system
RS 50
LOCATION OF COMPONENTS
14
8
5
33
32
15
18
39
38
16
28
29
37
36
7
20
19
17
35
6
3
9
4
2
13
21 23
22
24
25 26
12
30
31 34 1
10
KEY
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
19)
20)
6-4
Generator
Ignition coil
Voltage regulator
Rectifier
Battery
Starting relay
Brake light rear switch
Two stroke oil tank reserve sensor
Coolant temperature thermistor
Neutral gear sensor
Low beam light
Rear left direction indicator
Taillight
Rear right direction indicator
Ignition switch
Right high/low beam selector
Left high/low beam selector
Dashboard
Coolant temperature gauge
Dashboard lights
Release 00
21)
22)
23)
24)
25)
26)
27)
28)
29)
30)
31)
32)
33)
34)
35)
36)
37)
38)
Left direction indicators warning light
High beam warning light
Low beam warning light
Two stroke oil reserve warning light
Neutral gear warning light
Right direction indicators warning light
Front right direction indicator
High beam light
Front parking light
Front left direction indicator
Horn
Flasher
Multiple connector
Starter motor
Spark plug
Brake light front switch
Headlight
Right high/low beam selector with engine stop
switch (in designated countries)
39) Right high/low beam selector
2001-03
ch. 6
Electrical system
RS 50
IGNITION CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
Bi/R
1
Bi/R
2
V
16
15
R
Bi
B
35
1)
2)
35)
15)
16)
Generator
Coil
Spark plug
Ignition switch
Right high/low beam selector
6
TECHNICAL DATA
Spark plug ............................................ NGK R BR9ES
Spark gap ...................... 0.6 ± 0.7 mm (0.02 ± 0.03 in)
Spark advance ................................................ 14° ± 2°
before T.D.C.
Type of ignition .................................................... C.D.I.
(fixed advance)
TROUBLESHOOTING
A. ENGINE DOESN’T RUN PROPERLY OR THERE
IS NO SPARK
Check the condition of the spark plug, replacing it if
necessary.
Disconnect the red-white wire from the ignition switch,
taking care not to ground it accidentally.
Check the wire connections.
ch. 6
Release 00
2001-03
6-5
Electrical system
RS 50
If the fault persists:
Check the H.T. lead.
Check the spark plug cap.
Check the magneto flywheel (CHECKING THE
MAGNETO FLYWHEEL).
Replace the coil with one that you know is good.
If the fault ceases:
Check the ignition switch (CHECKING THE IGNITION
SWITCH).
B. ENGINE DOESN’T STOP
Check the connection between the ignition switch and
the white-red wire.
CHECK DATA
Using a multimeter switched to the ohm scale, check
the continuity between the wires, keeping to the stated
polarities.
CHECKING THE MAGNETO FLYWHEEL
Pick-up coil:
between red and white wires 120 Ω ÷ 20 %.
Condenser charge coil:
between green and white wires 700 Ω ÷ 20 %.
CHECKING
THE IGNITION SWITCH
Disconnect the ignition switch connector.
Using a multimeter switched to the ohm scale, test the
continuity between the various wires in the connections (MAIN WIRING DIAGRAM).
6-6
Release 00
2001-03
ch. 6
Electrical system
RS 50
RECHARGE AND GENERAL POWER
SUPPLY CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
Lights
V
15
V
V
Ar
R/V
Ar
D.C. utilities
G
+
-
1
3
1)
3)
4)
5)
15)
4
5
Generator
Voltage regulator
Rectifier
Battery
Ignition switch
6
TECHNICAL DATA
Generator .................................................... 105 W a.c.
a 6000 rpm
Voltage regulator ............................................ 12 V a.c.
Battery ......................................................... 4 Ah - 12V
Fuse ..................................................................... 7.5 A
CHECKING THE RECHARGING
Start the engine.
Using the multimeter, set to D.C. volts, check the
battery voltage.
At 6000 rpm the voltage reading should be between
13.5 and 15 V with the headlight on low beam.
ch. 6
Release 00
2001-03
6-7
Electrical system
RS 50
TROUBLESHOOTING
A. BATTERY DOESN’T STAY CHARGED
Check the fuse, replacing it if necessary.
Replace the rectifier.
Check the wiring connections on the regulator, flywheel, battery and fuse.
Check the battery (CHECKING THE BATTERY).
Check the generator (CHECKING THE GENERATOR).
B. EXCESSIVE CHARGING VOLTAGE
Check the voltage regulator (CHECKING THE VOLTAGE REGULATOR).
Check the wiring connections.
C. VOLTAGE DOESN’T REACH D.C. LOADS
(green/red wires)
Check the fuse, replacing it if necessary (CHANGING
THE FUSE).
Check the wiring connections on the regulator, flywheel, battery and fuse.
Check the battery (CHECKING THE BATTERY).
Check the generator (CHECKING THE GENERATOR).
Check the ignition switch (CHECKING THE IGNITION
SWITCH) and its connections.
D. ELECTRICAL SYSTEM FUNCTIONS BADLY
Check the ground connections.
6-8
Release 00
2001-03
ch. 6
Electrical system
RS 50
CHECK DATA
CHECKING THE GENERATOR
Disconnect the yellow wire from the regulator.
Start the engine and run it at 6000 rpm.
Using a tester in A.C. voltmeter mode, test the voltage
between:
generator yellow and ground wires = reading
greater than 35 V.
Using a tester in A.C. ammeter mode, test the current
between:
generator yellow and ground wires = reading
greater than 5 A.
CHECKING THE BATTERY
Voltage without load 12.5 ± 1 V.
Electrolyte density 1.26 at 20°C (68°F).
Check the electrolyte level, topping up with distilled
water if necessary.
Check that there are no signs of sulphation; replace if
necessary.
6
STARTER CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
16
Positive
key-controlled
G/R
V/R
B
R
+
-
5
5)
6)
16)
34)
34
85
87
30
86
B
R
M
6
Battery
Starter relay
Starter button
Starter motor
ch. 6
Release 00
2001-03
6-9
Electrical system
RS 50
TECHNICAL DATA
Starter motor ........................................... 12 V - 150 W
Brush wear limit .................................. 0.9 mm (0.03 in)
Starter relay ................................................ 12 V - 70 A
Battery ........................................................ 12 V - 4 Ah
TROUBLESHOOTING
A. STARTER MOTOR DOESN’T TURN OR TURNS
VERY SLOWLY
Check the battery (CHECKING THE BATTERY).
Check the circuit (wiring and connectors).
Check the starter relay (CHECKING THE STARTER
RELAY).
Check the starter button “ “ (CHECKING THE
STARTER BUTTON).
Check the general power supply circuit.
B. STARTER MOTOR TURNS BUT ENGINE
DOESN’T TURN OVER
Check the starter motor gears (CHECKING THE
STARTER MOTOR).
C. STARTER MOTOR TURNS BY ITSELF, WITHOUT PRESSING THE BUTTON
Check the starter motor wiring connections.
Check the starter relay (CHECKING THE STARTER
RELAY).
Check the starter button “ “ (CHECKING THE
STARTER BUTTON).
6-10
Release 00
2001-03
ch. 6
Electrical system
RS 50
CHECK DATA
CHECKING THE STARTER RELAY
Disconnect all the wires from the relay.
Using a multimeter with the scale set to ohms, test the
continuity between terminals 30 and 87.
Exact value: infinity.
Apply voltage to terminals 85 and 86 with a 12 V
battery. Using a tester in ohmmeter mode, test the
continuity between terminals 30 and 87.
Exact value: 0 Ω.
16
Positive
key-controlled
G/R
V/R
B
87
30
R
+
86
B
-
5
5)
6)
16)
34)
34
85
R
M
6
Battery
Starter relay
Starter button
Starter motor
6
CHECKING THE STARTER BUTTON
Check the starter motor input current with a 0 ± 100 A
a.c. ammeter, after removing the spark plug cap, so
that the engine won’t start.
Normal values: 25 A starting, 20 A at running speed ±
15 %.
Using a multimeter with the scale set to ohms, check
the resistance between the positive and negative
terminals of the starter motor.
Normal value: 0.5 Ω ± 10 %.
CHECKING THE STARTER BUTTON “ “
Disconnect the button connector.
Using a tester in ohmmeter mode check the continuity
between the contacts in the pressed and rest positions by testing the connections (MAIN WIRING
DIAGRAM).
ch. 6
Release 00
2001-03
6-11
Electrical system
RS 50
SENSOR CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
R/V
R/V
25
R/V
24
M
19
Vi
Bi/N
8
10
B
8)
9)
10)
19)
24)
25)
Positive
key-controlled
B
9
B
B
Oil reserve sensor
Water temperature thermistor
Neutral gear sensor
Water temperature gauge
Oil reserve warning light
Neutral gear warning light
TECHNICAL DATA
All-glass type
warning light bulbs ................... 12 V - 2 W, W2.1x9.5d
TWO STROKE OIL RESERVE WARNING LIGHT
TROUBLESHOOTING
A. LOW OIL LEVEL WARNING LIGHT DOESN’T
LIGHT UP
Check the bulb.
Check for voltage on the oil warning light green/red
wire.
Check the wiring connections.
Check the oil level sensor (CHECKING THE OIL
LEVEL SENSOR).
6-12
Release 00
2001-03
ch. 6
Electrical system
RS 50
B. STAYS LIT WHEN OIL LEVEL IS SUFFICIENT
Check the wiring connections.
Check the oil level sensor (CHECKING THE OIL
LEVEL SENSOR).
CHECK DATA
CHECKING
THE OIL LEVEL SENSOR
Disconnect the sensor wires and remove the sensor
from the tank.
Set the multimeter to the ohm scale, and connect the
leads to the sensor wires.
In its upside position, you should read a valve of
infinity.
In its normal position, it should read 0 ohms.
6
DIRECTION INDICATORS CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
Az
Az
R
R
R
27
32
12)
14)
17)
21)
26)
27)
30)
32)
V/R
B/N
Az
R
14
26
17
Positive
key-controlled
Az
B
B
21
B
B
30
B
12
B
Left rear turn signal
Right rear turn signal
Turn signal selector
Left turn signal warning light
Right turn signal warning light
Right front turn signal
Left front turn signal
Flasher
ch. 6
Release 00
2001-03
6-13
Electrical system
RS 50
TECHNICAL DATA
Direction indicator
bulbs .......................................... 12 V - 10 W B.A. 15 S
Flasher ...................................................... 12 V - 22 W
All-glass type direction indicator
warning light bulbs ................. 12 V - 2 W - W2.1x9.5d
TROUBLESHOOTING
A. INDICATORS DON’T WORK
Check the bulbs.
Check the wiring connections.
Check the turn signal selector.
Check the general power supply circuit.
Replace the flasher.
B. INDICATORS STAY LIT PERMANENTLY, WITHOUT FLASHING
Check bulb specifications.
Check the battery (CHECKING THE BATTERY).
Replace the flasher.
CHECK DATA
CHECKING THE DIRECTION INDICATOR SELECTOR
Check the continuity of the bulbs.
Disconnect the selector connector.
Using a multimeter with the scale set to ohms, check
the continuity between the wires in the different
positions by testing the connections see (MAIN
WIRING DIAGRAM).
6-14
Release 00
2001-03
ch. 6
Electrical system
RS 50
HORN CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
Positive key-controlled
Gr
B
17
31
V/R
17) Horn button
31) Horn
6
TECHNICAL DATA
Horn ............................................................... 12 V c.c.
TROUBLESHOOTING
A. DOESN’T SOUND, OR SOUNDS BADLY
Check the battery (CHECKING THE BATTERY).
Check the wiring connections.
Check the horn button (CHECKING THE HORN
BUTTON).
Check the horn (CHECKING THE HORN).
ch. 6
Release 00
2001-03
6-15
Electrical system
RS 50
B. SOUNDS CONTINUOUSLY
Check the wiring connections.
Check the horn button (CHECKING THE HORN
BUTTON).
CHECK DATA
CHECKING THE HORN
Disconnect the horn and apply voltage to it directly
with a 12 V battery.
Adjust with the adjuster, if necessary.
CHECKING THE HORN BUTTON
Disconnect the button connector.
Using a multimeter with the scale set to ohms, check
the continuity between the contacts in the pressed
and rest positions by testing the connections (MAIN
WIRING DIAGRAM).
6-16
Release 00
2001-03
ch. 6
Electrical system
RS 50
BRAKING LIGHTS CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
G/V
Positive key-controlled
13
36
7
B
V/R
V/R
7) Brake light rear switch
13) Taillight (brake light bulb)
36) Brake light front switch
6
TECHNICAL DATA
Brake lights
bulb ........................................................... 12 V - 21 W
TROUBLESHOOTING
A. BRAKE LIGHT STAYS LIT CONTINUOUSLY
Check the taillight connections.
Check the brake light front switch (CHECKING THE
BRAKE LIGHT FRONT AND REAR SWITCH).
Check the brake light rear switch (CHECKING THE
BRAKE LIGHT FRONT AND REAR SWITCH).
ch. 6
Release 00
2001-03
6-17
Electrical system
RS 50
B. BRAKE LIGHT DOESN’T SWITCH ON
Check the bulb and bulb holder.
Check the wiring connections.
Check the general power supply circuit.
Check the brake light front switch (CHECKING THE
BRAKE LIGHT FRONT AND REAR SWITCH).
Check the brake light rear switch (CHECKING THE
BRAKE LIGHT FRONT AND REAR SWITCH).
CHECK DATA
CHECKING THE BRAKE LIGHT FRONT
AND REAR SWITCH
Brake lightfront switch:
disconnect the 2-way connector.
Brake light rear switch:
lift up the cap and disconnect the terminals.
Operate the brake and test the resistance between
the 2 wires on the connector, using a multimeter with
the scale set to ohms:
Normal value with brake engaged: 0 Ω.
Normal value with brake not engaged: infinity.
6-18
Release 00
2001-03
ch. 6
Electrical system
RS 50
LIGHT CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
From flywheel
16
17
PASS
G/N N Bi
G
11
3
3)
11)
13)
16)
17)
20)
22)
28)
29)
13
29
22
28
20
Regulator
Low beam light
Rear parking light
Right high/low beam selector
Left high/low beam selector
Dashboard light
High beam warning light
High beam light
Front parking light
6
TECHNICAL DATA
High and low beam light
bulb ........................................................... 12 V - 35 W
Rear parking light
bulb ............................................ 12 V - 5 W - BAY 15d
Dashboard light
bulb ......................................... 12 V - 2 W W2.1x9.5 d
all-glass type
High beam
warning light bulb .................... 12 V - 2 W W2.1x9.5 d
all-glass type
Front parking light
bulb ........................................... 12 V - 5 W W2.1x9.5d
all-glass type
ch. 6
Release 00
2001-03
6-19
Electrical system
RS 50
LIGHT CIRCUIT
Location of components see (LOCATION OF COMPONENTS).
WIRING DIAGRAM
17
From flywheel
16
PASS
V
G/N N Bi
G G/N
V
11
3
3)
11)
13)
16)
17)
20)
22)
28)
29)
13
29
20
Regulator
Low beam light
Rear parking light
Right high/low beam selector
Left high/low beam selector
Dashboard light
High beam warning light
High beam light
Front parking light
TECHNICAL DATA
High and low beam light
bulb ........................................................... 12 V - 35 W
Rear parking light
bulb ............................................ 12 V - 5 W - BAY 15d
Dashboard light
bulb ......................................... 12 V - 2 W W2.1x9.5 d
all-glass type
High beam
warning light bulb .................... 12 V - 2 W W2.1x9.5 d
all-glass type
Front parking light
bulb ........................................... 12 V - 5 W W2.1x9.5d
all-glass type
6-20
Release 00
2001-03
ch. 6
22
28
Electrical system
RS 50
TROUBLESHOOTING
A. A LIGHT DOESN’T WORK
Check the bulb.
Check for voltage on the bulb holder terminals.
Check the wiring connections.
B. NONE OF THE LIGHTS WORK
Check the high/low beam selectors.
Check the voltage regulator (CHECKING THE VOLTAGE REGULATOR).
Check the generator (CHECKING THE GENERATOR).
6
C. BULBS BURN OUT FREQUENTLY
Check for excessive vibration on the lights and check
that none of the lights are touching against parts of
the motorcycle without flexible mountings.
Check the wiring connections.
Check the voltage regulator (CHECKING THE VOLTAGE REGULATOR).
ch. 6
Release 00
2001-03
6-21
Electrical system
RS 50
WATER TEMPERATURE SENSOR
TROUBLESHOOTING
A. TEMPERATURE READING TOO LOW
Check the connections.
Check that the green/red wire on the sensor is supplied with power.
Check the coolant thermistor (1).
Check the coolant temperature gauge (2).
1
B. TEMPERATURE READING TOO HIGH
Check the cooling circuit.
Check the connections.
Check the coolant thermistor (1).
Check the coolant temperature gauge (2).
A
CHECK DATA
CHECKING THE WORKING STATE OF THE
COOLANT TEMPERATURE GAUGE
B
Raise up the petrol tank.
Disconnect terminal (B) (black/white wire) from the
thermistor (3).
Connect a 130 Ω resistance (C).
Turn the ignition switch to position “ “.
Check that the pointer (A) goes to the beginning of the
red zone (“Max”), with a tolerance of ±5°.
2
C
CHECKING THE WORKING STATE OF THE THERMISTOR
Drain the cooling system (DRAINING THE COOLING
SYSTEM).
Raise up the petrol tank.
Disconnect terminal (B) (black/white wire) from the
thermistor (1).
Remove the thermistor (1), (see ENGINE WORKSHOP MANUAL n°966 ( ), n°967 ( ), n°968 ( ),
n°969 ( ), n°970 ( ), n°971 ( ).
6-22
Release 00
2001-03
1
ch. 6
3
Electrical system
RS 50
As illustrated in the figure, connect a multimeter (D)
with the scale set to ohms to the thermistor (1).
Immerse the thermistor in a receptacle (F) containing
coolant.
Immerse a thermometer (E) with a range of 0° ±150°C
(32° ± 302°C) in the same receptacle.
Position the receptacle over a burner (G) and slowly
heat the liquid.
Check the temperature reading on the thermometer
and the thermistor reading on the tester.
E
1
D
F
G
Check that the thermistor responds to the temperature
as shown below:
Coolant
temperature °C (°F)
Standard values
(Ω)
60° (140°)
approx. 510 ± 10%
100° (212°)
approx. 130 ± 10%
WARNING
If the values do not change, or if they differ too
much from those in the table, replace the thermistor with a new one.
6
ELECTRICAL CONNECTORS
To disconnect the two electrical connectors, proceed
as follows:
Press the safety catches, if present.
CAUTION
Do not pull on the wires to unplug the two connectors. This will destroy the wires.
Grip the two connectors and unplug them by pulling
them apart.
If there is any dirt, rust, moisture, etc...., clean the
inside of the connector thoroughly with a compressed
air jet.
Make sure that the wires are properly clipped into the
terminals inside the connectors.
NOTE The two connectors can only be plugged
together in one way: make sure they are positioned
correctly.
After plugging the two connectors together, make sure
they are properly connected (if the connectors have
safety catches you will hear the “click” sound).
ch. 6
Release 00
2001-03
6-23
Electrical system
RS 50
BULBS
Read carefully (MAINTENANCE).
CAUTION
Risk of fire. Keep fuel and other flammable substances away from the electrical components.
Before changing a bulb, turn the ignition switch to
the “ ” (OFF) position and wait a few minutes so
that the bulb cools down. Change the bulb wearing clean gloves or using a clean and dry cloth.
Do not leave fingerprints on the bulb, since these may
cause its overheating and consequent breakage.
If you touch the bulb with bare hands, remove any
fingerprint with alcohol, in order to avoid any
damage.
TAKE CARE TO AVOID DAMAGING THE ELECTRIC CABLES.
CHANGING
THE HEADLIGHT BULBS
3
2
1
Read carefully (BULBS).
Position the motorcycle on the stand.
NOTE Before changing a bulb, check the fuse, see
(CHANGING FUSES).
The headlight contains:
one high beam bulb (1) (right side);
one parking light bulb (2) (lower side);
one low beam bulb (3) (left side).
The high and low beam bulbs are identical.
If the low beam is burned out and no spare bulb is
available, it is possible to substitute the high beam
bulb for the low beam bulb.
This should only be done to make it possible to ride a
short distance at night to a shop where a new bulb
can be obtained or home.
CHANGING
PARKING LIGHT BULB
CAUTION
While removing a bulb socket, do not pull on the
wires.
Working from the rear side of the front part of the
fairing, grasp the bulb socket (4), pull it and remove it
from its seat.
Remove the parking light bulb (5) and replace it with
an identical bulb.
6-24
Release 00
2001-03
4
5
ch. 6
Electrical system
RS 50
CHANGING
HIGH BEAM BULB
2
NOTE Remove the bulb sockets one by one in such
a way as to avoid replacing them incorrectly during
reassembly.
If the bulb sockets must all be removed at the same
time, take great care to reassemble them in the proper
position.
1
Working from the rear right side of the front part of the
fairing, pull back the rubber boot (1) with your fingers.
Rotate the bulb socket (2) counterclockwise and
remove it.
Push the bulb (3) toward the back of the socket lightly,
and rotate it counterclockwise.
Remove the bulb from the seat.
3
NOTE Be sure to maintain the same orientation as
the old bulb when you install the new bulb.
Do not force the bulb, it will go easily if it is properly
oriented.
6
CHANGING
LOW BEAM BULB
NOTE Remove the bulb sockets one by one in such
5
a way as to avoid replacing them incorrectly during
reassembly.
6
If the bulb sockets must all be removed at the same
time, take great care to reassemble them in the proper
position.
4
Working from the rear left side of the front part of the
fairing, pull back the rubber boot (4) with your fingers.
Rotate the bulb socket (5) counterclockwise and
remove it.
Push the bulb (6) toward the back of the socket lightly,
and rotate it counterclockwise.
Remove the bulb from the seat.
NOTE Be sure to maintain the same orientation as
the old bulb when you install the new bulb.
Do not try to force the bulb, it will go easily if it is
properly oriented.
ch. 6
Release 00
2001-03
6-25
Electrical system
RS 50
CHANGING
THE FRONT AND REAR
TURN SIGNAL BULBS
Read carefully (BULBS).
NOTE Before changing a bulb, check the fuse, see
(CHANGING FUSES).
Position the motorcycle on the stand.
Unscrew and remove the screw (1).
NOTE While removing the lens, use extra care to be
sure that you do not break the key.
Remove the lens (2).
NOTE Upon reassembly, position the lens correctly
in its seat.
1
4
2
3
CAUTION
Tighten the screw (1) moderately and with care to
avoid damaging the lens.
Push the bulb (3) in slightly and rotate it counterclockwise.
Extract the bulb from its seat.
NOTE Insert the bulb in the bulb socket, carefully
aligning the two bulb pins with their guides in the
socket.
Correctly install a new bulb of the same type.
NOTE If the bulb socket (4) has fallen out of its seat,
replace it correctly, ensuring that the slot in the reflector aligns with the screw hole in the body of the turn
signal lamp.
CHANGING
THE REAR LIGHT BULB
5
Read carefully (BULBS).
NOTE Before changing a bulb, check the fuse, see
(CHANGING FUSES), also check the operation of the
stoplight switches, see (CHECKING THE
SWITCHES).
Position the motorcycle on the stand.
Unscrew and remove the two screws (5).
Remove the lens (6).
6
NOTE Upon reassembly, make sure that the lens
seats properly.
CAUTION
Upon reassembly, do not overtighten the two
screws (5). Overtightening will crack the lens.
To remove the bulb (7), push the bulb slightly forward
and rotate it counterclockwise.
Pull it from its seat.
6-26
Release 00
2001-03
ch. 6
Electrical system
RS 50
NOTE Ensure that the orientation of your replacement bulb is identical to that of the original bulb.
7
Do not try to force the bulb (7), it will fit easily if it is
properly oriented.
ADJUSTING THE
HEADLIGHT BEAM VERTICALLY
NOTE The procedure described her is in compliance with
the Italian standard that establishes the maximum height
of the headlight beam. For motorcycles used in other
countries, you must conform with the local regulations.
To quickly check the correct direction of the beam,
place the motorcycle on flat ground, 10 m (32.81 ft)
away from a wall.
Turn on the low beam, sit on the motorcycle and make
sure that the beam projected on the wall is slightly
under the horizontal line of the headlight (about 9/ 10th
of the total height).
6
To adjust the headlight beam:
Working from the left rear side of the front part of the
fairing, adjust the screw (1) with a short Philips screwdriver.
By SCREWING IT clockwise, you set the beam
higher.
By UNSCREWING IT counterclockwise, you set the
beam lower.
1
ADJUSTING THE
HEADLIGHT BEAM HORIZONTALLY
NOTE The terms “right” and “left” are referred to the
rider seated on the motorcycle in the normal riding
position.
It is possible to adjust the horizontal position both to
the right and to the left.
The adjustment is carried out using shims and adjusting screws which are supplied as a kit. They will be
found in the glove box/ tool kit compartment.
ch. 6
Release 00
2001-03
6-27
Electrical system
RS 50
To adjust the beam:
1
Remove the front part of the fairing, see (REMOVING
THE FRONT PART OF THE FAIRING).
Unscrew and remove the screw (1).
Unscrew and remove the screws (2).
2
2
CAUTION
Handle with care.
Take care not to damage the electric wires.
Loosen the headlight (3).
There are four groups of shims, for four different
degrees of adjustment.
Each shim is marked with the type identification code
(for example: UPPER) and with the group number (for
example: 3°) (see table below).
Adjustment degree
Group
1°
2°
3°
4°
Shim
UPPER
1
UPPER
2
UPPER
3
UPPER
4
Screw
4.2 x 20
4.2 x 20
4.2 x 20
4.2 x 20
Shim
LOWER
1
LOWER
2
LOWER
3
LOWER
4
Screw
4.2 x 20
4.2 x 25
4.2 x 25
4.2 x 30
6-28
Release 00
2001-03
ch. 6
3
Electrical system
RS 50
Depending on the beam adjustment to be carried out,
select:
the group necessary for the adjustment;
the direction (to the right or to the left).
NOTE Do not mix up screws and shims. Use them
only in the proper sets.
Insert the shims in the headlight screw seats as
indicated in figures A and B:
rightwards (figure A);
leftwards (figure B).
Position the headlight (3) in its seat.
Tighten the lower left screw (1).
1
2
3
NOTE Replace the screws (2) with the specific
screws corresponding to each shim.
Keep the screws (2) and shims that you do not use
together in the tool kit, in case further adjustment is
required.
6
2
Tighten the two screws specific for each shim.
Tighten the remaining three screws.
Tighten the three screws.
Replace the front part of the fairing, see (REMOVING
THE FRONT PART OF THE FAIRING).
Make sure that the horizontal adjustment of the headlight beam is correct.
Make sure that the vertical adjustment of the headlight
beam is correct, see (ADJUSTING THE HEADLIGHT
BEAM VERTICALLY).
CHANGE FUSES
Read carefully (SERVICING SCHEDULE).
CAUTION
Do not repair faulty fuses.
Use only recommended fuses. Using fuses of an
improper capacity can cause damage to the
electrical system or an electrical fire, which could
result in total destruction of your motorcycle as
well as injury to you.
NOTE If a fuse blows frequently, there probably is a
short circuit or an overload in the electrical system. If
this occurs, take the motorcycle to your Local aprilia
Dealer.
ch. 6
Release 00
2001-03
6-29
Electrical system
RS 50
If an electric component does not work or works
irregularly, or if the motorcycle fails to start, it is
necessary to check the fuse (1).
1
3
2
To check the fuse:
Turn the ignition switch (2) in the “ ” (OFF) position.
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Remove the fuse (1) and inspect the filament (2).
If it is open, the fuse must be replaced.
Replace the blown fuse with the spare fuse (3), or with
a new fuse having the same amperage rating.
NOTE If you use the spare fuse (3), replace it as
soon as convenient.
FUSE CIRCUIT
A 7.5 amp fuse protects
all of the electrical loads except the lighting circuit,
which is fed with alternating current directly from the
alternator.
6-30
Release 00
2001-03
ch. 6
Electrical system
RS 50
CHECKING THE SWITCHES
Read carefully (SERVICING SCHEDULE).
The motorcycle is equipped with three switches:
Stoplight switch on the rear brake pedal (1);
1
Stoplight switch on the front brake lever (2);
2
6
Safety switch on the side stand (3).
Make sure that there is no dirt or mud on the switch.
The switch pin must move freely and without interference, returning automatically to its unapplied position.
Check that the wires are properly connected.
3
Check the spring (4); it must not be damaged, worn
or stretched.
4
ch. 6
Release 00
2001-03
6-31
Electrical system
RS 50
NOTES
6-32
Release 00
2001-03
ch. 6
Body work
RS 50
7
Body work
ch. 7
Release 00
2001-03
7-1
Body work
RS 50
APPLYING THE TRANSFERS
2
When removing parts of the frame:
3
4
CAUTION
Handle plastic and painted parts carefully so as
not to scratch or damage them.
Perform the work with the utmost care.
Do not damage the tabs and/or the slots into
which they are inserted.
To apply the transfers, carefully follow the instructions
below.
1
The following tools are recommended:
medium-stiff (1) squeegee;
NOTE Generally, soft, squeegee-type spatulas do
not remove enough water from under the transfer.
3
sponge or spray (2) with water.
NOTE Add detergent (1-3%) to the water and shake
or stir to make it foamy.
To apply, proceed as follows:
Position the transfer (3), face down, on a work surface.
Keeping the transfer spread flat on the work surface,
completely remove the backing paper (4).
NOTE You are advised to use a sprayer (2).
If you use a sponge, sponge the surface lightly, to
avoid damaging the adhesive.
Wet the adhesive surface with soapy water.
Apply the transfer (3) to the surface to be decorated,
moving it to the correct position.
NOTE Keep smoothing the transfer with the squeegee with constant movement from the center outwards.
Using the squeegee (1), pressing lightly, smooth away
all excess soap and water from over and under the
transfer.
1
NOTE Do not lift up the corners and/or sides of the
transfer.
Dry the transfer by wiping it from the center outward
with a soft cloth.
Go over the transfer again with the squeegee, pressing down as firmly and evenly as possible in the
movements.
Smooth from the center outwards, making sure that
the whole transfer is properly stuck down, especially
the corners and sides.
7-2
Release 00
2001-03
ch. 7
Body work
RS 50
NOTE The application tape (1), if present, must be
removed 20-30 minutes after the application of the
transfer.
The tape is used in the application of logos and
letters, making it easier to position them correctly on
the surface and helping the glue to set more firmly.
Peel off the application tape (5) from the transfer
surface.
Go over the transfer again with the squeegee to make
sure it has adhered properly, especially the edges and
corners.
5
NOTE With the wet application method, the transfer
takes 48 hours to set properly.
Make sure there are no air bubbles under the surface
after removing the application tape.
If there are any air bubbles, use a sharp pin or cutter
(6) to puncture the edge (7) of the air bubble.
Using the squeegee (1) and starting from the opposite
side to the puncture, smooth down the bubble and
force the air out.
6
7
7
7
ch. 7
Release 00
2001-03
7-3
Body work
RS 50
REMOVING THE RIDER SADDLE
3
Read carefully (SERVICING SCHEDULE).
Position the motorcycle on the stand.
Insert the key (1) in the lock (2).
Rotate the key (1) clockwise.
Raise and remove the saddle (3).
Remove the flap (4).
6
1
2
5
5
Upon reassembly:
Position the flap (4) correctly.
Insert the rear tangs (5) of the saddle in the appropriate seats (see figure).
Lower the saddle and insert the two pins (6) in the
matching seats.
Turn the key (1) counterclockwise, locking the saddle.
4
WARNING
Before riding, make sure that the saddle (3) is
properly positioned and locked: risk of serious
injuries or even death.
REMOVING THE SADDLE LOCK
13
14
Unscrew and remove the screw (7).
From below, remove the washer (8), saddle locking
plate (9), nut (10) and serrated washer (11).
Remove the (12) lock (13) and ring (14) from above
the saddle.
Lift up and remove the saddle (12).
12
11
10
8
7
9
REMOVING THE PASSENGER SADDLE
15
Remove the rear fairing (REMOVING THE REAR
FAIRING).
Stand the rear faring and saddle on a flat surface.
17
16
15
15
WARNING
Be careful not to scratch the rear fairing and
decal.
Slacken and remove the 7 screws (15) that secure the
Passenger saddle (16) to the rear fairing (17).
Separate the passenger saddle (16) from the rear
fairing (17).
Torque setting for screws (1):
2 Nm (0.2 kgm) [1.5 Ft-lb].
7-4
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE SIDE FAIRINGS
Read carefully (SERVICING SCHEDULE).
WARNING
Before carrying out the following operations, let
the engine and the exhaust silencer cool down
until they reach room temperature, in order to
avoid burns.
1
Position the motorcycle on the stand.
Unscrew and remove the four screws (1).
Unscrew and remove the two lower screws (2).
For the left fairing: unscrew and remove the two rear
screws (3).
For the right fairing: unscrew and remove the rear
screw (4).
Unscrew and remove the four screws (5).
5
6
5
7
CAUTION
Handle the plastic and painted components with
care and avoid scraping or damaging them.
Be careful not to damage the electric cables.
Disconnect the two electric terminals (6) of the direction indicator.
Remove the side fairing (7).
3
4
2
7
ch. 7
Release 00
2001-03
7-5
Body work
RS 50
REMOVING THE FUEL TANK
Read carefully (FUEL) and (SERVICING SCHEDULE).
WARNING
Risk of fire.
Wait until the engine and the exhaust silencer
have completely cooled down.
Fuel vapors are poisonous.
Make sure that the room in which you are working
is properly ventilated.
Do not inhale fuel vapours.
Do not smoke and do not use naked flames.
DISPOSE OF UNWANTED FUEL PROPERLY.
1
Move the fuel valve lever (1) to the “OFF” position.
Remove the rider saddle, (REMOVING THE RIDER
SADDLE).
Remove the screw (2) and bushing.
Drain the fuel tank completely, (DRAINING THE FUEL
TANK).
Position an absorbent cloth (3) on the front support of
the seat (4).
2
RES
ON
OFF
5
CAUTION
3
Handle with care.
While removing the fuel tank (5), DO NOT force the
fuel line (6).
Grasp the front part of the fuel tank (5) and lift it
slightly.
Using a pair of pliers, release the clamp (7).
8
7
4
CAUTION
Upon reassembly, be sure that the fuel line (6) and
clamp (7) are properly installed.
Remove the fuel line (6) from the fuel valve (8).
6
WARNING
5
Danger! Some fuel may spill.
Plug the free end of the fuel line (6) and attach it to
the motorcycle with a wire or tape in the vertical
position.
6
3
7-6
Release 00
2001-03
ch. 7
Body work
RS 50
Replace the tank in its working position.
Loosen and remove the nut (9) that holds the bolt
(10).
After removing the nut (9), withdraw the bolt (10) from
its hole, where it fixes the tank to the frame.
Take off the washer (11).
9
11
10
EMPTYING THE FUEL TANK
Read carefully (FUEL).
CAUTION
Fire hazard.
Wait until the engine and exhaust muffler cool
down completely.
Fuel vapors can damage your health.
Before proceeding, make sure there is a suitable
air exchange in the room where you are working.
Do not inhale fuel vapors.
Do not smoke or use naked flames.
DO NOT DISPOSE OF FUELIN DRAINS, WATER
COURSES OR THE SOIL.
WARNING
7
The use of open flames is forbidden for any type of
operation. Before commencing any service or inspection operation on the vehicle, switch off the
engine and remove the key, wait until the engine and
the exhaust system have cooled down and, if possible, raise the vehicle with the suitable equipment
onto firm flat ground.
In order to avoid burns, be careful not to touch any parts
of the engine or exhaust systems which have not cooled
down completely.
WARNING
The exhaust fumes contain carbon monoxide, a
poisonous gas that can cause loss of consciousness
and even death. Work in a well-ventilated area.
Keep cigarettes, flames or sparks away from the work
area and from the place where gasoline is stored.
KEEP GASOLINE AWAY FROM CHILDREN. DO NOT
DISPOSE OF FUEL IN THE ENVIRONMENT.
2
1
Position the motorcycle on the stand.
Stop the engine and wait for it to cool down.
Get a container, big enough to hold the quantity of fuel
remaining in the tank (1), and place it on the ground to
the left of the motorcycle.
Remove the fuel valve (2) and proceed with emptying
the tank.
CAUTION
After emptying the tank, reconnect the fuel valve.
ch. 7
Release 00
2001-03
7-7
Body work
RS 50
REMOVING THE AIR BOX
2
Read carefully (SERVICING SCHEDULE).
Remove the fuel tank (REMOVING THE FUEL TANK).
Unscrew the screw (1) to loosen the clamp (2) on the
intake hose leading to the carburetor.
1
4
Unscrew and remove the screws (3) that secure the
air box (4) to the frame.
3
Torque setting for screws (3):
5 Nm (0.5 kgm) [3.7 Ft-lb].
CAUTION
4
Proceed with great care when removing the air
box.
Lift up the rear end of the air box to withdraw it from
the carburetor and air box support pin (5).
5
WARNING
Plug the openings with a clean cloth, to prevent
foreign bodies getting into the intake tubes.
When refitting, position the air box on the support pins
(5), then insert the intake hose into the carburetor,
secure the box with the screw (3) and tighten the
clamp (2) on the carburetor.
7-8
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING
THE LEFT HANDLEBAR HANDGRIP
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Hold the counterweight (1) while loosening and
removing the screw (2).
Remove the counterweight (1).
2
Insert the point of a compressed air gun between the
handgrip (3) and the handlebar (4).
Blow in air while moving the point of the gun in a
clockwise direction, gripping and removing the
handgrip (3) with the other hand at the same time.
3
4
REMOVING THE LEFT HANDLEBAR
ELECTRICAL CONTROLS
7
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Unscrew the two screws (5) that secure the two half
shells underneath.
Divide the two half shells.
Free the wiring from the clamps that fix it to the frame.
5
5
NOTE Prepare the same number of new clamps for
refitting.
6
Disconnect the left high/low beam selector connector.
WARNING
When refitting, make sure the connector is
plugged in properly.
Remove the two half shells (6-7).
7
ch. 7
Release 00
2001-03
7-9
Body work
RS 50
REMOVING THE CLUTCH CONTROL
1
3 6
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Slide back the boot (1).
Loosen the nut (2) by twisting it until it butts up against
the adjustor (3).
Line up the slots on the nut (2) and adjuster (3) with
the slot (4) on the clutch lever bolt (5).
Pull the clutch cable (6) out and withdraw it from its
housing on the clutch lever (7).
7
5
2
4
Loosen and remove the screw (8).
9
Torque setting for screw (8):
12 Nm (1.2 kgm) [8.8 Ft-lb].
Remove the clutch control (9).
8
7-10
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE THROTTLE CONTROL
2
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Hold the counterweight (1) while loosening and
removing the screw (2).
Unscrew and remove the two screws (3).
4
Torque setting for screws (3):
2 Nm (0.2 kgm) [1.5 Ft-lb].
Remove the upper half shell (4) from the right high/low
beam selector (5).
3
9
Remove the fuel tank (REMOVING THE FUEL TANK).
Unscrew and remove the screws (6) on the carburetor
valve cover.
5
7
7
6
Torque setting for screws (6):
2 Nm (0.2 kgm) [1.5 Ft-lb].
6
Withdraw the throttle control cable (7) from the throttle
valve.
Disconnect the oil pump control cable (8).
Disconnect the throttle control cable and the oil pump
control cable from inside the high/low beam selector
(5).
Withdraw the throttle control (9).
WARNING
When refitting, make sure that the two throttle
control cables are in good condition and fitted
properly.
ch. 7
8
Release 00
2001-03
7-11
Body work
RS 50
REMOVING THE RIGHT HANDLEBAR
ELECTRICAL CONTROLS
2
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
The only operation required is to disconnect the
throttle cable (1) from the block.
Free the wiring from the clamps that fix it to the frame.
3
1
NOTE Prepare the same number of new clamps for
refitting.
Disconnect the electrical connector on the right high/
low beam selector.
Remove the two half shells (2-3).
Make sure the connector is plugged in properly when
refitting.
REMOVING THE STOP SWITCH
4
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Loosen and remove the 2 screws (4).
CAUTION
5
Before removing the stop light switch, put your
hand under it to catch the ball (6) as it falls.
6
Remove the stop switch (5) and catch the ball (6),
unplugging the switch from the electrical connection.
When refitting, make sure the electrical connection is plugged in properly.
7-12
Release 00
4
2001-03
ch. 7
Body work
RS 50
REMOVING THE FRONT BRAKE
CONTROL
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Unscrew and remove the 2 screws (1) that secure the
front brake control (2).
2
1
Torque setting for screws (1):
12 Nm (1.2 kgm) [8.8 Ft-lb].
Loosen and remove the screw (3) that secures the
tube guide clamp (4) on the fork bottom plate, to free
the brake fluid tube (5).
3
5
4
Torque setting for brake caliper screws (6):
22 Nm (2.2 kgm) [16.2 Ft-lb].
8
Unscrew and remove the two screws (6) that secure
the front brake caliper (7).
Withdraw the disc from the brake caliper (7), leaving it
connected to the tube (8).
7
6
7
Remove the front brake control (9), brake fluid reservoir (10) and front brake caliper (7).
8
10
WARNING
9
When refitting, make sure the brake fluid tube (8)
is not pinched.
7
ch. 7
Release 00
2001-03
7-13
Body work
RS 50
2
REMOVING THE RIGHT HANDLEBAR
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Loosen and remove the screw (1).
Remove the washer.
Withdraw the right handlebar (2) with all its controls.
NOTE If necessary, remove the front brake control
(REMOVING THE FRONT BRAKE CONTROL), the
electrical controls (REMOVING THE RIGHT HANDLEBAR ELECTRICAL CONTROLS) and the throttle
control (REMOVING THE THROTTLE CONTROL).
REMOVING THE LEFT HANDLEBAR
4
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Loosen and remove the screw (3).
Remove the washer.
Withdraw the left handlebar (4) with all its controls.
3
NOTE If necessary, remove the handgrip (REMOVING THE LEFT HANDLEBAR HANDGRIP), the
electrical controls (REMOVING THE LEFT HANDLEBAR ELECTRICAL CONTROLS) and the clutch
control (REMOVING THE CLUTCH CONTROL).
7-14
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE IGNITION SWITCH/
STEERING LOCK
3
1
2
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Remove the right and left handlebars (REMOVING
THE RIGHT HANDLEBAR, REMOVING THE LEFT
HANDLEBAR).
Free the fork top plate, following the instructions in the
chapter ADJUSTING THE PLAY OF THE BEARINGS.
Free the wiring from the clamps.
NOTE Prepare the same number of new clamps for
refitting.
Disconnect the ignition switch/steering lock electrical
connector.
WARNING
When refitting, make sure the connector is
plugged in properly.
Unscrew and remove the screw (1).
Use a chisel to cut into the head of the special screw
(2) and turn it until it loosens.
Unscrew and remove the screw (2) with your fingers.
NOTE When refitting, use a new screw of the same
type; tighten it up until the head shears off.
7
Remove the ignition switch/steering lock (3), withdrawing it from underneath.
REMOVING THE REAR VIEW MIRRORS
8
Position the motorcycle on the stand.
Slacken and remove the nut (4) and take off the
washer (5), spring (6) and ball fitting (7).
WARNING
Handle plastic and painted parts carefully, without
scraping or damaging them.
9
7
6
Remove the rear view mirror (8).
Take off the cap (9), if it has come out of its housing.
5
4
ch. 7
Release 00
2001-03
7-15
Body work
RS 50
NOTE Repeat the same steps to remove the other
rear view mirror.
NOTE After refitting, set the rear view mirrors correctly and tighten up the nuts to make sure they are
securely fixed.
REMOVING THE WINDSHIELD
1
Position the motorcycle on the stand.
Using a screwdriver (1), remove the 7 studs (2) that
secure the windshield (3) to the front mounting (4).
Remove the windshield (3).
4
3
NOTE Proceed carefully, without damaging the
plastic parts.
2
REMOVING THE FRONT FAIRING
6
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Remove the rear view mirrors (REMOVING THE
REAR VIEW MIRRORS).
Loosen and remove the 3 external screws (5) from the
right of the front fairing (6).
5
Torque setting for screws (5):
5 Nm (0.5 kgm) [3.7 Ft-lb].
Loosen and remove the internal screw (7).
Torque setting for screw (7):
1 Nm (0.1 kgm) [0.7 Ft-lb].
NOTE The dashboard closing cowl has to be removed in order to remove the left side of the front
fairing (REMOVING THE FILLER CAP).
7
7-16
Release 00
2001-03
ch. 7
Body work
RS 50
Move the front fairing (8) slightly forward.
Disconnect the headlight electrical connector (9).
NOTE When refitting, make sure the connector (9) is
plugged in properly.
Handle plastic and painted parts carefully, to avoid
scraping or damaging them.
8
Remove the headlight (REMOVING THE HEADLIGHT).
9
REMOVING THE HEADLIGHT
1
1
2
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Remove the front fairing (REMOVING THE FRONT
FAIRING).
Loosen and remove the screws (1).
Remove the headlight (2).
1
NOTE Handle plastic and painted parts carefully,
without scraping or damaging them.
When refitting, make sure the headlight connector (9)
is plugged in properly.
7
REMOVING THE DASHBOARD
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the front fairing (REMOVING THE FRONT
FAIRING).
Loosen the ring nuts (3) on the odometer cable (4)
and tachometer cable (5).
Withdraw the 2 cables.
Disconnect the dashboard (6) electrical connections.
ch. 7
6
3
4
3
5
Release 00
2001-03
7-17
Body work
RS 50
NOTE Make sure the electrical connections are
6
correct when refitting.
7
7
Loosen and remove the 3 self-locking nuts (7) and
washers.
Torque wrench setting for nut (7):
10 Nm (1 kgm) [7.4 Ft-lb].
Remove the dashboard (6).
NOTE Replace the rubber pads, if damaged.
7
REMOVING THE INSTRUMENT PANEL
FRAME
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Remove the front fairing (REMOVING THE FRONT
FAIRING).
Remove the dashboard (REMOVING THE DASHBOARD).
Free the instrument panel frame (1) from the wiring (2)
by cutting the clamps (3).
4
3
CAUTION
When refitting, replace the clamps (3) with new
ones.
Loosen and remove the 2 screws (4), taking off the
corresponding self-locking flanged nuts from the other
side.
Torque setting for screws (4):
15 Nm (1.5 kgm) [11.1 Ft-lb].
7-18
Release 00
2001-03
ch. 7
2
Body work
RS 50
REMOVING THE FRONT MUDGUARD
1
4
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Loosen and remove the 4 screws (1).
Torque setting for screws (1):
7 Nm (0.7 kgm) [5.2 Ft-lb].
2
Remove the self-locking nuts (2).
Loosen and remove the 2 screws (3) (right and left).
Torque setting for screws (3):
5 Nm (0.5 kgm) [3.7 Ft-lb].
3
WARNING
Handle plastic and painted parts carefully, without
scraping or damaging them.
Withdraw the front mudguard (4) by grasping it from
the front.
REMOVING THE FRONT DIRECTION
INDICATORS
7
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Switch the ignition key to the “ “ position.
Remove the side fairings (REMOVING THE SIDE
FAIRINGS).
Loosen and remove the screw (5) (right and left).
Take the corresponding nuts off from behind.
Remove the direction indicator (6).
5
6
WARNING
When removing the direction indicator (6), bring
the electric wire and its connector out through the
slot in the fairing.
ch. 7
Release 00
2001-03
7-19
Body work
RS 50
REMOVING THE LOWER FAIRING
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
WARNING
Handle plastic and painted parts carefully, without
scraping or damaging them.
Position the motorcycle on the rear stand .
WARNING
Wait until the engine and exhaust muffler have
cooled down completely.
Loosen and remove the 7 screws (1).
1
Torque setting for screws (1):
3 Nm (0.3 kgm) [2.2 Ft-lb].
2
1
Remove the internal fairings (2).
WARNING
Repeat the procedure to remove the other fairing.
1
1
Loosen and remove the 8 screws (3).
3
Torque setting for screws (3):
3 Nm (0.3 kgm) [2.2 Ft-lb].
4
Remove the saddle cowl (4).
3
3
Loosen and remove the 3 screws (5).
5
Torque setting for screws (5):
3 Nm (0.3 kgm) [2.2 Ft-lb].
5
Lower the side stand.
Remove the left fairing panel extension (6).
6
7-20
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE REAR FAIRING
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
WARNING
Wait until the engine and exhaust muffler cool
down completely.
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Loosen and remove the nut (1) that attaches the
passenger saddle to the rear fairing.
Torque setting for nut (1):
2 Nm (0.2 kgm) [1.5 Ft-lb].
1
Loosen and remove the pillion seat strap nut (2).
Torque setting for nut (2):
5 Nm (0.5 kgm) [3.7 Ft-lb].
2
Loosen and remove the two screws (3).
Torque setting for screws (3):
3 Nm (0.3 kgm) [2.2 Ft-lb].
5
NOTE Repeat the operation for nuts (1) and (2) and
3
screws (3) on the right-hand side of the motorcycle.
4
Loosen and remove the 4 screws (4) that attach the
passenger saddle to the rear fairing.
Torque setting for screws (4):
3 Nm (0.3 kgm) [2.2 Ft-lb].
Remove the rear fairing (5).
NOTE If necessary, remove the passenger saddle
(REMOVING THE PASSENGER SADDLE).
4
ch. 7
Release 00
2001-03
7-21
7
Body work
RS 50
REMOVING THE REAR LIGHT
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Switch the ignition key to the “ “ position.
Carry out the procedure for changing the rear light
bulb (CHANGING THE REAR LIGHT BULB).
Withdraw and slightly loosen the reflector (1).
Disconnect the bulb electrical connection (2).
Remove the reflector (1).
Loosen and remove the 2 retainer screws (3).
Torque setting for screws (3):
2 Nm (0.2 kgm) [1.5 Ft-lb].
1
3
2
4
Remove the taillight support (4).
NOTE When reassembling, tighten the two screws
(3) carefully and moderately, to avoid damaging the
taillight support (4).
REMOVING THE LICENSE PLATE
HOLDER
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Switch the ignition key to the “ “ position.
Remove the rear fairing (REMOVING THE REAR
FAIRING).
Remove the taillight (REMOVING THE REAR LIGHT).
Remove the rear direction indicators (REMOVING
THE REAR DIRECTION INDICATORS).
6
Loosen and remove the 3 screws (5).
Remove the three self-locking nuts (6).
Remove the license plate holder (7) from the pillar
lower closing cowl (8).
7
8
5
7-22
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE PILLAR COVER
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Raise up the tank (RAISING THE FUEL TANK).
Loosen and remove the 4 screws (1).
WARNING
Handle plastic and painted parts carefully, without
scraping or damaging them.
Remove the pillar cover (2).
Proceed in the same way for the right-hand pillar
cover.
1
2
1
REMOVING THE REAR TURN SIGNALS
7
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rear fairing (REMOVING THE REAR
FAIRING).
Disconnect the electrical connections (3).
3
WARNING
When refitting, make sure the electrical connector
(3) is plugged in properly.
Loosen and remove the screws (4).
Take off the nuts (5).
Remove the turn signals (6).
NOTE When removing the turn signal (6), bring the
4
4
6
6
electric wire and its connector out through the slot in
the pillar lower closing cowl and license plate holder.
5
ch. 7
Release 00
5
2001-03
7-23
Body work
RS 50
REMOVING THE REAR MUDGUARD
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
WARNING
Wait until the engine and exhaust muffler cool
down completely.
Loosen and remove the 2 screws (1).
1
Torque setting for screws (1):
5 Nm (0.5 kgm) [3.7 Ft-lb].
Remove the rear mudguard (2).
2
1
REMOVING THE REAR FOOTREST
SUPPORTS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
CAUTION
Wait until the engine and exhaust muffler cool
down completely.
Loosen and remove the screw (3) (r.h. side footrest
only).
Torque setting for screws (3):
12 Nm (1.2 kgm) [8.8 Ft-lb].
3
7-24
Release 00
2001-03
ch. 7
Body work
RS 50
Loosen and remove the screws (4) under the pillar
cover.
5
Torque setting for screws (4):
24 Nm (2.4 kgm) [17.7 Ft-lb].
Remove the footrest support (5) complete with footrest.
If necessary, remove the footrest (5) (REMOVING
THE REAR FOOTRESTS).
4
REMOVING THE REAR FOOTRESTS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
CAUTION
Wait until the engine and exhaust muffler cool
down completely.
Remove the retainer ring (1).
Withdraw the pin (2).
7
WARNING
Be careful not to lose the ball (3) pushed out by
the spring (4).
2
3
Remove the footrest (5) and take off the shim (6), ball
(3) and spring (4).
6
4
5
NOTE If necessary, repeat the procedure for the
removal of the otherfootrest.
1
REMOVING THE FRONT FOOTREST
SUPPORT (LEFT SIDE)
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
CAUTION
Wait until the engine and exhaust muffler cool
down completely.
ch. 7
Release 00
2001-03
7-25
Body work
RS 50
Remove the shift lever (1) (REMOVING THE SHIFT
LEVER).
3
Loosen and remove the screws (2).
Torque setting for screws (2):
25 Nm (2.5 kgm) [18.4 Ft-lb].
2
Remove the front footrest support (3) complete with
footrest (4).
If necessary, remove the front footrest (4) (REMOVING THE FRONT FOOTREST).
4
1
REMOVING THE FRONT FOOTREST
SUPPORT (RIGHT SIDE)
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
CAUTION
Wait until the engine and exhaust muffler cool
down completely.
Remove the brake pedal (5) (REMOVE THE BRAKE
PEDAL).
Loosen and remove the screws (6).
Torque setting for screw (6):
10 Nm (1.0 kgm) [7.4 Ft-lb].
7
6
10
Temporarily attach the rear brake master cylinder (7)
to the frame in a vertical position, using adhesive
tape.
8
5
9
Loosen and remove the screws (8).
Torque setting for screws (8):
25 Nm (2.5 kgm) [18.4 Ft-lb].
Remove the front footrest support (9), complete with
footrest.
If necessary, remove the front footrest (10) (REMOVING THE FRONT FOOTREST).
7-26
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE FRONT FOOTREST
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
CAUTION
Wait until the engine and exhaust muffler cool
down completely.
Remove the retainer ring (1).
Withdraw the pin (2).
Take off the footrest (3) and the spring (4).
2
NOTE If necessary, repeat the procedure to remove
the other front footrest.
4
3
1
REMOVING THE SHIFT LEVER
7
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Loosen and remove the nut (5).
Torque setting for nut (5):
5 Nm (0.5 kgm) [3.7 Ft-lb].
5
Loosen and remove the gear shift lever (6).
9
Torque setting for shift lever pin (6):
12 Nm (1.2 kgm) [8.8 Ft-lb].
8
7
Remove the 2 Belleville washers (7), the washer (8)
and the nut (9).
Remove the shift lever (10).
6
10
ch. 7
Release 00
2001-03
7-27
Body work
RS 50
REMOVING THE BRAKE PEDAL
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Loosen and remove the nut (1).
Torque setting for nut (1):
5 Nm (0.5 kgm) [3.7 Ft-lb].
1
Release the spring (2).
Loosen and remove the brake lever pin (3).
4
3
Torque setting for brake lever pin (3):
12 Nm (1.2 kgm) [8.8 Ft-lb].
5
6
Remove the 2 Belleville washers (4), the washer (5)
and the nut (6).
Remove the brake pedal (7).
To refit, go through the removal procedure in reverse
order, adjusting the rear brake if necessary (ADJUSTING THE REAR BRAKE).
7
2
REMOVING THE EXHAUST PIPE
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
The exhaust pipe and muffler must be cleaned every
4,000 km (2,500 miles).
CAUTION
It is against the law to use the motorcycle without
an exhaust pipe and/or muffler.
It is also against the law to replace these parts
with non-approved spare parts.
NOTE Before proceeding, allow the engine and
exhaust to cool down to ambient temperature, to avoid
possible burns.
Remove the side fairings (REMOVING THE THE
SIDE FAIRINGS).
Remove the saddle cowl (REMOVING THE LOWER
FAIRING).
Unhook the 2 springs (8) that attach the exhaust pipe
to the cylinder exhaust manifold.
8
CAUTION
Check the state of the 2 springs (8), replacing
them if damaged.
7-28
Release 00
2001-03
ch. 7
Body work
RS 50
Loosen and remove the screw (9).
Torque setting for screw (9):
12 Nm (1.2 kgm) [8.8 Ft-lb].
Take off the washer (10).
10
9
The exhaust pipe must be supported during this
operation.
Loosen and remove the screw (11).
Torque setting for screw (11):
12 Nm (1.2 kgm) [8.8 Ft-lb].
13
11
12
Take off the washer (12).
WARNING
Plug the exhaust pipe opening, to prevent foreign
material from entering.
Withdraw the exhaust pipe (13) in a downward direction.
Clean if necessary (CLEANING THE EXHAUST PIPE
AND MUFFLER).
ch. 7
7
Release 00
2001-03
7-29
Body work
RS 50
REMOVING THE MUFFLER
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (SERVICING SCHEDULE).
The exhaust pipe and muffler must be cleaned every
4,000 km (2,500 miles).
WARNING
It is against the law to use the motorcycle without
an exhaust pipe and/or muffler.
It is also against the law to replace these parts
with non-approved spare parts.
CAUTION
Before proceeding, allow the engine and exhaust
to cool down to ambient temperature, to avoid
possible burns.
Unscrew and remove the screw (1) and take off the
washer.
Take off the support (2).
3
2
6
WARNING
Support the muffler (3) to stop it from falling
accidentally.
7
1
Loosen and remove all three nuts (4); unscrew them
and remove them.
5
4
NOTE When refitting, replace all three nuts (4), and
snug them finger tight. Then, tighten to the specified
torque.
Withdraw the muffler (3) from the flange (5).
8
4
NOTE When refitting, insert the exhaust muffler (3)
into the flange (5), checking that the end of the pipe
(6) is pointing down.
Remove the gasket (7).
NOTE When refitting, replace the gasket (7) with a
new one.
Clean any deposits off the flange (5) and the gasket
seat (8).
WARNING
Plug the exhaust pipe space opening, to prevent
foreign material from entering.
7-30
Release 00
2001-03
ch. 7
Body work
RS 50
CLEANING THE EXHAUST PIPE
AND MUFFLER
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (SERVICING SCHEDULE).
Remove the exhaust muffler (REMOVING THE
MUFFLER).
NOTE Get a flexible tube brush (1) of suitable
3
diameter.
4
CAUTION
Do not use any other tool except the tube brush.
Do not insert any objects, especially small objects, into the exhaust pipe or muffler. They will
stay inside, you won’t be able to get them out.
Be careful not to push the brush too far into the
muffler.
Observe the distances that the brush may be
inserted into the muffler safely, given below.
A
2
1
Apply a reference mark (2) to the tube brush (such as
colored sticky tape) to mark the maximum cleaning
depth.
Depthto be marked on tube brush:
A) = 320 mm (12.6 in); B) = 125 mm (4.9 in); C) = 250
mm (9.8 in)
A B C
5
7
9
7
NOTE When you have finished cleaning, remove
your tape, and throughly clean the brush.
8
B
Observing cleaning depth (A), insert the brush and
work it vigorously into the flange hole (3).
6
C
NOTE Work the tube brush in and out in a straight line.
Clean the end of the exhaust pipe (4) with the tube
brush.
NOTE For the next cleaning operations, position the
muffler (5) vertically and insert the tube brush from
underneath.
Observing the cleaning depth (B): insert the tube
brush in the entry hole (6).
Clean the entry pipe (7) with the tube brush.
Rotate the muffler 180°.
Observing the cleaning depth (C): insert the tube
brush into the outlet hole (8).
Clean the outlet pipe (9) with the tube brush.
ch. 7
Release 00
2001-03
7-31
Body work
RS 50
REMOVING THE SIDE STAND
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the rear stand .
Rear stand: 8705021.
WARNING
The sidestand is equipped with a very powerful
spring. If you should get a finger wedged between
the spring and the stand, or between the spring
and the frame, you will be seriously injured.
Take great care when performing this task.
Wear heavy work gloves.
Unhook the two springs (1) with a spring removal
tool, as shown.
WARNING
When refitting, make sure the 2 springs (1) are
positioned correctly.
Remove the stand return plate (2).
2
Work with the stand in the rest position.
Loosen and remove the screw (3).
1
3
Torque setting for screws (3):
25 Nm (2.5 kgm) [18.4 Ft-lb].
Remove the retainer nut (4) from the other end of the
screw (3).
Remove the stand (5).
4
7-32
Release 00
2001-03
5
ch. 7
Body work
RS 50
REMOVING THE CHAIN GUIDE
2
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the swing arm (REMOVING THE SWING
ARM).
Loosen and remove the screw (1).
Torque setting for screw (1):
3 Nm (0.3 kgm) [2.2 Ft-lb].
Remove the cap (2).
Remove the chain guide (3).
3
1
REMOVING THE PILLAR
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the fairings (REMOVING THE SIDE FAIRINGS).
Position the motorcycle on the stand.
Remove the rider saddle (REMOVING THE RIDER
SADDLE).
Remove the fuel tank (REMOVING THE FUEL TANK).
Remove the battery (REMOVING THE BATTERY).
Remove the rear fairing with the passenger saddle
(REMOVING THE REAR FAIRING).
Remove the pillar cover (REMOVING THE PILLAR
COVER).
Remove the rear footrest supports (REMOVING THE
REAR FOOTREST SUPPORTS).
Remove the pillar support lower closing cowl with the
license plate holder and taillight (REMOVING THE
PILLAR SUPPORT LOWER CLOSING COWL).
Remove the two stroke oil tank (REMOVING THE 2
STROKE OIL TANK).
7
Cut off and discard the clamps (4) that secure the
wiring to the pillar.
7
6
NOTE Get new clamps (4) for refitting.
Disconnect the fuse electrical connections (5).
When refitting, make sure the electrical connection is
properly connected.
Remove the rubber fuse holder (6) with its fuses (7).
ch. 7
5
4
Release 00
2001-03
7-33
Body work
RS 50
Loosen and remove the screw (8).
Torque setting for screw (8):
3 Nm (0.3 kgm) [2.2 Ft-lb].
9
Tape or wire the brake fluid reservoir (9) in a vertical
position on the frame to prevent the brake fluid from
spilling out.
8
Loosen and remove the screw (10).
Torque setting for screw (10):
5 Nm (0.5 kgm) [3.7 Ft-lb].
10
Loosen and remove the screw (11) and withdraw the
rear shock absorber from its housing.
Torque setting for screw (11):
48 Nm (4.8 kgm) [35.4 Ft-lb].
12
11
Remove the washer (12) and nut.
Loosen and remove the nut (13).
Torque setting for nut (13):
24 Nm (2.4 kgm) [17.7 Ft-lb].
13
Withdraw the mounting bolt that secures the engine to
the frame.
7-34
Release 00
2001-03
ch. 7
Body work
RS 50
NOTE The following operation must be performed
from the opposite side of the motorcycle.
15
Loosen and remove the 2 screws (14) and (15).
Torque setting for screw (14):
24 Nm (2.4 kgm) [17.7 Ft-lb].
Torque setting for screw (15):
47 Nm (4.7 kgm) [34.7 Ft-lb].
14
Withdraw the pillar (16) rearward.
16
7
ch. 7
Release 00
2001-03
7-35
Body work
RS 50
FRONT WHEEL
1
2
3
4
5
6
5
7
8
9
Key
1)
2)
3)
4)
5)
6)
7)
8)
9)
Axle
Odometer drive cover
Odometer drive
Washer
Bearing
Internal spacer
External spacer
Washer
Nut
7-36
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING
THE COMPLETE FRONT WHEEL
Read carefully (SERVICING SCHEDULE).
While disassembling and reassembling the wheel,
pay extra care not to damage the brake lines,
discs or pads.
NOTE You must use the appropriate front and rear
support stands to remove the front wheel.
Rear stand: 8705021.
Position the motorcycle on the appropriate rear
support stand, (POSITIONING THE MOTORCYCLE
ON THE REAR SUPPORT STAND
).
WARNING
3
7
Make sure that the motorcycle is stable.
Brake caliper screw (1) tightening torque:
16.2 Ft-lb (2.2 kgm) [22 Nm].
1
Remove the two screws (1) that fasten the front brake
caliper (2).
Remove the brake caliper (2) from the disc, leaving it
attached to its line (3).
2
CAUTION
Never touch the front brake lever after removing
the brake caliper from the disc. If you do, the
caliper pistons may be pushed out of their seats,
and brake fluid will be spilled.
Place a support (4) under the tire, in such a way as to
keep the wheel in its position after loosening it.
4
ch. 7
Release 00
2001-03
7-37
Body work
RS 50
Prevent the axle (5) from rotating with an appropriate
Allen wrench.
Remove the nut (6) and washer (7).
12
Wheel nut (6) tightening torque:
59 Ft-lb (8 kgm) [80 Nm].
11
Loosen the axle clamp screw (8), using the appropriate Allen wrench.
Push the axle (5) partly out of the front fork by tapping
the threaded end with a rubber hammer or wooden
drift.
5
10
NOTE Observe the arrangement of the speedometer
8
drive (9) and of the spacer ring (10), in order to be
able to reassemble them correctly.
Support the front wheel and remove the axle manually.
Remove the spacer ring (10).
Remove the wheel by pulling it forward.
Disconnect the speedometer drive (9).
Remove the washers (11).
Remove the speedometer drive cover (12).
6
9
7
DISASSEMBLING THE FRONT WHEEL
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the wheel (REMOVING THE COMPLETE
FRONT WHEEL).
Clean both sides of the hub with a clean cloth.
Using the correct drift, gently tap out the right bearing
(1) and the left bearing (2).
3
NOTE Each time they are disassembled the bearings must be checked (CHECKING THE COMPONENTS) and replaced with new ones if necessary.
Remove the spacer (3).
Clean the inside of the hub thoroughly.
NOTE Wash all components with clean fire proof
solvent.
7-38
Release 00
2001-03
ch. 7
2
Body work
RS 50
WARNING
When refitting the bearings, use a drift with the
same diameter as the outside race of the bearings.
Do not drive on the balls and/or the inner ring.
1
Make sure the following parts are fitted together
perfectly:
the right bearing (1) against the hub;
the spacer (3) against the right bearing (1);
the left bearing (2) against the spacer (3).
3
2
WARNING
Check the condition of all the components, especially those listed below.
BEARINGS
Turn the internal race (1) manually; it must turn
smoothly, without sticking and/or noise.
There must be no end play.
Any bearings not meeting these requirements must be
renewed.
WASHERS
7
Check the condition of the washers, renewing them if
damaged.
AXLE
Using a dial gauge, check the runout on the axle (4). If
the runout exceeds the specified limit, renew it.
Maximum runout: 0.25 mm (0.01 in).
4
ch. 7
Release 00
2001-03
7-39
Body work
RS 50
RIM
Using a dial gauge, check that the radial runout (A)
and axial runout (B) on the rim (5) do not exceed the
specified limits.
Excessive runout is usually caused by worn or damaged bearings.
If, after replacing the bearings, the runout is still not
within the stated limit, replace the rim (5).
Maximum radial and axial runout: 2 mm (0.08 in).
A
B
TIRE
Check the condition of the tire (TIRES).
5
REASSEMBLY FRONT WHEEL
4
5
Read carefully (SERVICING SCHEDULE).
2
Apply a thin film of lubricating grease to the front axle
(1), (LUBRICANT CHART).
Install washer (2) on the speedometer drive (3) (boss
side (4).
Position the boss (4) of the speedometer drive (3) in
the appropriate seat on the wheel hub.
Locate the cover (5) over the speedometer drive (3).
Position the spacer ring (6) in its seat on the wheel.
Position the wheel between the fork rods on the
support (7).
1
3
7
WARNING
Danger of injury. Keep your fingers clear.
Do not attempt to line up the wheel and the axle
clamps with your fingers. Failure to observe this
warning can lead to amputation of a finger or
other serious injury.
Move the wheel around until the axle hole and the
axle clamps are aligned.
Push in the axle (1) completely.
Install the washer (8) and nut (9). Tighten finger tight.
Ensure that the cover (5) is correctly installed on the
fork.
Prevent the axle (1) from rotating using the Allen
wrench.
Tighten the nut (9) to its appropriate tightening torque.
9
Nut (9) tightening torque:
59 Ft-lb (8 kgm) [80 Nm].
8
7-40
Release 00
2001-03
6
ch. 7
Body work
RS 50
CAUTION
While reassembling the wheel, be careful not to
damage the brake line, the disc and the pads.
11
Install the brake caliper (10) over the disc and position
it so that its fastening holes and the holes on the
support are aligned.
NOTE When reassembling the brake caliper, replace
the caliper screws (11) with two new screws of the
same type.
Tighten the two screws (11) to the appropriate torque.
Brake caliper screw (11) tightening torque:
16.2 Ft-lb (2.2 kgm) [22 Nm].
10
Remove the front support stand .
Remove the rear support stand .
Apply the front brake lever, and then push down on
the handlebars, compressing the fork springs several
times. This will align the fork tubes.
Tighten the axle clamp screw (12).
Screw (12) tightening torque:
5.9 Ft-lb (0.8 kgm) [8 Nm].
12
WARNING
7
After servicing the brakes, always check them for
function.
It may be necessary to have your dealer bleed the
system, or there may be some other problem with
the brake system.
Never ride your motorcycle in traffic immediately
after servicing the brakes. Always apply the brake
pedal or lever several times before riding your
motorcycle.
Then, try your motorcycle in a parking lot or other
safe area with little traffic to ensure that the
brakes are working properly. Failure to observe
this warning can lead to a serious accident with
subsequent serious injury or death.
ch. 7
Release 00
2001-03
7-41
Body work
RS 50
FRONT BRAKE
1
3
2
4
7
5
8
9
6
Key
1)
2)
3)
4)
5)
6)
7)
8)
9)
Brake lever
Front brake master cylinder
Brake fluid reservoir
Brake light switch
Master cylinder-to-caliper brake line
Brake caliper
Bleeder screw
Brake pads
Brake disc
7-42
Release 00
2001-03
ch. 7
Body work
RS 50
CHANGING
THE FRONT BRAKE PADS
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (CHECKING THE WEAR ON
THE BRAKE PADS).
Position the motorcycle on the stand.
Using a hex wrench, loosen and remove the screws
(1) that secure the pads to the front brake caliper.
Loosen and remove the brake caliper screws (2).
Torque setting for brake caliper screws (2):
22 Nm (2.2 kgm) [16.2 Ft-lb].
2
Remove the front brake caliper (3) and remove the
pads manually (4).
4
7
WARNING
Never touch the front brake lever after removing
the brake caliper from the disc. If you do, the
caliper pistons may be pushed down in their seats
and brake fluid will be spilled.
Fit the 2 new pads, positioning them so that the holes
are aligned with the holes in the caliper.
3
WARNING
Always replace both pads and make sure they are
correctly positioned in the caliper.
Reinsert the screws (1) that secure the pads to the
front brake caliper (3), without tightening them.
Reassemble the front brake caliper, securing it with
the screws (2).
Fully tighten the screws (1).
Check the brake fluid level (CHECKING AND TOPPING UP THE BRAKE FLUID).
ch. 7
Release 00
2001-03
7-43
Body work
RS 50
REMOVING THE FRONT BRAKE MASTER
CYLINDER
See (REMOVING THE FRONT BRAKE CONTROL).
REMOVING THE BRAKE DISC
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the front wheel (REMOVING THE COMPLETE FRONT WHEEL).
1
1
NOTE It is helpful to use an impact wrench to loosen
the bolts (1), since they are locked in place using
LOCTITE®.
Unscrew and remove the 5 brake disc bolts (1).
WARNING
When refitting, apply LOCTITE® to the brake disc
bolt (1) threads.
D
A
NOTE When refitting, screw in all the bolts (1)
manually and then tighten them up in diagonal order,
i.e.: A-B-C-D-E.
Remove the brake disc (2).
B
C
E
2
CHECKING THE BRAKE DISCS
NOTE Checking the brake disc for warpage must be
done with the brake discs installed on the wheel.
Using a dial gauge, check the maximum misalignment
of the brake disc. If it exceeds the limits, it must be
renewed (see REMOVING THE BRAKE DISC).
Check the wear of the disc by measuring the minimum
thickness at various points around the disc with a
micrometer.
If the disc is less than the specified minimum thickness at any point, renew the disc (see REMOVING
THE BRAKE DISC).
Minimum disc thickness: 3.5 mm (0.14 in).
7-44
Release 00
2001-03
ch. 7
Body work
RS 50
FRONT FORK
7
1
8
9
10
11
12
2
3
4
13
5
7
6
14
15
Key
1) Circlip
2) Tube plug
3) O-ring
4) Spring
5) Complete plunger
6) End bumper
7) Fork tube
8) Dust cover
9) Retainer ring
10) Ring seal
11) Cap
ch. 7
12) Sliding bush
13) Slider
14) Seal washer
15) Oil drain screw
Release 00
2001-03
7-45
Body work
RS 50
REMOVING THE FRONT FORK
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the fairings (REMOVING THE SIDE FAIRINGS).
Remove the saddle cowl (REMOVING THE LOWER
FAIRING).
Remove the front wheel (REMOVE THE COMPLETE
FRONT WHEEL).
Remove the front mudguard (REMOVING THE
FRONT MUDGUARD).
CAUTION
Always place a support of suitable size under the
motorcycle before removing a fork, to stop the
motorcycle from overturning.
NOTE Make sure there is enough space under the
motorcycle to allow the front fork to be removed.
Loosen and remove the screw (1).
Torque setting for screw (1):
5 Nm (0.5 kgm) [3.7 Ft-lb].
1
Remove the fork tube plugs (2).
2
3
NOTE Before removing both the screws (3), support
the fork to stop it from falling accidentally and being
damaged.
Loosen the screws (3).
Withdraw the fork (4) through the top plate and the
bottom plate of the fork head.
NOTE The front brake caliper must be removed from
the slider before removing the fork.
4
7-46
Release 00
2001-03
ch. 7
Body work
RS 50
DISASSEMBLING THE FORK
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (FORK OIL).
NOTE The right and left fork legs have the same
internal components. The procedure described below
refers to a single fork, but is applicable to both.
Remove the front fork (REMOVING THE FRONT
FORK).
Clean the fork thoroughly.
2
NOTE Before proceeding with the operations described below, set up a vice with jaws (A) made of soft
material, a screw (B) with M4 thread and a container
to collect the oil, with a capacity greater than 350 cm3
(12 US fl oz).
CAUTION
Take great care when disassembling the fork.
Loosen and remove the screw (1) that attaches the
fork to the wheel axle.
1
Position the fork (2) in a vice between the 2 jaws (A)
and tighten the jaws moderately.
While depressing the tube plug (3) using a drift, pry
out the circlip (4) with a screwdriver.
Remove thecirclip (4) and release the fork plug (3).
7
4
3
2
A
CAUTION
The fork contains oil; do not turn it upside down
or tilt it too much during the disassembly.
Screw the screw (B) into the tube plug (3) a couple of
turns.
Remove the tube plug (3) and the O-rings (4) by
pulling on the screw (B).
ch. 7
3
B
4
Release 00
2001-03
7-47
Body work
RS 50
NOTE Before completely removing the spring (5),
hold it just out of the tube (6) for a few seconds so that
part of the oil runs down into the tube.
Remove the spring (5).
5
6
A
Turn the fork upside down and pour the oil out into a
container (7). This takes several seconds, be patient.
7
Place the fork in the vice between the 2 jaws (A),
gripping the slider.
Using a socket wrench (8), loosen and remove the
plunger retainer screw (9).
Remove the copper washer (10).
10
9
8
Remove the dust cover seal (11) by prying it off evenly
with a screwdriver. Be careful not to distort the slider
or to scratch the fork tube.
7-48
Release 00
2001-03
11
ch. 7
Body work
RS 50
NOTE The following operation requires the application of considerable force.
Withdraw the fork tube (6) complete with plunger (12)
end bumper (13).
6
CAUTION
Do not disassemble the plunger (3).
Remove the dust cover (11) (see previous figure) from
the tube (6).
12
13
Using a blade screwdriver, remove the retainer ring
(14) by prying in the notch formed in the ring (15).
14
15
NOTE Reposition the slider in the vice between the 2
jaws (A).
Place a piece of rubber (B) on the rim of the slider to
stop damaging it in the next operation.
Using a blade screwdriver, remove the oil seal (16) by
prying at different points around the circumference.
7
16
B
A
CAUTION
Be extra careful to avoid damaging the upper lip
of the slider. It is made of relatively soft alluminum
and can easily be destroyed if you are not careful.
Remove the cap (17) and then the sliding bush (18)
from the slider.
17
WARNING
Wash the components in clean, fire-proof solvent.
ch. 7
18
Release 00
2001-03
7-49
Body work
RS 50
CHECKING THE COMPONENTS
TUBE
Check for scoring and/or scratches on the slide
surface. Very slight scoring can be removed with
emery cloth or 600 wet or dry paper, wetted with fireproof solvent. Move the paper up and down the tube,
do not place the tube in a lathe to polish it.
WARNING
NEVER straighten and re-use a bent tube, as the
structure will have been weakened, making the
motorcycle dangerous to use.
Failure to observe this warning can lead to a fork
failure, which will inevitably lead to a serious
crash with subsequent serious injury or even
death.
SLIDER
Check for signs of damage and/or cracks; if any are
found, replace the slider.
SPRING
Check the condition of the following components:
sliding bush (1);
cap (2);
plunger (3).
Replace the component with a new one if there are
any signs of excessive wear or damage.
2
1
3
7-50
Release 00
2001-03
ch. 7
Body work
RS 50
WARNING
5
6
Remove any impurities from the bushes, being
careful not to scratch the surfaces.
4
Replace the following parts with new ones:
oil seal (4);
dust seal (5);
the 2 O-rings on the tube plug (6).
REFITTING THE FORK
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
WARNING
When refitting, take great care and check that the
sliding surfaces are in perfect condition (i.e. no
signs of wear, scoring, etc.), replacing any components with new ones when necessary. Take great
care to ensure that no foreign material gets into
the parts.
Do not re-use old oil.
7
Always replace the seals with new ones.
The reassembly must be done very carefully.
Apply a film of fork oil to the seals and bushes before
fitting them (see LUBRICANT CHART).
3
Place the slider (1) between the vice jaws (made of a
soft material: aluminum), with the open end pointing
up.
Fit the sliding bush (2) into the slider (1).
Next, insert the cap (3).
2
1
ch. 7
Release 00
2001-03
7-51
Body work
RS 50
CAUTION
4
Use a plastic-headed mallet (4) for the following
operations.
Using a drift of suitable diameter (5), fit the new oil
seal into the slider (1), ensuring that it is fully
seated by tapping lightly several times with a
plastic hammer (4).
5
1
Press theretainer ring (6) into the slider until you feel it
click into its groove.
6
Fit a new seal washer (7) and screw in and tighten the
screw (8).
7
8
9
CAUTION
10
Do not allow the plunger to fall in the following
operations.
1
Insert the complete plunger into the tube (9) and put a
new dust seal (10) in position.
Insert the tube into the slider (1), pushing it right down
until you feel it click into place.
Tighten the screw (8).
NOTE The tube (9) must slide freely in the slider (1),
with no sticking.
7-52
Release 00
2001-03
ch. 7
Body work
RS 50
With the tube fully extended, fit the dust cover (10) on
to the slider (1) (see pervious figure).
Hold the fork (11) in a vertical position.
Pour fork oil (see LUBRICANT CHART) into the fork,
until it reaches the correct level.
Quantity of oil: 285 ± 2 cm3 (10 ± 0.7 US fl oz).
Oil level: 140 mm (5.5 in) (from edge of tube).
11
NOTE The fork (11) must be perfectly vertical when
measuring the oil level. The oil level must be perfectly
equal in both legs.
With the tube (9) still extended, insert the spring (12).
12
9
Place the fork (11) in the vice with the soft jaws (A),
tightening the vice only moderately.
7
13
NOTE Fit two new O-rings on the tube plug (13).
Press down the tube plug (13) and fit the circlip (14).
Gradually release the tube plug until you feel the
circlip (14) click into place in the groove in the tube
(9).
ch. 7
14
9
A
Release 00
2001-03
7-53
Body work
RS 50
STEERING
1
2
3
4
5
6
7
8
9
10
Key
1) Steering stem tube
2) Washer
3) Upper plate
4) Ball bearing
5) Ring nut
6) Retainer ring
7) Washer
8) Roller bearing
9) Washer
10) Lower plate with steering stem
7-54
Release 00
2001-03
ch. 7
Body work
RS 50
REMOVING THE STEERING
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (STEERING).
Position the motorcycle on the rear stand
on a lift
platform (POSITIONING THE MOTORCYCLE ON
THE REAR STAND ).
Remove the fairings (REMOVING THE SIDE FAIRINGS).
Remove the saddle cowl (REMOVING THE LOWER
FAIRING).
Remove the exhaust pipe (REMOVING THE EXHAUST PIPE).
Remove the front fairing (REMOVING THE FRONT
FAIRING).
Remove the front braking system (REMOVING THE
FRONT BRAKE CONTROL).
Loosen and withdraw the speedometer cable (1) to
allow the removal of the front fork.
1
CAUTION
Because of the weight of the front fork, the following operations require a second person. Agree
beforehand on the procedure. Proceed with great
care during the removal. Support the front fork to
stop it from falling accidentally.
NOTE Removal of the front fork is greatly facilitated
by the removal of the front wheel and fender (or
mudguard) (see REMOVING THE FRONT WHEEL,
REMOVING THE FRONT MUDGUARD). Then, the
two front fork tube assemblies, along with the fork
head, may be easily removed as a unit.
NOTE Place a stand of suitable height and strength
7
under the engine cradle, positioning it so the front
forks extend over the front end of the platform.
Strap the motorcycle to the platform to prevent it from
tipping over while the fork is removed.
Remove the front wheel along with the front wheel
(REMOVING THE FRONT WHEEL).
Remove the front mudguard, following the procedure
described in (ADJUSTING THE PLAY ON THE
BEARINGS).
ch. 7
Release 00
2001-03
7-55
Body work
RS 50
Loosen and remove the adjustor ring nut (1).
Remove the roller bearing (3) and the retainer ring (4)
from the steering stem (2).
Remove the ring seal (5) and washer (6).
Using a bearing puller, remove the bearing (7) from its
seat in the frame.
Clamp the lower plate and steering stem (2) in a vice
with soft jaws.
Using a bearing extractor, or a pair of pry bars, gently
pull the bearing (3) and retainer ring (4) from the
steering stem. Take great care not to damage the
stem. Pry only on the inner race of the bearing, never
on the roller cage.
1
5
6
7
CAUTION
When refitting the bearings, use a hollow drift of
the same diameter as the inner race, when you are
installing bearings on the steering stem, and the
outer race, when you are installing bearings in the
fork head. Never allow the drift to contact the
rollers or the cage. Make sure that both the bearing inner and outer races are drifted fully home.
Before installation, carefully wash all components
with clean, fire-proof solvent. Lubricate the bearing races before you install them.
3
4
2
CHECKING THE COMPONENTS
WARNING
Check the condition of all the components, especially the ones listed below.
BEARINGS AND GASKETS
See (CHECKING THE COMPONENTS).
7-56
Release 00
2001-03
ch. 7
Body work
RS 50
REFITTING THE STEERING
2
NOTE For reassembly, the motorcycle and front fork
must be positioned as for disassembly. Follow the
disassembly procedure in reverse.
1
Apply a thin film of grease along the whole of the stem
(1) and to the roller bearings (2).
Hand-tighten the ring nut (3) until it just makes contact, and then tighten another 1/4 turn.
3
Reduce the play of the bearings (see ADJUSTING
THE PLAY ON THE BEARINGS).
Turn the handlebars to check that the cables and
hoses are not fouled, twisted, tangled or stretched
when the handlebars are rotated from lock to lock.
7
ch. 7
Release 00
2001-03
7-57
Body work
RS 50
REAR WHEEL
1
2
3
4
5
6
7
8
10
9
8
11
12
13
14
Key
1) Nut
2) Washer
3) Chain guide
4) Spacer
5) Caliper mounting plate
6) Spacer
7) Brake disc
8) Bearings
9) Spacer
10) Complete wheel
11) Shim
7-58
12) Rear sprocket
13) Chain guide
14) Washer
15) Axle
Release 00
2001-03
ch. 7
15
Body work
RS 50
REMOVING
THE COMPLETE REAR WHEEL
Read carefully (SERVICING SCHEDULE).
WARNING
Before proceeding, allow the engine and exhaust
to cool down to ambient temperature, to avoid
possible burns.
While disassembling and reassembling the wheel,
pay extra care not to damage the brake lines,
discs or pads.
NOTE The correct rear stand must be used for
removing the rear wheel .
DISASSEMBLY
Position the motorcycle on the appropriate rear
support stand, (POSITIONING THE MOTORCYCLE
ON THE REAR SUPPORT STAND ).
Rear stand: 8705021.
Prevent the axle (1) from rotating with the appropriate
Allen wrench.
Wheel nut (2) tightening torque:
59 Ft-lb (8 kgm) [80 Nm].
8
6
Remove the nut (2) and washer.
Place a support (3) under the tire, in such a way as to
keep the wheel in its position after loosening it.
Remove the axle (1) from the right side.
8
NOTE Observe the arrangement of the right (4) and left
(5) chain tensioners in order to be able to reassemble
them correctly. Remove the right (4) and left (5) chain
tensioners. Move the chain off the sprocket and lay it
down outside the sprocket.
NOTE Lower the drive chain (6) outside the crown gear (7).
1 5
7
7
9
WARNING
Take extra care to ensure that your fingers are not
caught between the chain and the rear sprocket.
Wear heavy work gloves when performing this
operation. If your fingers become entangled in the
chain and rear sprocket, you will amputate a finger
or suffer other serious injury.
2
4
Turn the wheel forward slightly, release the drive chain
(6) from the rear sprocket (7).
Remove the wheel from the swing arm from behind,
carefully removing the disc from the brake caliper.
NOTE Observe the arrangement of the spacers (8)
and (9) in order to be able to reassemble them correctly.
Remove the left spacers (8).
Remove the right spacers (9).
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CAUTION
Never touch the rear brake pedal after removing
the wheel. If you do, the caliper pistons may be
pushed out of their seats, and brake fluid will be
spilled.
Should you accidentally do this, take your motorcycle to your Local aprilia Delear who will know
how to repair this damage.
DISASSEMBLING THE REAR WHEEL
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the wheel (REMOVING THE COMPLETE
REAR WHEEL).
Follow the procedure described in the (DISASSEMBLING THE FRONT WHEEL) chapter.
In addition, disassemble the crown gear (CROWN
GEAR).
CHECKING THE COMPONENTS
See the (CHECKING THE COMPONENTS) chapter.
CROWN GEAR
1
Check the state of the teeth on the rear sprocket (1)
and front sprocket.
If there are signs of excessive wear, replace the rear
sprocket, front sprocket and chain (REMOVING THE
DRIVE CHAIN).
CAUTION
All three parts must be replaced together, to avoid
the premature wear of the new components.
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REASSEMBLY REAR WHEEL
1
Read carefully (SERVICING SCHEDULE).
Apply a thin film of grease to the outer seals of the
rear wheel hub.
7
CAUTION
The spacers have different diameters: do not mix
them up and take care to position them correctly.
Insert the left (1) and right (2) spaces in their seals on
the wheel hub.
Install the spacer (4) in its correct position, if it has
fallen out of the torque plate seat (3).
1
CAUTION
11
8
10
3
Before proceeding with the reassembly, make sure
that the torque plate (3) of the brake caliper (4) is
positioned correctly; the plate slot must be inserted in the appropriate stop pin (5) in the inner
part of the right side of the swinging arm.
Insert the disc in the brake caliper carefully.
2
9
4
Position the wheel centrally in the swinging arm (6).
12
WARNING
7
Take extra care to ensure that your fingers are not
caught between the chain and the rear sprocket.
Wear heavy work gloves when performing this
operation. If your fingers become entangled in the
chain and rear sprocket, you will amputate a
finger or suffer other serious injury.
Move the wheel forward as far as possible in order to
install the chain (7) on the sprocket (8).
Pull the rear wheel backwards until the bearing holes
are lined up with the holes in the swinging arm.
Rotate the torque plate (3), complete with brake caliper
(4), with the stop pin (5) in proper position until it is
appropriately aligned with the holes in the swing arm.
6
Install the right (9) and left (10) chain tighteners in
their seats on the swing arm.
Lightly grease the outside of the axle (11).
Install the axle (11) completely through the wheel from
the left side.
NOTE Ensure that the axle (1) is pushed all the way
home with the head in the appropriate seat on the left
chain tightener (10).
Install the washer and tighten the nut (12) finger tight.
Check the chain tension, (DRIVE CHAIN).
5
10
4
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Tighten the nut (1).
Wheel nut (1) tightening torque:
59 Ft-lb (8 kgm) [80 Nm].
WARNING
After servicing the brakes, always check them for
function. If the stroke of the lever or pedal is
excessive, or if you detect that the effectiveness
of the brakes is reduced in any way, have your
motorcycle serviced by your Local aprilia Delear.
It may be necessary to have your dealer bleed the
system, or there may be some other problem with
the brake system.
Never ride your motorcycle in traffic immediately
after servicing the brakes.
Always apply the brake pedal or lever several
times before riding your motorcycle. Then, try
your motorcycle in a parking lot or other safe area
with little traffic to ensure that the brakes are
working properly. Failure to observe this warning
can lead to a serious accident with subsequent
serious injury or death.
Check the wheel centering.
Have the tightening torques, centering and balancing of the wheel checked by your Local aprilia
Delear. These are critical safety operations, and
failure to observe this warning could lead to an
upset with subsequent serious injury or death.
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REAR BRAKE
6
1
3
5
2
7
4
7
10
8
9
Key
1) Brake fluid reservoir
2) Reservoir-to-master cylinder brake fluid tube
3) Brake light switch
4) Brake master cylinder
5) Master cylinder-to-caliper brake fluid tube
6) Brake pedal
7) Brake disc
8) Bleed valve
9) Brake caliper
10) Brake pad
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CHANGING
THE REAR BRAKE PADS
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION) and (CHECKING THE WEAR ON
THE BRAKE PADS).
Position the motorcycle on the stand.
Remove the brake caliper cover (1).
1
NOTE Before withdrawing the pin (3), check the
position of the safety spring (4); it must be positioned
in the same way when refitted, with the arrow
stamped on its back pointing down.
Remove the retainer ring (2).
Withdraw the pin (3) and take off the safety spring (4).
Take out the 2 pads (5).
5
4
2
3
NOTE Do not pull on the brake lever after removing
the pads, as this could push caliper pistons out of their
housings and make the brake fluid leak out.
Insert 2 new pads, positioning them so that are
aligned with the holes in the caliper.
NOTE Always replace both pads and make sure they
are positioned correctly inside the caliper.
Position the safety spring (4).
Keeping the safety spring (4) pressed down in the
center, insert the pin (3) so that it goes above the
spring.
Position theretainer ring (2).
Position the brake caliper cover (1).
Check the brake fluid level (CHECKING AND TOPPING UP THE BRAKE FLUID).
4
2
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REMOVING THE REAR BRAKE DISC
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rear wheel (REMOVING THE COMPLETE REAR WHEEL).
NOTE It is helpful to use an impact wrench to loosen
the bolts (1), since they are locked in place using
LOCTITE®.
Unscrew and remove the 5 brake disc bolts (1).
2
1
WARNING
When refitting, apply LOCTITE® to the brake disc
bolt threads.
A
NOTE When refitting, hand-tighten the bolts and
2
D
then torque them in diagonal order, i.e.: A-B-C-D-E.
C
Remove the brake disc (2).
B
E
CHECKING THE BRAKE DISC
7
NOTE Checking the brake disc for warpage must be
done with the brake discs installed on the wheel.
Using a dial gauge, check the maximum misalignment
of the brake disc. If it exceeds the limits, it must be
renewed (see REMOVING THE BRAKE DISC).
Check the wear of the disc by measuring the minimum
thickness at various points around the disc with a
micrometer. If the disc is less than the specified
minimum thickness at any point, renew the disc (see
REMOVING THE BRAKE DISC).
Minimum disc thickness: 3.5 mm (0.14 in).
REMOVING THE REAR BRAKE MASTER
CYLINDER
1
2
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Position the motorcycle on the stand.
Drain the brake fluid, as described in (CHANGING
THE REAR BRAKE FLUID).
When the reservoir is empty, unscrew and remove the
brake light switch (1), move the tube (2) and remove
the seal washers (3).
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Loosen and move the tube clamp (4).
Withdraw the tube (5) and remove the 2 screws (6).
5
Torque setting for screws (6):
10 Nm (1.0 kgm) [7.4 Ft-lb].
4
Remove the master cylinder (7), taking it out from the
front.
7
6
NOTE When refitting, refill with brake fluid (CHECKING AND TOPPING UP THE REAR BRAKE FLUID)
and bleed the air from the brake circuit (BLEEDING
THE BRAKE SYSTEMS).
REMOVING THE REAR SUSPENSION
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the rear mudguard (REMOVING THE REAR
MUDGUARD).
Remove the pillar cover (REMOVING THE PILLAR
COVER).
NOTE Position a support between the rear wheel
and the lower part of the frame.
Loosen and remove the nut (1) and push out the
screw (2) partially.
Torque setting for nut (1):
48 Nm (4.8 kgm) [35.4 Ft-lb].
Remove the screw (2) and pull the rear suspension
out from the front; remove the washer.
Remove the support from between the rear wheel and
the lower part of the frame, so that the wheel rests on
the frame.
3
4
1
2
Loosen and remove the nut (3) and push out the
screw (2) partially.
Torque setting for screw (2):
48 Nm (4.8 kgm) [35.4 Ft-lb].
Remove the screw (2) and take off the washer.
Grasp the suspension (4) and remove it from under
the motorcycle.
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Remove the 4 T-bushes (5) and withdraw the 2 silentblocks (6).
NOTE Wash all components with fire-proof solvent.
5
6
Check the components (CHECKING THE SUSPENSION COMPONENTS).
5
CHECKING
THE SUSPENSION COMPONENTS
WARNING
Ensure that none of the components show any
signs of bending, cracking, or denting. Replace
any damaged components.
GASKETS
7
Check the condition of the gaskets; replace them if
there are any signs of damage or excessive wear.
SHOCK ABSORBER
Check that the spring is not distorted and that the
movement of the shock absorber is smooth and
gradual.
Ensure that no oil is leaking.
Replace the shock absorber if it shows any trace of
leakage or if the shaft is in any way damaged.
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REMOVING THE DRIVE CHAIN
Read carefully (SERVICE SCHEDULE) and (PRECAUTIONS AND GENERAL INFORMATION).
Position the motorcycle on the rear stand
(POSITIONING THE MOTORCYCLE ON THE REAR STAND).
Rear stand: 8705021.
WARNING
Take extra care to ensure that your fingers are not
caught between the chain and the rear sprocket.
Wear heavy work gloves when performing this
operation. If your fingers become entangled in the
chain and rear sprocket, you will amputate a finger
or suffer other serious injury.
Using a small blade screwdriver, or a pair of needlenose pliers, remove the master link clip (1).
Remove the plate (2a) and the master link (2b).
Pull the chain (3) rearward of the front sprocket.
WARNING
When refitting the chain (3), make sure that the
master link clip (1) is fitted with the open end
facing opposite the direction of travel. Failure to
adhere to this instruction can lead to the spontaneous loss of the master link and chain. This can
cause seizure of the rear wheel, which can lead to
loss of control and upset, with subsequent serious
injury or even death. Also, if the master link comes
out, the chain can flail around and injure you.
2b
2a
1
3
WARNING
An excessively loose chain can come off the
sprocket, which can also result in rear wheel jamming, as well as serious damage to the motorcycle.
Never ride your motorcycle with an improperly
adjusted chain (CHAIN ADJUSTMENT).
CAUTION
Lack of maintenance can cause premature wear of
the chain and damage to the sprockets.
Clean and lubricate your chain more often if your
motorcycle is used on dusty or muddy roads.
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REMOVING THE SWING ARM
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the side fairings (REMOVING THE SIDE
FAIRINGS).
Remove the saddle cowl (REMOVING THE LOWER
FAIRING).
Remove the exhaust pipe, (REMOVING THE EXHAUST PIPE AND MUFFLER).
CAUTION
Place a stand of suitable height and strength
under the engine cradle, so that the motorcycle
stays stable during the disassembly and reassembly work.
Proceed with great care when removing the swing
arm.
Remove the chain (REMOVING THE DRIVE CHAIN).
Remove the rear wheel (REMOVING THE COMPLETE REAR WHEEL).
Withdraw the caliper mounting plate (1), complete with
the rear brake caliper (2), with the tubes still connected up.
7
CAUTION
Danger of brake fluid spilling out. Do not work the
rear brake lever when the fluid reservoir cap is
loosened or removed.
1
2
Loosen and remove the nut (3) and push out the
screw (4) partially.
Torque setting for nut (3):
48 Nm (4.8 kgm) [35.4 Ft-lb].
5
Remove the screw (4) and take the rear suspension
(5) out from the front.
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NOTE Use the special tool
(swing arm pin adjust-
ment socket wrench).
Using the special socket wrench
remove the locking ring nut (7).
(6), loosen and
Swing arm pin adjustment socket wrench: 8101945
7
6
WARNING
Because of the weight of the rear part, the following operations require a second person.
Agree before hand on the procedure.
Proceed with great care when removing the swing
arm.
Support the front of the swing arm to stop it
falling accidentally.
Remove the rear wheel (see REMOVING THE REAR
WHEEL).
Working from the right side of the motorcycle, turn the
adjustment bush (8) clockwise until it is fully loosened.
8
Support the front of the swinging arm while removing
the swinging arm pivot bolt (9) from the left.
Remove the complete swinging arm from the rear, and
remove the two washers from the pivot (9).
Using a drift of suitable diameter, tap the bush (8)
from the left side of the motorcycle.
If necessary, remove the chain guide (REMOVING
THE CHAIN GUIDE).
9
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DISASSEMBLING THE SWING ARM
1
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Remove the bushes (1).
Remove the O-rings (2).
2
4
3
WARNING
1
When reassembling, use 2 new O-rings (2).
Remove the internal spacer (3).
4
2
Using a drift of suitable diameter, remove the internal
bushes (4).
NOTE Wash all components with clean detergent.
WARNING
When refitting the internal bushes (4), use a jig of
suitable diameter.
CHECKING THE COMPONENTS
7
WARNING
Ensure that none of the components show any
signs of bending, cracking, or denting. Replace
any damaged components.
GASKETS
Check the condition of the gaskets; replace them if
they show any signs of damage or excess wear.
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REASSEMBLING THE SWING ARM
5
Read carefully (PRECAUTIONS AND GENERAL
INFORMATION).
Install the internal spacer (3).
Using an appropriate shoulder drift, install the internal
bushings (2), fit to the O-ring seals (4) fit the two outer
bushings (6) in the left side of the swinging arm,
ensuring that it is driven fully home.
4
2
3
5
2
Install the two washers (7) into the swinging arm pivot
(1).
Apply a thin film of grease along the whole length of
the pivot.
4
7
1
Move the swinging arm into position so that the pivots
pass through the holes in the frame and the holes in
the swing arm.
Insert the adjustment bush (8), pressing it fully home
against the swingarm.
Insert the swingarm pivot (1).
8
NOTE Use the special tool (9)
(swing arm pin
adjustment socket wrench).
10
Swing arm pin adjustment socket wrench: 8101945.
Insert the adjustment ring nut (10) and tighten manually with the tool (9).
NOTE The flat side of the adjustment ring nut (10)
must be against the frame.
9
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Fully tighten the pin (1).
Torque setting for pin (1):
70 Nm (7 kgm) [5.2 Ft-lb].
NOTE From this point, proceed with the refitting of
the swing arm by going through the removal procedure in reverse order, starting from REMOVING THE
SWING ARM.
1
7
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NOTES
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ch. 7
Workshop manual
Fornacette (PI) - ITALY
RS 50
Via G. Galilei, 1
30033 Noale (VE)
Tel. +39 (0) 41 - 5829111
Fax +39 (0) 41 - 441054
www.aprilia.com
www.serviceaprilia.com
Italy
8140250
Produced by
aprilia s.p.a.
979 X