aprilia_sonic_brugermanual B 2922 KB

aprilia_sonic_brugermanual B 2922 KB
© 2002 aprilia s.p.a. - Noale (VE)
SAFETY WARNINGS
The following precautionary warnings are
used throughout this manual in order to
convey the following messages:
warning. When you find this
Safety
symbol on the vehicle or in the
manual, be careful to the potential risk
of personal injury. Non-compliance
with the indications given in the messages preceded by this symbol may result in grave risks for your and other
people»s safety and for the vehicle!
First edition: december 2002

Reprint:
tion.
Produced and printed by:
editing division
Soave (VERONA) - Italy
Tel. +39 - 045 76 11 911
Fax +39 - 045 76 12 241
E-mail: [email protected]
www.stp.it
On behalf of:
aprilia s.p.a.
via G. Galilei, 1 - 30033 Noale (VE) - Italy
Tel. +39 - 041 58 29 111
Fax +39 - 041 44 10 54
www.aprilia.com
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use and maintenance Sonic 50
Indications to make the operations easier. Technical informa-
TECHNICAL INFORMATION
★
The operations preceded by this
symbol must be repeated also on
the opposite side of the vehicle.
If not expressly indicated otherwise, for the
reassembly of the units repeat the disassembly operations in reverse order.
The terms ≈right∆ and ≈left∆ are referred to
the rider seated on the vehicle in the normal riding position.
WARNINGS - PRECAUTIONS GENERAL ADVICE
Before starting the engine, carefully read
this manual and in particular the section
≈SAFE DRIVE∆.
Your and other people»s safety depends
not only on your quickness of reflexes and
on your agility, but also on what you know
about the vehicle, on its efficiency and on
your knowledge of the basic information for
≈SAFE DRIVE∆.
Therefore, get a thorough knowledge of the
vehicle, in such a way as to be able to drive
in the traffic safely.

This manual must be considered
as an integral part of the vehicle
and must always accompany it,
even in case of resale.
aprilia has carried out this manual with the
maximum attention, in order to supply the
user with correct and updated information.
However, since aprilia constantly improves the design of its products, there
may be slight discrepancies between the
characteristics of your vehicle and those
described in this manual.
For any clarification concerning the information contained in this manual, do not
hesitate to contact your aprilia Official
Dealer.
For control and repair operations not expressly described in this publication, for the
purchase of aprilia genuine spare parts,
accessories and other products, as well as
for specific advice, contact exclusively
aprilia Official Dealers and Service Centers, which guarantee prompt and accurate
assistance.
Thank you for choosing aprilia. We wish
you a nice ride.
All rights as to electronic storage, reproduction and total or partial adaptation, with
any means, are reserved for all Countries.

In some countries the antipollution
and noise regulations in force require periodical inspections.
The user of the vehicle in these countries
must:
√ contact an aprilia Official Dealer to have
the non-homologated components replaced with others homologated for use
in the country in question;
√ carry out the required periodical inspections.
Soon after purchasing the vehicle,
write down the identification data
indicated on the SPARE PARTS
IDENTIFICATION LABEL in the table here below. The label is positioned on
the right beam of the frame; to read it, remove the inspection cover, see p. 52 (REMOVING THE INSPECTION COVER).

These data indicate:
√ YEAR = year of manufacture (Y, 1, 2, ...);
√ I.M. = modification code (A, B, C, ...);
√ COUNTRY CODES = homologation
country (I, UK, A, ...).
and are to be supplied to the aprilia Official Dealer as reference data for the purchase of spare parts or specific accessories of the model you have acquired.
In this manual the various versions are indicated by the following symbols:
 optional
 liquid-cooled version
VERSION:
 Italy
 Singapore
 United Kingdom  Slovenia
 Austria
 Israel
 Portugal
 South Korea
 Finland
 Malaysia

 Chile
Belgium
 Germany
 Croatia
 France
 Australia
 Spain
 United States
 Greece
 Brazil
 Holland
 South Africa
 Switzerland
 New Zealand
 Denmark
 Canada
of America
 Japan
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TABLE OF CONTENTS
SAFE DRIVE ...............................................................5
BASIC SAFETY RULES ......................................6
CLOTHING ..........................................................9
ACCESSORIES .................................................10
LOAD .................................................................10
STOPPING ........................................................33
PARKING ...........................................................33
POSITIONING THE VEHICLE
ON THE STAND ................................................34
SUGGESTIONS TO PREVENT THEFT ............34
ARRANGEMENT OF THE MAIN ELEMENTS ........12
MAINTENANCE .......................................................35
REGULAR SERVICE INTERVALS CHART ......36
IDENTIFICATION DATA ....................................38
AIR CLEANER ...................................................38
CHECKING
THE TRANSMISSION OIL LEVEL ....................40
CHANGING
THE TRANSMISSION OIL ................................41
FRONT WHEEL .................................................42
REAR WHEEL ...................................................44
CHECKING
THE BRAKE PAD WEAR ..................................45
CHECKING
THE SHOE WEAR .............................................46
GREASING
THE REAR BRAKE CAM PIN ...........................46
CHECKING THE STEERING ............................48
CHECKING
THE ENGINE FULCRUM AXIS .........................48
REMOVING
THE EXHAUST SILENCER ...............................49
REMOVING
THE FRONT HANDLEBAR COVER .................50
REMOVING
THE REAR HANDLEBAR COVER ....................50
REMOVING
THE FRONT TRANSPARENT SCREEN ...........51
REMOVING
THE REAR-VIEW MIRROR ...............................51
REMOVING
THE INSPECTION COVER ...............................52
REMOVING THE FRONT COVER
OF THE REAR PART OF THE FAIRING ..........52
IDLING ADJUSTMENT ......................................53
ADJUSTING
THE ACCELERATOR CONTROL .....................53
ARRANGEMENT OF THE INSTRUMENTS ............14
INSTRUMENTS AND INDICATORS ........................14
INSTRUMENT AND INDICATOR TABLE .........15
MAIN INDEPENDENT CONTROLS .........................16
CONTROLS ON THE LEFT SIDE
OF THE HANDLEBAR ......................................16
CONTROLS ON THE RIGHT SIDE
OF THE HANDLEBAR ......................................17
IGNITION SWITCH ...........................................18
STEERING LOCK .............................................18
AUXILIARY EQUIPMENT ........................................19
UNLOCKING/LOCKING THE SADDLE ............19
CRASH HELMET / GLOVE COMPARTMENT ..19
ANTI-THEFT HOOK ..........................................19
TOOL KIT ..........................................................20
BAG HOOK .......................................................20
GLOVE COMPARTMENT .................................20
MAIN COMPONENTS ..............................................21
FUEL .................................................................21
2 STROKE OIL TANK .......................................22
BRAKE FLUID - recommendations ...................22
FRONT BRAKE DISC .......................................23
REAR DRUM BRAKE ........................................24
TYRES ...............................................................25
COOLANT
..................................................26
AUTOMATIC
LIGHT SWITCHING VERSION .........................28
CATALYTIC SILENCER ....................................28

INSTRUCTIONS FOR USE ......................................29
PRELIMINARY CHECKING OPERATIONS ......29
STARTING ........................................................30
DEPARTURE AND DRIVE ................................32
RUNNING-IN .....................................................33
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SPARK PLUG ................................................... 54
BATTERY ......................................................... 55
LONG INACTIVITY OF THE BATTERY ........... 55
CHECKING AND CLEANING
THE TERMINALS ............................................. 56
REMOVING THE BATTERY ............................ 56
CHECKING
THE ELECTROLYTE LEVEL ........................... 57
RECHARGING THE BATTERY ........................ 57
INSTALLING THE BATTERY ........................... 57
CHANGING THE FUSE .................................... 58
ADJUSTING
THE VERTICAL HEADLIGHT BEAM ............... 59
BULBS .............................................................. 59
CHANGING THE HEADLIGHT BULBS ............ 60
CHANGING THE FRONT
DIRECTION INDICATOR BULBS .................... 61
CHANGING THE DASHBOARD BULBS .......... 62
CHANGING THE REAR LIGHT BULB ............. 63
CHANGING THE NUMBER PLATE BULB ........ 63
TRANSPORT ........................................................... 64
DRAINING THE FUEL TANK ........................... 64
CLEANING .............................................................. 65
LONG PERIODS OF INACTIVITY .................... 66
AFTER A PERIOD OF INACTIVITY ................. 66
TECHNICAL DATA ................................................. 67
LUBRICANT CHART ........................................ 71
Importers ...................................................... 74-75
WIRING DIAGRAM Sonic 50 ............................ 76
WIRING DIAGRAM KEY Sonic 50 ................... 77
safe drive
BASIC SAFETY RULES
To drive the vehicle it is necessary to be in
possession of all the requirements prescribed by law (driving licence, minimum
age, psychophysical ability, insurance,
state taxes, vehicle registration, number
plate, etc.).
Gradually get to know the vehicle by driving it first in areas with low traffic and/or private areas.
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use and maintenance Sonic 50
The use of medicins, alcohol and drugs or
psychotropic substances notably increases
the risk of accidents.
Be sure that you are in good psychophysical conditions and fit for driving and pay
particular attention to physical weariness
and drowsiness.
Most road accidents are caused by the
driver»s lack of experience.
NEVER lend the vehicle to beginners and,
in any case, make sure that the driver has
all the requirements for driving.
Rigorously observe all road signs and national and local road regulations.
Avoid abrupt movements that can be dangerous for yourself and other people (for
example: rearing up on the back wheel,
speeding, etc.), and give due consideration
to the road surface, visibility and other driving conditions.
Avoid obstacles that could damage the vehicle or make you lose control.
Avoid riding in the slipstream created by
preceding vehicles in order to increase
your speed.
Always drive with both hands on the handlebars and both feet on the footrests, in
the correct driving posture.
Avoid standing up or stretching your limbs
while driving.
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7
OIL
The driver should pay attention and avoid
distractions caused by people, things and
movements (never smoke, eat, drink, read,
etc.) while driving.
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COOLER
Use only the vehicle»s specific fuels and lubricants (indicated in the ≈LUBRICANT
CHART∆); check all oil, fuel and coolant
levels regularly.
If the vehicle has been involved in an accident, make sure that no damage has occurred to the control levers, pipes, wires,
braking system and vital parts.
If necessary, have the vehicle inspected by
an aprilia Official Dealer, who should carefully check the frame, handlebars, suspensions, safety parts and all the devices that
you cannot check by yourself.
Always remember to report any malfunction to the technicians to help them in their
work.
Never use the vehicle when the amount of
damage it has suffered endangers your
safety.
ONLY ORIGINALS
A12
345
Never change the position, inclination or
colour of: number plate, direction indicators, lights and horns.
Any modification of the vehicle will result in
the invalidity of the guarantee.
Any modification of the engine or of other
members which is aimed at increasing the
speed or the power of the vehicle is prohibited by the law; in fact, any modification resulting in an increase of the maximum
speed or of the engine displacement would
change the scooter into a motorcycle,
which implies the following obligations for
the owner:
√ new homologation;
√ new registration;
√ appropriate driving license.
Further, said modifications cause the loss
of the insurance cover, since insurance
policies expressly prohibit to make technical changes aimed at increasing the vehicle performance levels.
For the reasons stated above, the failure to
comply with the tampering prohibition is
punished by law with apposite sanctions
(including the confiscation of the vehicle),
which, according to the case, can be combined with the sanctions provided for not
using the crash helmet and/or the number
plate, for the violation of fiscal obligations
(ownership tax) and with penal sanctions
provided for using the vehicle without driving license.
Never race with other vehicles.
Avoid off-road driving.
CLOTHING
Before starting, always wear a correctly
fastened crash helmet. Make sure that it is
homologated, in good shape, of the right
size and that the visor is clean.
Wear protective clothing, preferably in light
and/or reflecting colours. In this way you
will make yourself more visible to the other
drivers, thus notably reducing the risk of
being knocked down, and you will be more
protected in case of fall. This clothing
should be very tight-fitting and fastened at
the wrists and ankles. Strings, belts and
ties should not be hanging loose; prevent
these and other objects from interfering
with driving by getting entangled with moving parts or driving mechanisms.
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9
Do not keep objects that can be dangerous
in case of fall, for example pointed objects
like keys, pens, glass vials etc. in your
pockets (the same recommendations also
apply to passengers).
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ACCESSORIES
The owner of the vehicle is responsible for
the choice, installation and use of any accessory.
Avoid installing accessories that cover
horns or lights or that could impair their
functions, limit the suspension stroke and
the steering angle, hamper the operation of
the controls and reduce the distance from
the ground and the angle of inclination in
turns. Avoid using accessories that hamper
access to the controls, since this can prolong reaction times during an emergency.
Large fairings and windscreens assembled
on the vehicle can produce aerodynamic
forces capable of compromising the stability of the vehicle while driving. Make sure
that the equipment is well fastened to the
vehicle and not dangerous during driving.
Do not install electrical devices and do not
modify those already existing to avoid electrical overloads, because the vehicle could
suddenly stop or there could be a dangerous current shortage in the horn and in the
lights. aprilia recommends the use of
≈aprilia genuine accessories∆.
LOAD
Be careful and moderate when loading
your luggage. Keep any luggage loaded as
close as possible to the centre of the vehicle and distribute the load uniformly on
both sides, in order to reduce imbalance to
the minimum. Furthermore, make sure that
the load is firmly secured to the vehicle, especially during long trips.
KG!
Avoid hanging bulky, heavy and/or dangerous objects on the handlebars, mudguards
and forks, because the vehicle might respond more slowly in turns and its manoeuvrability could be unavoidably impaired.
Do not place bags that are too bulky on the
vehicle sides, because it could hit people
or obstacles making you lose control of the
vehicle.
Do not carry any bag if it is not tightly secured to the vehicle.
Do not carry bags which protrude too much
from the luggage-rack or which cover the
lights, horn or indicators.
Do not carry animals or children on the
glove compartment or on the luggage-rack.
Do not exceed the maximum load allowed
for each side-bag.
When the vehicle is overloaded, its stability
and its manoeuvrability can be compromised.
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ARRANGEMENT OF THE MAIN ELEMENTS
KEY
1)
2)
3)
4)
5)
6)
12
Bag hook
Fuel tank
Fuel tank plug
Saddle lock
Transmission oil filling cap
Kick starter
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7)
8)
9)
10)
11)
Transmission oil drain plug
Centre stand
Air cleaner
Side stand 
Horn
KEY
1) 2 stroke oil tank plug
2) 2 stroke oil tank
3) Glove compartment
4) Ignition switch/steering lock
5) Brake fluid reservoir (front brake)
6) Coolant expansion tank plug 
7) Expansion tank 
8)
9)
10)
11)
12)
Front cover of the rear part of the fairing
Inspection cover
Battery
Fuse carrier
Anti-theft hook (for the aprilia ≈BodyGuard∆ armored cable ).
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ARRANGEMENT OF THE INSTRUMENTS
KEY
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
14
INSTRUMENTS AND INDICATORS
KEY
Direction indicator switch ()
Horn push button ()
Cold start lever ()
Rear brake lever
Left rear-view mirror (not provided in the  version)
Instruments and indicators
Right rear-view mirror (in the countries where required)
Front brake lever
Throttle grip
Start push button ()
Ignition switch/steering lock ( -  - )
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1)
2)
3)
4)
5)
6)
7)
8)
Fuel level indicator ()
Speedometer
Total kilometres odometer
Coolant temperature indicator () 
Green direction indicator warning light ()
Red 2 stroke oil reserve warning light ()
Green low beam warning light ()
Amber low fuel warning light ()
INSTRUMENT AND INDICATOR TABLE
Description
Direction indicator warning light
Function
()
It blinks when the direction indicators are on.
It comes on when the ignition switch is in position ≈∆ and the start push button
≈≈ is pressed, thus checking the proper functioning of the bulb.
If the light does not come on during the starting, provide for replacing the bulb.
2 stroke oil reserve warning light
()

If the warning light comes on and does not go out after the start
push button ≈∆ has been released, or if it comes on during normal functioning, this means that the 2 stroke oil reserve is being
used; in this case, top up the 2 stroke oil tank, see p. 22 (2 STROKE OIL
TANK).
Total kilometres odometer
It indicates the total number of kilometres covered.
Speedometer
It indicates the driving speed.
Low beam warning light
()
It comes on whenever the ignition switch is turned to position “”.
Low fuel warning light
()
It comes on when the quantity of fuel left in the tank is about 1,5 b.
Fuel level indicator
()
It indicates the approximate fuel level in the tank.
Coolant temperature indicator 
( )
It indicates the approximate temperature of the coolant in the engine.
When the pointer starts moving beyond the ≈min∆ level, the temperature is sufficient for driving the vehicle.
The normal running temperature range is indicated by the central area of the
scale.
If the pointer reaches the red area, stop the engine and check the coolant level,
see p. 26 (COOLANT ).

If the maximum allowed temperature is exceeded (red area ≈max∆
of the scale), the engine may be seriously damaged.
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MAIN INDEPENDENT CONTROLS
CONTROLS ON THE LEFT SIDE OF THE HANDLEBAR


The electrical parts work only when the ignition
switch is in position ≈∆.
The lighting system works only when the engine is
running.
1) HORN PUSH BUTTON ()
The horn is activated when the push button is pressed.
2) COLD START LEVER ()
The starter for the cold start of the engine is operated by rotating the lever downwards.
To disconnect the cold start, bring the lever to its initial position.
3) DIRECTION INDICATOR SWITCH ()
To indicate the turn to the left, move the switch to the left; to
indicate the turn to the right, move the switch to the right.
To turn off the direction indicator, press the switch.
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CONTROLS ON THE RIGHT SIDE
OF THE HANDLEBAR


The electrical parts work only when the ignition
switch is in position ≈∆.
The lighting system works only when the engine is
running.
1) START PUSH BUTTON ()
When the start push button is pressed and one of the brake
levers (front or rear) is activated at the same time, the starter
makes the engine run.
For the starting procedure, see p. 30 (STARTING).
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Position
It is possible
to remove
the key.

Neither the
engine, nor
the lights can
be switched
on.
It is possible
to remove
the key.

The engine
and the lights
can be
switched on.
It is not possible to remove the
key.
Steering
lock
STEERING LOCK
The ignition switch is positioned on the
right side, near the steering column.
Never turn the key to position ≈  ∆ in
running conditions, in order to avoid
losing control of the vehicle.

The key (1) operates the ignition
switch/steering lock, glove compartment and the saddle lock.
Two keys are supplied together with the
vehicle (one spare key).
OPERATION
To lock the steering:
◆ Turn the handlebar completely leftwards.
◆ Turn the key (1) to position ≈∆ and
press it.
◆ Release the key.

Turn the key and steer the handlebar at the same time.
◆
Rotate the key (1) anticlockwise (leftwards), steer the handlebar slowly until
the key (1) reaches position ≈∆.
◆ Extract the key.
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Key
removal
The steering
is locked.
It is neither
possible to
start the engine, nor to
switch on the
lights.

IGNITION SWITCH
Function
AUXILIARY EQUIPMENT
UNLOCKING/LOCKING
THE SADDLE
CRASH HELMET / GLOVE
COMPARTMENT
To unlock and lift the saddle:
◆ Insert the key in the saddle lock (1).
◆ Turn the key clockwise and raise the
saddle (2).
Thanks to the crash helmet/glove compartment, you no longer have to carry the
crash helmet or other objects with you every time you park the vehicle.
The compartment is positioned under the
saddle.
To reach it:
◆ Raise the saddle, see beside (UNLOCKING/LOCKING THE SADDLE).

Before lowering and locking the
saddle, make sure that you have
not left the key in the crash helmet/glove compartment.
◆
To lock the saddle, lower and press it
(without exerting too much pressure),
thus making the lock snap shut.

Before leaving, make sure that
the saddle is properly locked.


Position the helmet with the
opening facing upwards, as
shown in the figure.
ANTI-THEFT HOOK
The anti-theft hook (3) is positioned on the
rear side of the vehicle, near the rear light.
To prevent the vehicle from being stolen, it
is advisable to secure it with the aprilia
≈Body-Guard∆ armored cable  (4), available at any aprilia Official Dealer.

Do not use the hook to lift the vehicle or for any purpose other
than securing the vehicle once it
has been parked.
Do not load the crash helmet/glove compartment too
much.
Maximum allowed weight: 2.5 kg.
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19
TOOL KIT
The tool kit is hooked to the underside of
the saddle.
To reach it, proceed as follows:
◆ Lift the saddle (1), see p. 19 (UNLOCKING/LOCKING THE SADDLE).
◆ Release the rubber band (2) from the
hook.
◆ Take the tool kit (3).
The tool kit (3) includes:
√ n. 1 tool case
√ n. 1 21 mm spark plug socket spanner
√ n. 1 socket spanner rod
√ n. 1 8/10 mm socket spanner
√ n. 1 double-ended, cross-/cut headedscrewdriver type PH size 2
√ n. 1 screwdriver handle
√ n. 1 3 mm hexagon spanner
√ n. 1 4 mm hexagon spanner
Maximum allowed weight: 1.5 kg.
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BAG HOOK
GLOVE COMPARTMENT

It is placed under the handlebar, on the inner part of the shield.
To reach it:
◆ Introduce the ignition key (5) in the lock.
◆ Turn the key clockwise, pull it and open
the door (6).
Do not hang excessively bulky
bags or parcels to the hook, as
this may seriously compromise
the manoeuvrability of the vehicle or the
movement of your feet.
The bag hook (4) is positioned on the front
part of the inner shield.
Max. allowed weight: 1.5 kg.

Before locking the door, make
sure that you have not left the
key in the glove compartment.
To lock the door (6), raise and press it. It is
not necessary to use the key.
Maximum allowed weight: 1.5 kg.
MAIN COMPONENTS
Further, prevent fuel from flowing out of
the fuel filler, as it could catch fire when
getting in contact with the red-hot surfaces of the engine.
In case some fuel has accidentally been
spilt, make sure that the area has completely dried and before starting the vehicle verify that there is no fuel inside
the fuel filler neck.
FUEL

The fuel used for internal combustion engines is extremely inflammable and in particular conditions it can become explosive.
It is important to carry out the refuelling
and the maintenance operations in a
well-ventilated area, with the engine off.
Do not smoke while refuelling or near
fuel vapours, in any case avoid any contact with naked flames, sparks and any
other heat source to prevent the fuel
from catching fire or from exploding.
Since petrol expands under the heat of
the sun and due to the effects of sun radiation, never fill the tank to the brim.
Screw the plug (1) up carefully after refuelling.
Avoid any contact of the fuel with the
skin and the inhalation of vapours; do
not swallow fuel or pour it from a receptacle into another by means of a tube.
KEEP AWAY FROM CHILDREN.
Use only unleaded petrol, in conformity
with the DIN 51607 standard, min. O.N. 95
(N.O.R.M.) and 85 (N.O.M.M.).
FUEL TANK CAPACITY
(reserve included): 8 b
TANK RESERVE: 1.5 b
To refuel, proceed as follows:
◆ Lift the saddle, see p. 19 (UNLOCKING/LOCKING THE SADDLE).
◆ Unscrew and remove the fuel tank plug
(1).
◆ Refuel.
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21
This operation is indispensable, since
the operation of the engine with air in
the mixer oil system may cause serious
damages to the engine itself.
To top up the 2 stroke oil tank, proceed as
follows:
◆ Lift the saddle, see p. 19 (UNLOCKING/LOCKING THE SADDLE).
◆ Remove the plug (1).
2 STROKE OIL TANK CAPACITY: 1.6 b
TANK RESERVE: 0.5 b
2 STROKE OIL TANK
Top up the 2 stroke oil tank every 500 km.
The vehicle is provided with a separate
mixer that makes it possible to mix petrol
with oil for the lubrication of the engine, see
p. 71 (LUBRICANT CHART).
The reserve is indicated by the coming on
of the 2 stroke oil reserve warning light
≈∆ positioned on the dashboard, see p.
14 and 15 (INSTRUMENTS AND INDICATORS).

The use of the vehicle without 2
stroke oil causes serious damages to the engine.
If you run out of oil in the 2 stroke oil
tank or if the mixer oil pipe has been removed, it is necessary to contact an
aprilia Official Dealer, who will provide
for bleeding the system.
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use and maintenance Sonic 50

Wash your hands carefully after
using the oil.
Do not dispose of the oil in the
environment.
KEEP AWAY FROM CHILDREN.
BRAKE FLUID - recommendations

Make sure that the brake disc and the
friction elements are neither oily nor
greasy, especially after maintenance or
checking operations.
Check that the brake cable is neither
twisted nor worn out.
Prevent water or dust from accidentally
getting into the circuit.
In case maintenance operations are to
be performed on the hydraulic circuit, it
is advisable to use latex gloves.
If the brake fluid gets in contact with the
skin or the eyes, it can cause serious irritations.
Carefully wash the parts of your body
that get in contact with the liquid.
Consult a doctor or an oculist if the liquid gets in contact with your eyes.
Sudden resistance or clearance
problems on the brake lever may
be due to problems in the hydraulic system.
Do not dispose of the brake fluid in the
environment.
For any doubt regarding the perfect
functioning of the braking system and
in case you are not able to carry out the
usual checking operations, contact
your aprilia Official Dealer.
When using the brake fluid, take
care not to spill it on the plastic
or painted parts, since it irreparably damages them.
KEEP AWAY FROM CHILDREN.

◆
◆
◆
Unscrew the two screws (3).
Remove the cover (4).
Remove the guide cover (5).

In order not to spill the brake fluid
while topping up, keep the fluid in
the reservoir parallel to the reservoir rim.
◆
Remove the gasket (6).

In order to reach the ≈MAX∆ level,
top up until covering the glass
(2) completely, with the brake fluid reservoir rim parallel to the ground.
FRONT BRAKE DISC

The brakes are the parts that
most ensure your safety and for
this reason they must always be
perfectly working.
The brake fluid must be changed once a
year by an aprilia Official Dealer.
This vehicle is provided with front hydraulic
disc brake.
When the disc pads wear out, the level of
the fluid decreases to automatically compensate for their wear.
The brake fluid reservoir (1) is positioned
near the front brake lever coupling. Periodically check the brake fluid level in the reservoir (1) and the pad wear, see p. 45
(CHECKING THE BRAKE PAD WEAR).
CHECKING
To check the brake fluid level, proceed as
follows:
◆ Position the vehicle on the centre stand.
◆ Rotate the handlebar leftwards, so that
the fluid contained in the reservoir is parallel to the ≈MIN∆ mark stamped on the
glass (2).
◆ Make sure that the level of the brake fluid
contained in the tank exceeds the ≈MIN∆
mark stamped on the glass (2).
◆ If not, provide for topping up.
TOPPING UP
Carefully read p. 22 (BRAKE FLUID recommendations).

The brake fluid may flow out of
the reservoir. Do not operate the
brake lever if the screws (3) are
loose or, most important, if the brake
fluid tank cover has been removed.

The topping up to the ≈MAX∆ level can be carried out only with
new pads.
The fluid level decreases progressively
with the pad wear.
Do not top up to the ≈MAX∆ level with
worn pads, since this may cause an outflow of liquid when the brake pads are
changed.
◆
◆
◆
◆
◆
Fill the tank with brake fluid, see p. 71
(LUBRICANT CHART), until it covers the
glass completely.
Put back the gasket (6) in its seat correctly.
Put back the guide cover (5) correctly.
Put back the cover (4).
Screw and tighten the two screws (3).
use and maintenance Sonic 50
23

Check the braking efficiency. If
necessary, contact your aprilia
Official Dealer.
In case of excessive movement of the
brake lever, of excessive elasticity or in
case there is air in the circuit, contact
your aprilia Official Dealer, since it may
be necessary to bleed the system.
REAR DRUM BRAKE

The brakes are the parts that
most ensure your safety and for
this reason they must always be
perfectly working.
For any doubt regarding the perfect
functioning of the braking system and
in case you are not able to carry out the
usual checking operations, contact
your aprilia Official Dealer.
ADJUSTING THE BRAKE
◆ Measure the distance covered by the lever before the brake starts it braking action. The idle stroke at the end of the
brake lever must be about 10 mm.
◆ Adjust the clearance by acting on the adjuster (1).
◆ Put on the brake repeatedly and make
sure that the wheel turns freely after the
brake has been released.
◆ Check the braking efficiency.
The fact that the adjuster (1) can be
tightened completely or the indicator (2)
is positioned beyond the reference
tooth (3) indicates that the brake shoes
are worn; in this case, see p. 46
(CHECKING THE SHOE WEAR).
24
use and maintenance Sonic 50
If, on the contrary, the inflation pressure
is too low, the tyre sides are under
greater stress and the tyre itself may
slip on the rim or it may become loose,
with consequent loss of control of the
vehicle.
In case of sudden braking the tyres
could even get out of the rims. Further,
the vehicle could skid while turning.
TYRES
This vehicle is provided with tyres with
inner tube.

Periodically check the tyre inflation pressure at room temperature.
If the tyres are hot, the measurement is
not correct.
Carry out the measurement especially
after long rides.
If the inflation pressure is too high, the
ground unevenness cannot be dampened and is therefore transmitted to the
handlebar, thus compromising the driving comfort and reducing the road holding during turns.
Check the surface and the wear of the
tyres, since tyres in bad conditions can
impair both the grip and the controllability of the vehicle.
Change the tyre when it is worn out or
in case of puncture on the tread side, if
the puncture is larger than 5 mm.
Use only tyres in the size suggested by
aprilia, see p. 67 (TECHNICAL DATA).
Do not install tyres with air tube on rims
for tubeless tyres and viceversa.
Make sure that the tyres always have
their valve sealing caps on, to prevent
them from suddenly going flat.
Change, reparation, maintenance and
balancing operations are very important
and should be carried out by qualified
technicians with appropriate tools.
For this reason, it is advisable to have
the above mentioned operations carried
out by an aprilia Official Dealer or by a
qualified tyre repairer.

If the tyres are new, they may
still be covered with a slippery
film: drive carefully for the first
miles.
Do not oil the tyres with unsuitable fluids.
INFLATION PRESSURE
SOLO RIDER
front: ............................... 170 kPa (1.7 bar)
rear: ................................ 190 kPa (1.9 bar)
RIDER AND ONE PASSENGER
(in the countries where this is allowed)
front: ............................... 170 kPa (1.7 bar)
rear: ................................ 210 kPa (2.1 bar)
MINIMUM TREAD DEPTH LIMIT
front: ..............................................1.5 mm
rear: ...............................................1.5 mm
use and maintenance Sonic 50
25
COOLANT



Do not use the vehicle if the
coolant is below the minimum
prescribed level.
Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the coolant level every 2000 km and
after long rides; change it every 2 years.
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°,
check the cooling circuit frequently and if
necessary increase the antifreeze concentration (up to maximum 60%).

Do not remove the expansion
tank cap when the engine is hot,
since the coolant is under pressure and its temperature is high.
If it gets in contact with the skin or with
clothes it may cause severe burns
and/or damages.
The coolant is noxious:
DO NOT SWALLOW IT.

Have the coolant changed by an
aprilia Official Dealer.
KEEP AWAY FROM CHILDREN.
DO NOT DISPOSE OF THE COOLANT IN
THE ENVIRONMENT.
26
use and maintenance Sonic 50
CHECKING AND TOPPING UP

DO NOT DISPOSE OF THE FLUID IN
THE ENVIRONMENT.
Proceed as follows:
◆ Position the vehicle on the centre stand.
◆ Unscrew and remove the filling plug (1).
Two reference elements indicating the
minimum and maximum level, ≈MIN∆ and
≈MAX∆, are provided inside the expansion tank.
◆ Looking through the filling hole, make
sure that the coolant level is included between the ≈MIN∆ and ≈MAX∆ elements.
If neither element is covered by the coolant, proceed as follows:
◆ Top up until the coolant level reaches
approximately the ≈MAX∆ element.
Do not exceed this level, otherwise the
coolant will flow out of the tank when the
engine is running.
◆ Screw the filling plug (1).

In case of excessive consumption of coolant and in case the
expansion tank remains empty,
make sure that there are no leaks in the
circuit.
Have it repaired by an aprilia Official
Dealer.
use and maintenance Sonic 50
27
AUTOMATIC
LIGHT SWITCHING VERSION
This vehicle is equipped with a device that
switches the lights on automatically when
the engine is started.
For this reason, no light switch is provided.
The lights can be switched off only by stopping the engine.
CATALYTIC SILENCER

Avoid parking the vehicle catalytic version near dry brush
wood or in places easily accessible to children, as the catalytic silencer
becomes extremely hot during use; be
very careful and avoid any kind of contact before it has completely cooled
down.
The catalytic vehicle is fitted with a silencer
with metal catalytic converter of the ≈platinum-rhodium bivalent∆ type.
This device provides for the oxidation of
the CO (carbon monoxide) and of the HC
(unburned hydrocarbons) contained in the
exhaust gases, changing them into carbon
dioxide and steam, respectively.
28
use and maintenance Sonic 50
Due to the catalytic reaction, the high temperature reached by the exhaust gases
makes for the burning of the oil particles,
thus keeping the silencer clean and eliminating the exhaust fumes.
To have the catalytic converter function
correctly and for long and to reduce possible problems regarding the soiling of the
thermal unit and of the exhaust, it is necessary to avoid covering long distances with
the engine running at constantly low rpm.
It is sufficient to alternate these periods
with periods in which the engine runs at relatively high rpm, even if only for a few seconds, but rather frequently.
What has been stated above assumes particular importance for the cold starting of
the engine: in this case, in order to reach a
rpm regime sufficient to enable the ≈priming∆ of the catalytic reaction, just make
sure that the temperature of the thermal
unit has reached at least 50°C, which generally occurs a few seconds after starting
the engine.

Do not use leaded petrol, since it
causes the destruction of the
catalytic converter.
INSTRUCTIONS FOR USE

Before departure, always carry
out a preliminary checking of the
vehicle, to make sure that it
functions correctly and safely, see the
following table PRELIMINARY CHECKING OPERATIONS.
The non-performance of these checking
operations can cause severe personal
injuries or damages to the vehicle.

Do not hesitate to consult your
aprilia Official Dealer in case
there is something you do not
understand about the functioning of
some controls or in case you suspect or
discover some irregularities.
It does not take long to carry out a
check-up and this operation ensures
you much more safety.
PRELIMINARY CHECKING OPERATIONS
Component
Front brake
Rear drum brake
Accelerator
Check
Page
Check the functioning, the fluid level and make sure
there are no leaks.
Check the wear of the pads. Top up, if necessary.
22, 23, 45
Check the functioning, the idle stroke and the control
lever conditions.
If the clearance is not correct, adjust it.
24, 46, 47
Make sure that it works smoothly and that it is possible to
open and close it completely, in all steering positions.
If necessary, adjust and/or lubricate it.
53
2 stroke oil
Check and/or top up, if necessary.
22
Wheel/tyres
Check the tyre surface, the inflation pressure, wear and
tear and any damage.
25
Brake levers
Make sure that they work smoothly.
If necessary, lubricate the articulations.
Steering
Make sure that the steering rotates smoothly, without
any clearance or slackening.
48
Centre stand, side
stand
Make sure that they work smoothly and that the spring
tension brings it back to its normal position.
If necessary, lubricate joints and hinges.
ƒ
Fastening elements
Make sure that the fastening elements are not loose.
If necessary, adjust or tighten them.
ƒ
Fuel tank
Check the fuel level and top up, if necessary.
Make sure there are no leaks or occlusions in the circuit.
21
The coolant level in the expansion tank must be included
between the ≈MIN∆ and ≈MAX∆ markings.
Top up, if necessary.
26, 27


Coolant
Lights, warning
lights, horn and
electric devices
22, 23, 24
Check the proper functioning of all the devices.
Change the bulbs or intervene in case of failure.
55 ÷ 64
use and maintenance Sonic 50
29
STARTING

Exhaust gases contain carbon
monoxide, which is extremely
noxious if inhaled.
Avoid starting the vehicle in closed or
badly-ventilated rooms.
The non-observance of this warning
may cause loss of consciousness or
even lead to death by asphyxia.
Do not get on the vehicle for the starting.
ELECTRIC STARTING
◆ Position the vehicle on the centre stand.
◆ Turn the ignition switch (1) to position
≈∆.
◆ Lock at least one wheel, by pulling a
brake lever (2).
If this operation is not carried out, the
start relay receives no current and therefore the engine does not start.
30
use and maintenance Sonic 50
◆
Press the start push button ≈∆ (3) without accelerating, then release it as soon
as the engine starts.
When the start push button ≈∆ is
pressed, the 2 stroke oil reserve
warning light ≈∆ comes on.
With the engine in running condition,
when the start push button ≈∆ is released, the 2 stroke oil reserve warning
light ≈∆ must go out; if this does not
occur, top up the 2 stroke oil tank, see
p. 22 (2 STROKE OIL TANK).

◆
If the starting is carried out with cold engine, rotate the cold start lever ≈∆ (4)
downwards.

Avoid pressing the start push
button ≈∆ (3) when the engine is
running: this may damage the
starter.
◆
Do not accelerate and pull the brake levers at the same time until you move off.
◆ Warm the engine up before leaving.
◆ Once the engine has warmed up, see
p. 15 (Coolant temperature indicator
), rotate the cold start lever ≈∆ (4)
upwards.
KICK START
For the kick start, proceed as follows:
◆ Position the vehicle on the centre stand.
◆ Move to the left side of the vehicle.
◆ Turn the ignition switch (1) to position
≈∆.
◆ To avoid losing control of the vehicle during the starting, lock both wheels by
putting on the brake levers (2).

Do not push down the kick starter with the engine on.
◆
Push down the kick starter (3) with your
right foot, releasing it immediately.
If necessary, repeat the operation until
the engine starts.
STARTING AFTER A LONG PERIOD OF
INACTIVITY
After a long period of inactivity, proceed as
follows:
◆ Turn the ignition switch (1) to position
≈∆.
◆ Make the starter run for about 10 seconds, in order to ensure the filling up of
the float chamber.
To start the engine:
◆ Rotate the cold start lever ≈∆ (4) downwards.
◆ Slightly open the throttle, then carry out
the electric starting procedure (or KICK
START).
use and maintenance Sonic 50
31

Avoid opening and closing the
throttle grip repeatedly and continuously, so that you do not accidentally lose control of the vehicle.
If you have to brake, close the throttle
and put on both brakes in order to obtain uniform deceleration, properly exerting pressure on the braking parts.
DEPARTURE AND DRIVE
By putting on the front brake only or the
rear brake only, you reduce the braking
force considerably, thus running the
risk of locking one wheel and consequently losing grip.
Release the throttle grip (pos. A), put on
the rear brake, then move the vehicle down
the stand.
Get on the vehicle, keeping at least one
foot on the ground in order not to lose balance.
Before beginning to turn, slow down or
brake driving at moderate and constant
speed or accelerating slightly; avoid
braking at the last moment: it would be
very easy to skid.

If the brakes are operated continuously
on downhill stretches, the friction surfaces can overheat, thus reducing the
braking efficiency.
Never drive with the engine off!
Properly adjust the inclination of
the rear-view mirrors.
To leave, release the brake lever and accelerate by gently rotating the throttle grip
(pos. B); the vehicle will start moving.
32
use and maintenance Sonic 50
In case of wet ground or scarce wheel
grip (snow, ice, mud, etc.), drive slowly,
avoiding sudden brakings or manoeuvres that could make you lose grip and
fall down.

Pay the utmost attention to any
obstacle or variation of the
ground.
Uneven roads, rails, manhole covers,
indications painted on the road surface,
building site metal plates become rather
slippery by rain. For this reason all
these obstacles have to be carefully
avoided, driving smoothly and bending
the vehicle as little as possible.
Always use the turn indicators timely
when you intend to change lane or direction, avoiding sharp and dangerous
movements.

If the 2 stroke oil reserve warning light ≈∆ comes on during
the normal functioning of the engine, this means that the 2 stroke oil reserve is being used; in this case, top up
the mixer oil tank, see p. 22 (2 STROKE
OIL TANK).
 If the pointer of the coolant

temperature indicator ≈∆ reaches the red area, stop the engine
and check the coolant level, see p. 26
(COOLANT).
RUNNING-IN


Remember: 1 mile = 1.6 km
1 km = 0.625 miles
After the first 500 kilometres,
carry out the checking operations indicated in the column ≈After running-in∆ of the REGULAR SERVICE INTERVALS CHART, see p. 36-37, in
order to avoid hurting yourself or other
people and/or damaging the vehicle.
The running-in of the engine is primary to
ensure its correct functioning and its correct
functioning. If possible, drive on hilly roads
and/or roads with many bends, so that the
engine, the suspensions and the brakes
undergo a more effective running-in.
For the first 500 km, keep to the following
indications:
0-100 km
During the first 100 km put on the brakes
with caution, avoiding sharp and prolonged brakings.
This ensures a correct bedding-in of the
pads on the brake disc.
0-300 km
Do not keep the throttle grip open more
than one half for long stretches.
300-500 km
Do not keep the throttle grip open more
than three-fourths for long stretches.
STOPPING
I f po s s i b le , a v o i d s t o p pi n g
abruptly, slowing down suddenly
and braking at the last moment.

◆
Release the throttle grip (pos. A) and
gradually put on the brakes to stop the
vehicle.
◆ In case of a brief stop, keep at least one
brake on.
◆
PARKING


Park the vehicle on firm and flat
ground, to prevent it from falling
down.
Neither lean the vehicle against walls,
nor lay it on the ground.
Make sure that the vehicle and especially its red-hot parts do not represent a
danger for persons and children.
Do not leave the vehicle unattended
when the engine is on or the key is inserted into the ignition switch.
Stop the vehicle, see beside (STOPPING).
◆ Turn the ignition switch (1) to position
≈∆.
◆ Position the vehicle on the stand, see
p. 34 (POSITIONING THE VEHICLE ON
THE STAND).
It is not necessary to close the
fuel tap when the engine is off,
since it is equipped with an automatic
closing system.

Never leave the key in the ignition switch.
◆
Lock the steering, see p. 18 (STEERING
LOCK) and extract the key (2).
Do not sit on the vehicle when the stand
is down.
use and maintenance Sonic 50
33
POSITIONING THE VEHICLE
ON THE STAND
Carefully read p. 33 (PARKING).
CENTRE STAND
◆ Grasp the left handgrip and the left rear
grab rail (1).
◆ Push down the stand lever (2).
SIDE STAND 
◆ Grasp the left handgrip and the left rear
grab rail (1).
◆ Push down the side stand with your right
foot, extending it completely (3).
◆ Incline the vehicle until the stand rests
on the ground (4).
◆ Steer the handlebar completely leftwards.

Make sure that the vehicle is stable.
34
use and maintenance Sonic 50
SUGGESTIONS
TO PREVENT THEFT
NEVER leave the ignition key inserted and
always use the steering lock.
Park the vehicle in a safe place, possibly in
a garage or a protected place.
If possible, use the appropriate aprilia
≈Body-Guard∆ armored cable , or an additional anti-theft device.
Make sure that all documents are in order
and the road tax has been paid.
Write down your personal data and telephone number in the space provided in this
page, to facilitate the identification of the
owner in case of finding after theft.
SURNAME: ................................................
NAME:........................................................
ADDRESS:.................................................
...................................................................
TELEPHONE NO.:.....................................

Very often stolen vehicles are
identified thanks to the data written on the use/maintenance manual.
MAINTENANCE

Risk of fire.
Keep fuel and other flammable
substances away from the electrical components.
Before beginning any service operations or inspection of the vehicle,
switch off the engine and remove the
key, wait until the engine and the exhaust system have cooled down and, if
possible, lift the vehicles with the proper equipment onto firm and flat ground.
Before proceeding, make sure that the
room in which you are working is properly ventilated.
Keep away from the red-hot parts of the
engine and of the exhaust system, in order to avoid burns.

Do not hold any mechanical
piece or other parts of the vehicle with your mouth: the components are not edible and some of them
are noxious or even toxic.

If not expressly indicated otherwise, for the reassembly of the
units repeat the disassembly operations in reverse order.
In case any maintenance operation
should be required, it is advisable to
use latex gloves.
Routine maintenance operations can usually be carried out by the user, but sometimes specific tools and specific technical
skills may be required.
In case periodic maintenance operations,
assistance or technical advice are needed,
contact an aprilia Official Dealer, who will
ensure you prompt and accurate servicing.
Ask your aprilia Official Dealer to test the
vehicle on the road after a repair or periodic maintenance operation.
In any case, personally carry out the ≈Preliminary checking operations∆ after any
maintenance operation, see p. 29 (PRELIMINARY CHECKING OPERATIONS).
use and maintenance Sonic 50
35
REGULAR SERVICE INTERVALS
CHART
OPERATIONS TO BE CARRIED OUT BY
THE aprilia Official Dealer (WHICH
CAN BE CARRIED OUT EVEN BY THE
USER).
Key
" = check and clean, adjust, lubricate or
change, if necessary;
# = clean;
$ = change;
% = adjust.
Carry out the maintenance operations more frequently if you use the
vehicle in rainy and dusty areas or
on uneven ground.

36
use and maintenance Sonic 50
Component
Battery - Terminal fastening - Electrolyte
level
Spark plug
Carburettor - idling
Air cleaner
Accelerator operation
Brake locking operation
Light system
Stop light switches
Brake fluid
2 stroke oil
Headlight beam direction - operation
Wheels/tyres and inflation pressure
Rear brake shoe wear
Front brake pad wear
After running- Every 4000
Every 8000
in [500 km
km (2500 mi) km (5000 mi)
(312 mi)]
or 12 months or 24 months
"
"
%
"
"
"
"
√
√
"
√
$
√
"
√
#
√
"
√
"
√
"
√
"
√
"
√
every 500 km (312 mi): "
√
"
√
every month: "
"
"
√
"
every 2000 km (1250 mi): "
OPERATIONS TO BE CARRIED OUT BY
THE aprilia Official Dealer.
Key
" = check and clean, adjust, lubricate or
change, if necessary;
# = clean;
$ = change;
% = adjust.
Carry out the maintenance operations more frequently if you use the
vehicle in rainy and dusty areas or
on uneven ground.

Component
Rear shock absorber
Battery - Terminal fastening
Transmission cables and controls
Variator belt
Steering tube bearings and steering
slack
Wheel bearings
Brake discs
Removal of deposits from the exhaust
Piston rings
Accelerator operation - Mixer
General running of the vehicle
Braking systems/brake discs
Cylinder cooling system
Rear brake cam pin greasing
Brake fluid
Coolant 
Fork oil and oil seal
Transmission oil
Rear pulley pins
Movable/fixed front pulley
Variator front pins and guides
Wheels/tyres and inflation pressure
Nut, bolt, screw tightening
2 stroke oil reserve warning light
Fuel pipe
Braking system pipe
Mixer oil pipe
Clutch wear
After running-in Every 4000 km Every 8000 km
[500 km (312 mi)] (2500 mi) or 12 (5000 mi) or 24
months
months
√
√
"
"
√
√
"
"
√
every 6000 km (3750 mi): $
"
"
√
"
√
"
√
#
√
every 12000 km (7500 mi): "
"
"
√
"
"
√
"
"
√
every 20000 km (12500 mi): # (outside cleaning)
√
"
√
every 2 years: $
every 2000 km (1250 mi): " / every 2 years: $
every 12000 km (7500 mi): "
every 3000 km every 12000 km
$
(7500 mi) or 2
(1875 mi): "
years: $
every 12000 km (7500 mi): $
every 6000 km (3750 mi): $
every 6000 km (3750 mi): $
"
"
√
"
"
√
"
"
√
every 4000 km (2500 mi): " / every 4 years: $
√
"
every 4 years: $
"
"
every 2 years: $
√
√
"
√
"
√
use and maintenance Sonic 50
37
IDENTIFICATION DATA
It is a good rule to write down the frame
and engine numbers in the space provided
in this manual.
The frame number can be used for the
purchase of spare parts.

Do not alter the identification
numbers if you do not want to incur severe penal and administrative
sanctions. In particular, the alteration of
the frame number results in the immediate invalidity of the guarantee.
ENGINE NUMBER
The engine number is stamped near the
lower support of the rear shock absorber.
AIR CLEANER
Engine no.
Carefully read p. 35 (MAINTENANCE).
FRAME NUMBER
The frame number is stamped on the central tube of the frame. To be able to read it,
it is necessary to remove the cover (1).
Frame no.
38
use and maintenance Sonic 50


Do not use petrol or inflammable
solvents to wash the air cleaner,
in order to avoid fires or explosions.
Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the conditions of the air cleaner and
clean it monthly or every 4000 km, depending on the conditions in which the vehicle is
used.
If the vehicle is used on dusty or wet roads,
the cleaning operations and any replacement should be carried out more frequently.
To clean the filtering element it is necessary to remove the whole filter casing from
the vehicle.

◆
√ clamp installation pliers (2).

REMOVAL
Have the appropriate special
tool  (to be requested to
aprilia Official Dealer):

Remove the front cover of the rear part
of the fairing, see p. 52 (REMOVING
THE FRONT COVER OF THE REAR
PART OF THE FAIRING).
◆ Release the hose clamp (4).
◆ Disconnect the pipe (5).
Upon reassembly, position the
pipe (5) correctly.
Upon installation, replace the
hose clamp that has been removed with a new one having
the same dimensions, to be requested
to an aprilia Official Dealer.
◆
Do not attempt to reinstall the removed
hose clamp, since it is unusable.
rectly.
Do not replace the removed hose clamp
with a screw clamp (3) or with other
types of clamp.
◆
Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
Unscrew and remove the screw (6), taking the washer.

Upon reassembly, position the
rear brake cable eyelet (7) cor-
◆
Unscrew and remove the screw (8) with
the relevant washer.
◆ Loosen the screw (9) of the air manifold
clamp.
◆ Grasp the air manifold in correspondence with the clamp and pull it, thus removing the whole air cleaner casing.
CLEANING THE AIR FILTER
◆ Unscrew the three screws (10).
◆ Remove the filter case cover (11) and
extract the filtering element (12).
◆ To clean the filtering element use clean,
non-inflammable solvents or solvents
with high volatility point, then let it dry
thoroughly.
◆ Apply a filter oil or a thick oil (SAE 80W90) on the whole surface of the filtering
element, then squeeze it to eliminate the
oil in excess.

The filter must be well impregnated, though not dripping.
use and maintenance Sonic 50
39
CHECKING
THE TRANSMISSION OIL LEVEL
◆

◆
In case of oil leaks or malfunctions, contact your aprilia Official Dealer.
◆
◆
DO NOT DISPOSE OF THE TRANSMISSION OIL IN THE ENVIRONMENT.
Carefully read p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
To check the transmission oil level, carry
out the following operations every 3000 km
or every 12 months:
◆ Drive for a few miles until the engine
reaches the normal running temperature,
see p. 15 (Coolant temperature indicator
), then stop it.
◆ Position the vehicle on the centre stand.
40
use and maintenance Sonic 50
◆
◆
◆
Put a graduated container (1) with at
least 110 cm> capacity under the drain
plug (2).
Unscrew the filling cap (3) and the oil
drain plug (2).
Let all the oil flow out of the oil pan.
Measure the quantity and if it is less than
100 cm>, top up by adding the lacking
quantity, see p. 71 (LUBRICANT
CHART).
Tighten the drain plug (2).
Provide for filling up, using the oil collected into the graduated container (1).
Tighten the filling cap (3).

Tighten the filling cap and the
drain plug thoroughly and make
sure that there are no oil leaks.
Periodically check that there are no
leaks in correspondence with the oil
pan cover seal.
Do not use the vehicle with insufficient
lubrication or with contaminated or unsuitable lubricants, since this would accelerate the wear of the moving parts
and may also cause irreparable failures.
CHANGING
THE TRANSMISSION OIL

In case of oil leaks or malfunctions, contact your aprilia Official Dealer.
DO NOT DISPOSE OF THE TRANSMISSION OIL IN THE ENVIRONMENT.
Put it in a sealed container and take it to
the filling station where you usually buy
it or to an oil salvage center.
Carefully read p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Proceed as follows:
◆ Drive for a few miles until the engine
reaches the normal running temperature,
see p. 15 (Coolant temperature indicator
), then stop the engine.
◆ Position the vehicle on the centre stand.
◆ Put a graduated container (1) with at
least 110 cm> capacity under the drain
plug (2).
◆ Unscrew the filling cap (3) and the oil
drain plug (2).
◆ Let all the oil flow out of the oil pan.
◆ Tighten the drain plug and add 100 cm>
of oil, see p. 71 (LUBRICANT CHART).
◆ Tighten the filling cap (3).

Tighten the filling cap and the
drain plug thoroughly and make
sure that there are no oil leaks.
Periodically check that there are no
leaks in correspondence with the oil
pan cover seal.
Do not use the vehicle with insufficient
lubrication or with contaminated or unsuitable lubricants, since this would accelerate the wear of the moving parts
and may also cause irreparable failures.
To ensure the efficiency and long life of the
vehicle, it is necessary to change the oil after the first 500 km and successively every
12000 km or every 2 years.
use and maintenance Sonic 50
41
FRONT WHEEL
DISASSEMBLY
Carefully read p. 35 (MAINTENANCE).

While disassembling the wheel,
be careful not to damage the
brake pipe, the disc and the
pads.
To disassemble the front wheel, proceed
as follows:
◆ Position the vehicle on the centre stand.

Prepare a 200 mm high support,
the base of which must measure
200 x 200 mm.
◆
Place the support under the vehicle and
a spongy cloth between them, so that the
front wheel can move freely and the vehicle cannot fall down.
42
use and maintenance Sonic 50

Make sure that the vehicle is stable.
◆
Unscrew and remove the two screws (1).
◆
Unscrew and remove the nut (7), taking
the washer (8).
Wheel pin-nut driving torque:
50 Nm (5 kgm).
Brake caliper screw driving torque (1):
27 Nm (2.7 kgm).
◆


Never pull the front brake lever
after removing the brake caliper,
otherwise the caliper pistons
may go out of their seats, thus causing
the outflow of the brake fluid.
In this case consult your aprilia Official
Dealer, who will carry out the proper
maintenance operation.
◆
Remove the brake caliper (2), by carefully withdrawing it from the brake disc.
◆ Unscrew the metal ring (3) and withdraw
the odometer cable (4) from the control
(5).
◆ Lock the wheel pin (6) by means of a
spanner.
Push the wheel pin (6), by carefully acting on the threaded end and using a rubber hammer if necessary.
Check the arrangement of the
speedometer drive (5) and of the
spacer ring (9), in order to be able to reassemble them correctly.
◆
Support the front wheel and extract the
wheel pin manually.
◆ Take the spacer ring (9).
◆ Remove the wheel.
◆ Disconnect the odometer control (5).

Handle with care.
Prevent the gear (10) from coming out of the odometer control (5).
◆
Reassemble the brake caliper (2), by
carefully inserting it on the brake disc.

Upon reassembly of the brake
caliper, replace the caliper fastening screws (1) with two new
screws of the same type.
◆
Screw and tighten the two screws (1).
Brake caliper screw driving torque (1):
27 Nm (2.7 kgm).

◆
REASSEMBLY
Carefully read p. 35 (MAINTENANCE).
pin (6).


◆
After reassembly, pull the front
brake lever repeatedly and
check the correct functioning of
the braking system.
While reassembling the wheel, be
careful not to damage the brake
pipe, the disc and the pads.
To reassemble the front wheel, proceed as
follows:
If the gear (10) has come out of
the odometer control (5), clean
and grease it, then reassemble it with
the crown gear (11) coupled with the
worm screw (12).
Do not force the odometer control (5)
onto the appropriate wheel hub seat
(13), in order not to break the two teeth
(A) of the gear (10).
◆
Position the odometer control (5) correctly in the appropriate seat in the wheel
hub (13).
Apply a reasonable quantity of
grease uniformly on the wheel
◆
◆
◆
◆
Position the wheel between the fork
rods.
Insert the seat (14) of the odometer control (5) in correspondence with the antirotation pin (15).
Insert the wheel pin (6) from the right
side of the vehicle (travelling direction).
Insert the spacer (9) between the hub
and the fork left rod.
Insert the washer (8), lock the rotation of
the wheel pin (6) with a spanner, screw
and tighten the nut (7).
Remove the support from under the vehicle.

Check the wheel centering.
Have the driving torques, centering and
balancing of the wheel checked by your
aprilia Official Dealer, in order to avoid
accidents that may be harmful for you
and/or other people.
Wheel pin nut driving torque:
50 Nm (5 kgm).
◆
Insert the odometer cable (4) in the control (5).
◆ Screw and tighten the metal ring (3).
use and maintenance Sonic 50
43
REAR WHEEL
DISASSEMBLY
Carefully read p. 35 (MAINTENANCE).
◆
Remove the exhaust silencer, see p. 49
(REMOVING THE EXHAUST SILENCER).

To unscrew the wheel nut (1), it
is necessary to lock the rotation
of the wheel.
◆
Pull the rear brake lever (2) completely,
then put a small piece of cardboard (3)
on the grip and keep the rear brake lever
pulled by holding it against the grip by
means of a plastic band (4).
◆ Unscrew and remove the wheel nut (1)
and the washer.

Upon reassembly, change the
wheel nut (special type).
Wheel nut driving torque:
110 Nm (11 kgm).
◆
Remove the plastic band (4) and take
the piece of cardboard (3).
◆ Release the rear brake lever.
◆ Withdraw the wheel.
44
use and maintenance Sonic 50


Use aprilia Genuine Spare Parts
only.
After reassembly, pull the rear
brake lever repeatedly and
check the correct functioning of
the braking system.
Check the wheel centering.
Have the driving torques, centering and
balancing of the wheel checked by your
aprilia Official Dealer, in order to avoid
accidents that may be harmful for you
and/or other people.
CHECKING
THE BRAKE PAD WEAR
Carefully read p. 22 (BRAKE FLUID recommendations), p. 23 (FRONT
BRAKE DISC), p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the brake pad wear after the first
500 km and successively every 2000 km.
The wear of the brake pads depends on
the use, on the kind of drive and on the
road. The wear will be greater when the vehicle is driven on dirty or wet roads.
To carry out a rapid checking of the wear of
the front pads, proceed as follows:
◆ Position the vehicle on the centre stand.
◆ Remove the brake caliper cover (1).
◆ Carry out a visual checking of the friction
material thickness by looking between
the brake caliper and the pads.
If the thickness of the friction material
(even of one pad only) has reduced to
about 1 mm, replace both pads.

Have the pads changed by your
aprilia Official Dealer.
use and maintenance Sonic 50
45
CHECKING THE SHOE WEAR
Carefully read p. 24 (REAR DRUM
BRAKE) and p. 35 (MAINTENANCE).
Check the wear of the rear brake shoes after the first 500 km and successively every
4000 km.
To verify the wear of the rear brake shoes,
proceed as follows:
◆ Pull the rear brake lever (1) completely
and keep it pulled.
◆ Check the position of the rear brake
shoe wear indicator (2).
Position
Wear condition
Rear brake shoes
within the wear limit.
Indicator between
the two reference
teeth (3) and (4).
Indicator on or
Rear brake shoes
beyond the lower
worn.
reference tooth (4). To be replaced.
46
use and maintenance Sonic 50

If the rear brake shoe wear indicator (2) is positioned on or beyond the lower reference tooth
(4), contact an aprilia Official Dealer,
who will provide for replacing the rear
brake shoes.
GREASING
THE REAR BRAKE CAM PIN

The greasing of the rear brake
cam pin can be difficult or complicated for an unskilled opera-
tor.
If necessary, contact your aprilia Official Dealer.
If you want to carry out this operation
by yourself, keep to the following instructions:
◆
Carefully read p. 35 (MAINTENANCE).


Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Grease the rear brake cam pin
every 4000 km. If the vehicle is
used on dusty roads, this operation
must be carried out more frequently.
Disassemble the rear wheel, see p. 44
(REAR WHEEL).
◆ Unscrew and remove the adjuster (5).

Do not dirt the shoes and the
friction material with grease, to
avoid compromising the braking
efficiency of the vehicle.
Upon reassembly:

Do not hit or force the cam pin
(9) with any hammer or other object.
◆
Manually insert the cam pin (9), by rotating and pushing it moderately.
◆ Put back the rear brake shoe wear indicator (2) and the pin lever (8), making
the reference marks (A) and (B) coincide
with those on the cam pin (9).

This operation may be difficult
because the springs (6) resist
considerably to the removal of
the shoes. Be careful not to crush or
bruise your hands and fingers.
◆
Grasp the inner edge of the two friction
elements (7) at its centre and, pulling toward yourself, shake the two shoes, thus
releasing them.

Before removing the pin lever
(8), mark it.
◆
Mark the cam pin (9) and the pin lever (8)
with an indelible felt-tip (10), as indicated
in the figure (A).
◆ Lock the screw (11) with an hexagon
spanner and loosen the nut (12).
◆ Remove the pin lever (8).

Before removing the rear brake
shoe wear indicator (2), mark it.
◆
Mark the cam pin (9) and the rear brake
shoe wear indicator (2) with an indelible
felt-tip (10), as indicated in the figure (B).
◆ Withdraw and remove the rear brake
shoe wear indicator (2) and the relevant
gasket.
◆ Withdraw the cam pin (9).

Moderately grease only the central part of the pin.
Avoid dirting the cam or the areas around the pin seat with grease.
◆

The wrong positioning of the
rear brake shoe wear indicator
results in the wrong measurement of the rear brake shoe wear, with
consequent risk of compromising your
safety and that of other people and of
damaging the vehicle.
◆
Put back the two friction elements (7),
coupling the plane ends (13) with the
cam pin (9) and the shaped ends (14)
with the fulcrum pin (15).

Check the correct coupling of
the springs (6).
Grease the central part of the pin by using grease for kinematic motions, see
p. 71 (LUBRICANT CHART).
use and maintenance Sonic 50
47
CHECKING THE STEERING
Carefully read p. 35 (MAINTENANCE).
Every now and then it is advisable to check
the steering, in order to verify if there are
slacks.
To check the steering it is necessary to:
◆ Position the vehicle on the centre stand.

Make sure that the vehicle is stable.
◆
Shake the fork in the direction of travel
(see figure).

Prepare a 200 mm high support,
the base of which must measure
200 x 200 mm.
Do not shake the fork excesively, otherwise you may take in
consideration the movement of the
stand, thus observing an incorrect
slack.
Repeat the previous operation more
than once.
◆
◆

Place the support under the vehicle and
a spongy cloth between them, so that the
front wheel can move freely and the vehicle cannot fall down.
48
use and maintenance Sonic 50
If you find that there is a considerable
slack, contact your aprilia Official Dealer
to restore the optimal steering conditions.
CHECKING
THE ENGINE FULCRUM AXIS
Carefully read p. 35 (MAINTENANCE).
Periodically check the slack existing between the engine pin bushings.
To carry out this operation, proceed as follows:
◆ Position the vehicle on the centre stand.
◆ Shake the wheel perpendicularly to the
direction of travel (see figure).
◆ If you find any slack, make sure that all
the fastening elements of the fulcrum
axis are well tightened.

If the slack persists, contact
your aprilia Official Dealer.
REMOVING
THE EXHAUST SILENCER
Carefully read p. 35 (MAINTENANCE).
◆

Upon installation, replace the
hose clamp that has been removed with a new one having
the same dimensions, to be requested
to an aprilia Official Dealer.
Position the vehicle on the centre stand.


Before performing the operations described below, let the
engine and the exhaust silencer
cool down until they have reached room
temperature, in order to avoid burns.
Have the appropriate special
tool  (to be requested to
aprilia Official Dealer):
√ clamp installation pliers (1).
Do not attempt to reinstall the removed
hose clamp, since it is unusable.
Do not replace the removed hose clamp
with a screw clamp (2) or with other
types of clamp.
◆
Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
◆ Release the hose clamp (3).
◆ Disconnect the pipe (4).

Upon reassembly, position the
pipe (4) correctly.

DO NOT adjust the nuts (5) of the
flange (6), but follow the procedure described below
◆
Unscrew and remove the screws (7) and
(8).
Screw (7) and (8) driving torque:
12 Nm (1.2 kgm).
◆ Unscrew and remove the two screws (9)
and (10) that fasten the exhaust silencer
to the engine.
Screw (9) and (10) driving torque:
25 Nm (2.5 kgm).
◆ Remove the exhaust silencer.

Upon reassembly, replace the
gasket positioned between the
exhaust manifold and the silencer with
a new one.
use and maintenance Sonic 50
49
REMOVING
THE FRONT HANDLEBAR COVER
Carefully read p. 35 (MAINTENANCE).
◆
Position the vehicle on the centre stand.

Support the front part of the fairing (1), in order to prevent it from
accidentally falling down.
◆
Unscrew and remove the screw (2).

Proceed with care.
Do not damage the tangs and/or
their seats.
Handle the plastic and painted components with care and avoid scraping or
damaging them.
50
use and maintenance Sonic 50
◆
◆
◆
◆
◆
Remove the front part of the fairing (1).
Remove the gasket (3).
Unscrew and remove the screws (4).
Unscrew and remove the screws (5).
Unscrew and remove the screws (6).

Handle with care.
Do not force the electric cable.
◆
Partially remove the front handlebar cover (7).
◆ Remove the blinking (A).
◆ Remove the front handlebar cover (7).
REMOVING THE REAR
HANDLEBAR COVER
Carefully read p. 35 (MAINTENANCE).
◆
Remove the front handlebar cover, see
beside (REMOVING THE FRONT HANDLEBAR COVER).
◆
◆
◆
Unscrew and remove the screw (8).
Unscrew and remove the screws (9).
Unscrew the metal ring (10) and withdraw the odometer cable from the coupling.
◆ Disconnect the two electric terminals
(11) and (12).

The rear handlebar cover (13)
(complete with switches, instruments and indicators) remains
connected to the electric cables and
therefore cannot be completely removed.
Proceed with care in order to avoid
damaging the components.
◆
Partially remove the rear handlebar cover (13).
REMOVING THE FRONT
TRANSPARENT SCREEN
REMOVING
THE REAR-VIEW MIRROR
Carefully read p. 35 (MAINTENANCE).
Carefully read p. 35 (MAINTENANCE).
◆
◆
◆
◆
Position the vehicle on the centre stand.
Rotate the handlebar completely rightwards.
◆ Unscrew and remove the screw (1).

Proceed with care.
Do not damage the tangs and/or
their seats.
Handle the plastic and painted components with care and avoid scraping or
damaging them.
◆
Rotate the handlebar to the central position.
◆ Unscrew and remove the three screws
(2).
◆ Withdraw the front cover (3) (radiator
grid (4) ) by pulling it downwards.
◆ Remove the front transparent screen (5),
together with the collar (6), by withdrawing it in the travelling direction.
Position the vehicle on the centre stand.
Lift the protection element (8).

Support the rear-view mirror (9),
to prevent it from accidentally
falling down.
◆
Keep the screw (10) locked and loosen
the nut (11) completely.
◆ Remove the rear-view mirror (9).
Upon reassembly:
Make sure that the gasket (7) is correctly
inserted in its seat.
◆
use and maintenance Sonic 50
51


REMOVING
THE INSPECTION COVER
REMOVING THE FRONT COVER OF
THE REAR PART OF THE FAIRING
Carefully read p. 35 (MAINTENANCE).
Carefully read p. 35 (MAINTENANCE).
Handle the painted components
with care and avoid scraping or
damaging them.
Handle the plastic and painted
components with care and avoid
scraping or damaging them.

Before lowering and locking the
saddle, make sure that you have
not left the key in the crash-helmet/glove compartment.
◆
◆
◆
◆
◆
◆
◆

Position the vehicle on the centre stand.
Unscrew and remove the screw (1).
Lift the front part of the inspection cover
(2) and remove it by withdrawing it in the
travelling direction.

Upon reassembly, correctly insert the two side tangs in their
seats.
52
use and maintenance Sonic 50
Position the vehicle on the centre stand.
Lift the saddle, see p. 19 (UNLOCKING/LOCKING THE SADDLE).
◆ ★ Unscrew and remove the two upper
screws (3).
◆ ★ Unscrew and remove the side screw
(4).
The front cover of the rear part of
the fairing can be removed (and
put back) only with lowered saddle.
Lower the saddle.
Remove the front cover of the rear part
of the fairing (5) by withdrawing it in the
travelling direction.
IDLING ADJUSTMENT
Carefully read p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Adjust the idling after the first 500 km and
every time it is irregular.
To carry out this operation, proceed as follows:
◆ Drive for a few miles until the engine
reaches the normal running temperature,
see p. 15 (Coolant temperature indicator
), then stop the engine.
◆ Position the vehicle on the centre stand.
◆ Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
◆ Connect an electronic revolution counter
to the spark plug cable.
◆ Start the engine.
The minimum speed of the engine (idling)
must be about 1800 ± 100 rpm; in this case
the engine does not make the rear wheel
rotate.
If necessary:
◆ Remove the front cover of the rear part
of the fairing, see p. 52 (REMOVING
THE FRONT COVER OF THE REAR
PART OF THE FAIRING).
◆ Act on the adjusting screw (1) positioned
on the carburettor.
By SCREWING IT (clockwise), you increase the engine rpm.
By UNSCREWING IT (anticlockwise), 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.

Do not act on the air adjusting
screw, to avoid variations of the
carburation setting.

If necessary, contact your aprilia
Official Dealer.
ADJUSTING
THE ACCELERATOR CONTROL
Carefully read p. 35 (MAINTENANCE).
The ideal slack of the accelerator control
should be about 2-3 mm.
To adjust the slack, proceed as follows:
◆ Position the vehicle on the centre stand.
◆ Remove the protection element (2).
◆ Loosen the nut (3) (by turning it clockwise).
◆ Act on the adjuster (4), positioned at the
beginning of the accelerator control cable.
After the adjustment:
◆ Tighten the nut (3) (by turning it anticlockwise), thus locking the adjuster (4)
and put back the protection element (2).
use and maintenance Sonic 50
53
◆
Check the spark plug gap with a thickness gauge.
The gap must be 0,5 ÷ 0,6 mm; if necessary adjust it, carefully bending the earth
electrode.
◆ Make sure that the washer is in good
conditions. With the washer on, screw
the spark plug by hand in order not to
damage the thread.
◆ Tighten the spark plug by means of the
spanner you will find in the tool kit, giving
it half a turn to compress the washer.
SPARK PLUG
Carefully read p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the spark plug after the first 500 km;
change it every 4000 km.
Periodically remove the spark plug and
clean it carefully, removing carbon deposits; change it if necessary.
To reach the spark plug:
◆ Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
54
use and maintenance Sonic 50
To remove and clean the spark plug:
◆ Take off the spark plug cap (1).
◆ Remove all the dirt from the base of the
spark plug, then unscrew it with the
spanner you will find in the tool kit and
extract it from its seat, taking care that
neither dust nor other substances enter
the cylinder.
◆ Make sure that there are neither carbon
deposits, nor corrosion marks on the
electrode and on the central porcelain
part; if necessary, clean them with the
special cleaners for spark plugs, with an
iron wire and/ or a metal brush.
◆ Energetically blow some air, in order to
prevent the removed residues from getting into the engine.
If the spark plug has crackings on the insulating material, corroded electrodes or
excessive deposits, it must be changed.

The spark plug must be well
tightened, otherwise the engine
may overheat and be seriously
damaged.
Use the recommended type of spark
plug only, see p. 67 (TECHNICAL DATA), in order not to compromise the life
and performance of the engine.
◆
◆
Position the spark plug cap (1).
Put back the inspection cover.
BATTERY
Carefully read p. 35 (MAINTENANCE).

Remember: 1 mile = 1.6 km
1 km = 0.625 miles
Check the electrolyte level and the tightening of the terminals after the first 500 km
and successively every 4000 km or 12
months.

The electrolyte in the battery is
toxic and caustic and if it gets in
contact with the skin it can
cause burns, since it contains sulphuric
acid.
Wear protection clothes, a face mask
and/or goggles during maintenance operations.
In case of contact with the skin, rinse
with plenty of water.
In case of contact with the eyes, rinse
with plenty of water for 15 minutes, then
consult an oculist without delay.
If the electrolyte is accidentally swallowed, drink a lot of water or milk, then
continue drinking milk of magnesia or
vegetable oil and consult a doctor without delay.
The battery gives off explosive gases;
keep it away from flames, sparks, cigarettes and any other source of heat.
During the recharging or the use, make
sure that the room is properly ventilated
and avoid inhaling the gases released
during the recharging.
KEEP AWAY FROM CHILDREN

Never invert the connection of
the battery cables.
Do not incline the vehicle too much, in
order to avoid dangerous leaks of the
battery fluid.
Connect and disconnect the battery
with the ignition switch in position ≈∆.
Connect first the positive cable (+) and
then the negative cable (√).
Disconnect following the reverse order.
The electrolyte is corrosive.
Do not pour or spill it, especially on the
plastic parts.
LONG INACTIVITY
OF THE BATTERY
If the vehicle remains unused for a long period:
◆ Remove the battery, see p. 56 (REMOVING THE BATTERY) and put it in a cool
and dry place.
◆ Recharge it completely, by using a trickle
charge, see p. 57 (RECHARGING THE
BATTERY).
If the battery remains on the vehicle, disconnect the cables from the terminals.
It is important to check the charge periodically (about once a month), during the winter or when the vehicle remains unused, in
order to prevent the deterioration of the
battery.
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55
CHECKING AND CLEANING THE
TERMINALS
Carefully read p. 55 (BATTERY).
◆
Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
◆ 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 special grease or Vaseline.
If necessary:
Make sure that the ignition switch is in
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 with special grease
or Vaseline.
REMOVING THE BATTERY
◆
Carefully read p. 55 (BATTERY).
◆
◆
◆
◆
◆
Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
Make sure that the ignition switch is in
position ≈∆.
Disconnect first the negative (√) and then
the positive cable (+).
Remove the battery breather pipe.
Remove the battery from its compartment and put it on a flat surface, in a cool
and dry place.

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use and maintenance Sonic 50
Once it has been removed, the
battery must be stored in a safe
place and kept away from children.
RECHARGING THE BATTERY
Carefully read p. 55 (BATTERY).
◆
◆
◆
◆
◆
CHECKING
THE ELECTROLYTE LEVEL
◆
Carefully read p. 55 (BATTERY).
◆
Remove the battery from its compartment, see p. 56 (REMOVING THE BATTERY).
◆ Make sure that the fluid level is included
between the two ≈MIN∆ and ≈MAX∆ notches stamped on the battery side.
Otherwise:
◆ Unscrew and remove the element plugs.

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.
◆
Remove the battery from its compartment, see p. 56 (REMOVING THE BATTERY).
Unscrew and remove the element plugs.
Check the electrolyte level, see beside
(CHECKING THE ELECTROLYTE LEVEL).
Connect the battery with a battery charger.
A recharge with an amperage equal to
1/10th of the battery capacity is recommended.
After the recharging operation, check the
electrolyte level again and if necessary
top up with distilled water.
Replace the element plugs.

Reinstall the battery only 5-10
minutes after disconnecting the
recharge equipment, since the
battery keeps sending out extremely inflammable hydrogen gas for a short
lapse of time.
INSTALLING THE BATTERY
Carefully read p. 55 (BATTERY).
◆
◆
Put the battery in its container.
Connect the breather pipe.

Always connect the battery
breather pipe, to prevent the sulphuric acid vapours from corroding the electric system, painted
parts, rubber elements or gaskets when
they exit the breather pipe itself.
◆
Connect, in order, the positive (+) and
negative (√) cable.
◆ Cover the terminals with special grease
or Vaseline.
◆ Put back the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
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57
CHANGING THE FUSE
Carefully read p. 35 (MAINTENANCE).

Do not repair faulty fuses.
Never use fuses different from
the recommended ones.
The use of unsuitable fuses may cause
damages to the electric system or, in
case of short circuit, even a fire.

If a fuse blows frequently, there
probably is a short circuit or an
overload in the electric system.
In this case it is advisable to consult an
aprilia Official Dealer.
If an electric component does not work or
works irregularly, or if the vehicle fails to
start, it is necessary to check the fuse (1).
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For the checking, proceed as follows:
◆ Turn the ignition switch to position ≈∆,
to avoid any accidental short circuit.
◆ Remove the inspection cover, see p. 52
(REMOVING THE INSPECTION COVER).
◆ Extract the fuse (1) and check if the filament (2) is broken.
◆ Before replacing the fuse, try to find out
the cause of the trouble, if possible.
◆ Then replace the damaged fuse with the
spare fuse (3) or with a new one having
the same amperage.

If you use one of the spare fuse
(3), put a new fuse in the suitable
seat.
ARRANGEMENT OF THE FUSE
7.5 A fuse from the battery to:
all the electric loads, excluding the light circuit, which is fed with alternate current.
ADJUSTING
THE VERTICAL HEADLIGHT BEAM
To rapidly check the correct direction of the
beam, place the vehicle on flat ground, 10
m away from a wall.
Turn on the low beam, sit on the vehicle
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).
To adjust the headlight beam:
◆ Remove the front transparent screen,
see p. 51 (REMOVING THE FRONT
TRANSPARENT SCREEN).
◆ Act on the suitable screw (1) by means
of a screwdriver.
By TURNING IT CLOCKWISE, you set
the beam upwards.
By TURNING IT ANTICLOCKWISE, you
set the beam downwards.
BULBS
Carefully read p. 35 (MAINTENANCE).

Before changing a bulb, position
the vehicle on the centre stand
and turn the ignition switch to
position ≈∆.
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 prevent it from blowing.
DO NOT FORCE THE ELECTRIC CABLES.
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CHANGING THE HEADLIGHT
BULBS
Carefully read p. 59 (BULBS).
The headlight contains:
◆ An upper, low beam bulb (1).
◆ A lower, low beam bulb (2).
To reach the bulbs, proceed as follows:
UPPER BULB
◆ Remove the front transparent screen,
see p. 51 (REMOVING THE FRONT
TRANSPARENT SCREEN).
◆ Reach the bulb protection element (3)
from above.
LOWER BULB
Open the door (4) of the glove compartment (5).
◆ Remove any object positioned in the left
part of the compartment.
◆ Unscrew and remove the screw (6).
◆ Extract the cover (7), withdrawing it from
the pin (8) present on the bottom of the
glove compartment.
◆ Reach the bulb protection element (9).
◆
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To change the bulbs, proceed as follows:
◆ Manually withdraw the protection element of the bulb to be replaced.
◆ Rotate the check tang (10) positioned at
the back of the bulb socket upwards.
◆ Extract the bulb and replace it with a new
one of the same type.

Upon reassembly of the upper
bulb protection element, position the cable outlet upwards
and on the right, in order to prevent the
cables from rubbing against the steering column cables and avoid their wear.
CHANGING THE FRONT
DIRECTION INDICATOR BULBS
Carefully read p. 59 (BULBS).
To change the bulbs:
◆ Unscrew and remove the screw (1).

When removing the protection
screen, proceed with care, in order not to break the tangs.
◆
Rotate the protection screen (2) towards
the inside, until releasing the two tangs,
then remove it.
◆ Unscrew and remove the screw (3).
◆
Rotate the coloured screen (4) towards
the inside, until releasing the tang, then
remove it.
◆ Act on the opening (5) and lock the bulb
socket (6); press the bulb (7) moderately,
rotate it anticlockwise and extract it.

To install the new bulb: introduce the bulb in the bulb socket,
making sure that the two guide pins coincide with the relevant guides on the
bulb socket.
◆
Correctly install a new bulb of the same
type.
For the reassembly:
If the bulb socket (6) has come out of its
seat:
◆ Correctly insert the tang (8) in its seat.


Correctly insert the tangs of the
coloured screen (4) and of the
protection screen (2) in their seats.
Tighten the screw (1) and the
screw (3) moderately and with
great care, in order to avoid damaging
the protection screen (2) and the coloured screen (4).

When removing the coloured
screen, proceed with care, in order not to break the tang.
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61
DASHBOARD LIGHTING BULBS

Extract the bulb sockets one by
one, in such a way as to avoid
positioning them incorrectly during the reassembly.
◆
Extract the bulb socket of the dashboard
part in which there has been a light decrease:
Pos.
CHANGING
THE DASHBOARD BULBS
Carefully read p. 59 (BULBS).
The dashboard contains:
◆ The warning light bulbs;
◆ The dashboard lighting bulbs;
To change the bulbs:

WARNING LIGHT BULBS

Extract the bulb sockets one by
one, in such a way as to avoid
positioning them incorrectly during the reassembly.
◆
Pos.
To replace the two bulbs that
light up the upper part of the
dashboard it is sufficient to remove the
front handlebar cover, see p. 50 (REMOVING THE FRONT HANDLEBAR
COVER).
◆
Remove the rear handlebar cover, see
p. 50 (REMOVING THE REAR HANDLEBAR COVER).
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Extract the relative bulb socket:
◆
Warning light
Colour
1
Direction indicators
( )
green
2
2 stroke oil reserve
()
red
3
Low beam ()
green
4
Low fuel ()
amber
Extract the bulb and replace it with one
of the same type.
◆
Lit part
5
upper right part
6
upper left part
7
lower right part
Extract the bulb and replace it with one
of the same type.
CHANGING
THE REAR LIGHT BULB
Carefully read p. 59 (BULBS).
The rear light contains:
◆ A parking light/stoplight bulb (1).
◆ Two rear direction indicator bulbs (2).
To change them:
Unscrew and remove the screws (3).
◆

While removing the protection
screen, proceed carefully in order not to break the cog.
◆
◆
Remove the protection screen (4).
Slightly press the bulb and rotate it anticlockwise.
◆ Remove the bulb from its seat.
CHANGING THE NUMBER PLATE
BULB 
Insert the bulb in the socket,
making the two bulb pins coincide with the relevant guides on the
socket.
To change the bulb:
◆
◆

Correctly install a new bulb of the same
type.

Upon reassembly, correctly position the protection screen in its
Carefully read p. 59 (BULBS).

Do not pull the electric wires to
extract the bulb socket.
Grasp the bulb socket (5) from the inside
of the rear part of the fairing cover, pull it
and remove it from its seat.
◆ Withdraw the bulb (6) and replace it with
a new one of the same type.
seat.
Tighten the screw (3) carefully, without
exerting too much pressure, in order to
avoid damaging the protection screen.
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63
TRANSPORT
◆
◆
Position the vehicle on the centre stand.
Stop the engine and wait until it has cooled down.
◆ Prepare a container with capacity exceeding the fuel quantity present in the tank
and put it on the ground on the left side
of the vehicle.
◆ Empty the fuel tank by means of a manual pump or a similar system.


Before transporting the vehicle,
it is necessary to empty the fuel
tank and the carburettor completely,
making sure that both are completely
dry. During transport, the vehicle must
be held upright, in its normal use position, to avoid any oil and battery fluid
leakage.
DRAINING THE FUEL TANK
Carefully read p. 21 (FUEL).


Risk of fire.
Wait until the engine and the
exhaust silencers have completely cooled down.
Fuel vapours are noxious for
your health.
Before proceeding, make sure
that the room in which you are working
is properly ventilated.
Do not inhale fuel vapours.
Do not smoke, nor use free flames.
Do not dispose of fuel in the environment.
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After draining the tank, tighten
the plug.
To empty the carburettor completely, proceed as follows:
◆ Remove the filter casing, see p. 38 (AIR
CLEANER).
◆ Put the free end of the pipe (1) into a receptacle.
◆ Open the carburettor outlet by loosening
the drain screw (2) positioned under the
float chamber.
When all the fuel has flowed out of the carburettor:
◆ Tighten the drain screw (2) completely.

Tighten the drain screw (2) with
care, to avoid fuel leakages from
the carburettor during the refuelling.
CLEANING

After the vehicle has been
washed, its braking functions
could be temporarily impaired
because of the presence of water on the
grip surfaces. Calculate long braking
distances to avoid accidents. Brake repeatedly to restore normal conditions.
Carry out the preliminary checking operations, see p. 29 (PRELIMINARY
CHECKING OPERATIONS).
Clean the vehicle frequently if it used in
particular areas or conditions, such as:
◆ Polluted areas (cities and industrial areas).
◆ Areas characterized by an high percentage of salinity and humidity (sea areas,
hot and humid climates).
◆ Particular conditions (use of salt and
anti-ice chemical products on the roads
during the winter).
◆ Avoid leaving deposits of industrial and
polluting powders, tar spots, dead insects, bird droppings, etc. on the body.
◆ Avoid parking the vehicle under trees,
since in some seasons residues, resins,
fruits or leaves fall down, which contain
substances that may damage the paint.
To remove dirt and mud from the painted
surfaces use a low- pressure water jet;
carefully wet the dirty parts, remove mud
and filth with a soft car sponge impregnated with a lot of water and shampoo (2÷4%
parts of shampoo in water).
Then rinse with plenty of water and dry with
chamois leather.
To clean the outer parts of the engine use
a degreaser, brushes and wipers.

Polish with silicone wax only after having carefully washed the
vehicle.
Do not wash the vehicle under the sun,
especially during the summer, when the
body is still warm, since if the shampoo
dries before being rinsed away, it can
damage the paint.
Do not use polishing pastes on matt
paints.
Do not use water (or liquids) at a temperature exceeding 40°C to clean the
plastic components of the vehicle.
Use neither high pressure water/air jets,
nor vapour jets on the following parts:
wheel hubs, controls on the right and
on the left side of the handlebars, bearings, carburettor, brake pump, instruments and indicators, silencer exhaust,
glove
compartment,
ignition
switch/steering lock.
Do not use alcohol, petrol or solvents to
clean the rubber and plastic parts and
the saddle: use only water and mild
soap.

Do not apply protection waxes
onto the saddle, in order not to
make it too slippery.
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65
LONG PERIODS OF INACTIVITY
After a long period of inactivity of the vehicle some precautions are necessary to
avoid any problem.
Further, it is important to carry out the necessary repairs and a general check up before the period of inactivity, since you could
forget to carry them out later.
Proceed as follows:
◆ Empty the fuel tank and the carburettor,
see p. 64 (DRAINING THE FUEL
TANK).
◆ Extract the spark plug and pour a teaspoon (5-10 cm>) of two-stroke engine oil
into the cylinder.
Move the ignition switch to position ≈∆,
press the start push button ≈∆ for a few
seconds, to distribute the oil evenly on
the cylinder surfaces.
Put back the spark plug.
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use and maintenance Sonic 50
◆
◆
◆
◆
◆
◆
◆
Remove the battery, see p. 56 (REMOVING THE BATTERY).
Wash and dry the vehicle, see p. 65
(CLEANING).
Polish the painted surfaces with wax.
Inflate the tyres, see p. 25 (TYRES).
By means of a suitable support, position
the vehicle so that both tyres are raised
from the ground.
Place the vehicle in an unheated, not-humid room, away from sunlight, with minimum temperature variations.
Cover the vehicle avoiding the use of
plastic or waterproof materials.
AFTER A PERIOD OF INACTIVITY
◆
◆
◆
◆
◆
Uncover and clean the vehicle, see p. 65
(CLEANING).
Check the electrolyte level in the battery
and install it, see p. 57 (CHECKING THE
ELECTROLYTE LEVEL) and p. 57 (INSTALLING THE BATTERY).
Make sure that the fuel drain screw is
thoroughly screwed (breather pipe closing index), see p. 64 (DRAINING THE
FUEL TANK).
Refuel, see p. 21 (FUEL).
Carry out the preliminary checking operations, see p. 29 (PRELIMINARY
CHECKING OPERATIONS).

Have a test ride at moderate
speed in a low-traffic area.
TECHNICAL DATA
DIMENSIONS
Max. length ..................................................... 1680 mm
Max. width.......................................................
680 mm
Max. height (front part of the fairing included) 1070 mm
Seat height......................................................
795 mm
Distance between centres............................... 1180 mm
ENGINE
Min. ground clearance ....................................
155 mm
Weight ready for starting.................................
80 kg
Weight ready for starting  ..........................
87 kg
Type ................................................................ MINARELLI, 2-stroke with controlled ignition
Number of cylinders ........................................ 1
Total displacement .......................................... 49.26 cm>
Bore/stroke...................................................... 40 mm / 39.2 mm
Compression ratio ........................................... 12.5 ± 0.5:1
Starting............................................................ electric + kick starter
Clutch.............................................................. centrifugal
Change gear ................................................... automatic stepless variator
Cooling............................................................ with forced air
Cooling  ..................................................... liquid cooled
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67
CAPACITY
Fuel (reserve included).................................... 8 b
Fuel reserve..................................................... 1,5 b
Transmission oil............................................... 100 cm>
Mixer oil (reserve included) ............................. 1.6 b
Mixer oil reserve .............................................. 0.5 b
Coolant  ...................................................... 1 b (50% antifreeze + 50% water)
Seats ............................................................... 1 (2 in the countries where this is allowed)
Vehicle max. load
(driver + luggage) ............................................ 105 kg
(driver+passenger+luggage) ........................... 180 kg (in the countries where this is allowed)
TRANSMISSION
Speed change gear ......................................... automatic and stepless
Primary ............................................................ V-belt
Ratios .............................................................. minimum for stepless change: 2.6
maximum for stepless change: 0.862
Secondary ....................................................... with gears
CARBURETTOR
Model:
√ standard....................................................... DELL»ORTO PHBN 12
√ alternative .................................................... TEI KEI TK 3AA
Choke tube ...................................................... Æ12 mm
FUEL SUPPLY
68
Fuel ................................................................. unleaded petrol according to the DIN 51607 standard, min. O.N. 95
(N.O.R.M.) and 85 (N.O.M.M.)
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FRAME
Type ................................................................ one-beam, split in two cradles
SUSPENSIONS
Front................................................................ hydraulically operated telescopic fork
Stroke.............................................................. 65 mm
Rear ................................................................ hydraulic mono-shock absorber
Stroke.............................................................. 70 mm
BRAKES
Front................................................................ disc brake, Æ155 mm with hydraulic transmission
Rear ................................................................ drum brake, Æ110 mm, with mechanic transmission
WHEELS
RIMS ............................................................... alloy
Front................................................................ 2.50 x 10"
Rear ................................................................ 2.50 x 10"
TYRES ............................................................ tubeless
Front................................................................ 100/90 - 10" - 56J
Rear ................................................................ 100/90 - 10" - 56J
STANDARD INFLATION PRESSURE
Front................................................................ 170 kPa (1.7 bar)
Rear ................................................................ 190 kPa (1.9 bar)
INFLATION PRESSURE WITH PASSENGER (where drive with passenger is allowed)
Front................................................................ 170 kPa (1.7 bar)
Rear ................................................................ 210 kPa (2.1 bar)
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69
IGNITION
Type................................................................. CDI
Spark advance................................................. 14° ± 2° before T.D.C.
Standard spark plug ........................................ NGK BR8 HS
Standard spark plug  .................................. NGK BR8 HS
Spark plug gap ................................................ 0.5 ÷ 0.6 mm
Engine idle rpm................................................ 1800 ± 100 rpm
ELECTRIC
SYSTEM
Battery ............................................................. 12 V - 4 Ah
Fuse................................................................. 7.5 A
Generator (with permanent magnet) ............... 12 V - 85 W
Low beam bulbs .............................................. 12 V - 15 W
Direction indicator bulbs .................................. 12 V - 10 W
Rear parking light/stoplight bulb ...................... 12 V - 5/21 W
Number plate bulb ..................................... 12 V - 3 W
Dashboard bulbs ............................................. 12 V - 1.2 W
Low beam warning light................................... 12 V - 1.2 W
Direction indicators warning light..................... 12 V - 2 W
2 stroke oil reserve warning light ..................... 12 V - 2 W
Low fuel warning light ...................................... 12 V - 1.2 W
70
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LUBRICANT CHART
0
Transmission 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.
0
GREEN HIT 2 or
CITY 2T.
Mixer oil (recommended):
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.
0
0
F.A. 5W or
F.A. 20W fork oil;
an alternative
FORK 5W or
FORK 20W fork oil.
If you need an oil with intermediate characteristics in comparison with the
F.A. 5W and
F.A. 20W or
FORK 20W, these can be mixed as indicated below:
Fork oil (recommended):
SAE 10W =
0
0
FORK 5W and
0 F.A. 5W 67% of the volume + 0 F.A. 20W 33% of the volume, or
FORK 5W 67% of the volume +
FORK 20W 33% of the volume;
0 F.A. 5W 33% of the volume + 0 F.A. 20W 67% of the volume, or
FORK 5W 33% of the volume +
FORK 20W 67% of the volume.
GREASE 30.
Bearings and other lubrication points (recommended): 0 AUTOGREASE MP or
SAE 15W =
As an alternative to the recommended product, use high-quality grease for rolling bearings, working temperature range -30°C.... +140°C,
dripping point 150°C... 230°C, high protection against corrosion, good resistance to water and oxidation.
Protection of the battery poles: neutral grease or vaseline.
aWARNING
Use new brake fluid only.
Brake fluid (recommended):
0 F.F., DOT 5 (DOT 4 compatible) or
BRAKE 5.1, DOT 5 (DOT 4 compatible).
aWARNING
Use only antifreeze and anticorrosive without nitrite, ensuring protection at -35°C at least.
Engine coolant (recommended):
0 ECOBLU - 40°C or
COOL.
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71
NOTE
ASK FOR GENUINE SPARE PARTS ONLY
72
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NOTE
ASK FOR GENUINE SPARE PARTS ONLY
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73
Importers
74
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Importers
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75
WIRING DIAGRAM Sonic 50
76
use and maintenance Sonic 50
WIRING DIAGRAM KEY Sonic 50
1) Generator
2) CDI
3) Spark plug
4) HT coil
5) Voltage regulator
6) Battery
7) Starter
8) Start relay
9) Front stoplight switch
10) Rear stoplight switch
11) 2 stroke oil reserve switch
13 Fuel level sensor
14) Rear right direction indicator
15) Rear light
16) Rear left direction indicator
17) Bridge
18) Horn push button
19) Ignition switch/steering lock
20) Control diode
21) Coolant thermistor 
22) Blinking
23) Dashboard
24) Direction indicator warning light
25) 2 stroke oil reserve warning light
26) Dashboard light
27) Fuel level instrument
28) Low fuel warning light
29) Low beam warning light
30)
31)
32)
33)
34)
35)
36)
37)
38)
39)
41)
42)
Coolant temperature instrument 
Front right direction indicator
Front left direction indicator
Front parking light
Low beam bulb
Horn
Pick up
Fuse
Multiple connectors
Rear parking light/stoplight
Direction indicator switch
Start push button
CABLE COLOURS
Ar
Az
B
Bi
G
Gr
M
N
R
V
Vi
Orange
Light blue
Blue
White
Yellow
Grey
Brown
Black
Red
Green
Violet
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77
NOTE
ASK FOR GENUINE SPARE PARTS ONLY
78
use and maintenance Sonic 50
NOTE
ASK FOR GENUINE SPARE PARTS ONLY
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79
aprilia s.p.a. wishes to thank its customers for the purchase of this vehicle.
√ Do not dispose of oil, fuel, polluting substances and components in the environment.
√ Do not keep the engine running if it isn»t necessary.
√ Avoid disturbing noises.
√ Respect nature.
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use and maintenance Sonic 50
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