4EM-AE1
YFM80WP
4EM-AE1
SUPPLEMENTARY
SERVICE MANUAL
FOREWORD
This Supplementary Service Manual has been prepared to introduce new service and new data for
the YFM80WP. For complete information on service procedures, it is necessary to use this Supplementary Service Manual together with the following manual.
YFM80(D) SERVICE MANUAL: 4EM-28197-20
YFM80WP
SUPPLEMENTARY
SERVICE MANUAL
 2001 by Yamaha Motor Co., Ltd.
First Edition, September 2001
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
EB001000
NOTICE
This manual was produced by the Yamaha Motor Company primarily for use by Yamaha dealers
and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one
manual, so it is assumed that anyone who uses this book to perform maintenance and repairs on
Yamaha machine has a basic understanding of the mechanical ideas and the procedures of
machine repair. Repairs attempted by anyone without this knowledge are likely to render the
machine unsafe and unfit for use.
Yamaha Motor Company, Ltd. is continually striving to improve all its models. Modifications and significant changes in specifications or procedures will be forwarded to all authorized Yamaha dealers
and will appear in future editions of this manual where applicable.
NOTE:
Designs and specifications are subject to change without notice.
IMPORTANT INFORMATION
Particularly important information is distinguished in this manual by the following notations.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!
WARNING
CAUTION:
NOTE:
Failure to follow WARNING instructions could result in severe injury or death
to the machine operator, a bystander or a person inspecting or repairing the
machine.
A CAUTION indicates special precautions that must be taken to avoid damage to the machine.
A NOTE provides key information to make procedures easier or clearer.
EB002000
HOW TO USE THIS MANUAL
MANUAL ORGANIZATION
This manual consists of chapters for the main categories of subjects. (See “Illustrated symbols”)
1st title 1: This is the title of the chapter with its symbol in the upper right corner of each page.
2nd title 2: This title indicates the section of the chapter and only appears on the first page of each
section. It is located in the upper left corner of the page.
3rd title 3: This title indicates a sub-section that is followed by step-by-step procedures accompanied by corresponding illustrations.
EXPLODED DIAGRAMS
To help identify parts and clarify procedure steps, there are exploded diagrams at the start of each
removal and disassembly section.
1. An easy-to-see exploded diagram 4 is provided for removal and disassembly jobs.
2. Numbers 5 are given in the order of the jobs in the exploded diagram. A number that is enclosed
by a circle indicates a disassembly step.
3. An explanation of jobs and notes is presented in an easy-to-read way by the use of symbol marks
6. The meanings of the symbol marks are given on the next page.
4. A job instruction chart 7 accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
5. For jobs requiring more information, the step-by-step format supplements 8 are given in addition
to the exploded diagram and the job instruction chart.
1
EB003000
2
GEN
INFO
ILLUSTRATED SYMBOLS
Illustrated symbols 1 to 9 are printed on the
top right of each page and indicate the subject
of each chapter.
SPEC
3
4
CHK
ADJ
1 General information
2 Specifications
3 Periodic checks and adjustments
4 Engine
5 Carburetion
6 Drive train
7 Chassis
8 Electrical
9 Troubleshooting
ENG
5
6
CARB
DRIV
7
8
CHAS
–
ELEC
+
0
Illustrated symbols 0 to F are used to identify
the specifications appearing in the text.
A
B
0 Filling fluid
A Lubricant
B Special tool
C Torque
D Wear limit, clearance
E Engine speed
F Ω, V, A
C
D
9
TRBL
SHTG
T.
R.
E
F
G
H
G
E
J
K
B
M
L
M
M
LS
N
Illustrated symbols G to M in the exploded
diagrams indicate the types of lubricants and
lubrication points.
I
S
O
LT
New
G Apply engine oil
H Apply gear oil
I Apply molybdenum disulfide oil
J Apply wheel bearing grease
K Apply lightweight lithium soap base grease
L Apply molybdenum disulfide grease
M Apply silicon grease
Illustrated symbols N to O in the exploded
diagrams indicate where to apply a locking
agent N and when to install a new part O.
N Apply the locking agent (LOCTITE)
O Replace
CONTENTS
GENERAL INFORMATION ..............................................................................1
MACHINE IDENTIFICATION ....................................................................1
VEHICLE IDENTIFICATION NUMBER .................................................1
MODEL LABEL .....................................................................................1
SPECIFICATIONS ............................................................................................2
GENERAL SPECIFICATIONS ..................................................................2
MAINTENANCE SPECIFICATIONS .........................................................3
ENGINE ................................................................................................3
CHASSIS ..............................................................................................5
ELECTRICAL ........................................................................................5
CABLE ROUTING .....................................................................................7
PERIODIC CHECKS AND ADJUSTMENTS ..................................................11
INTRODUCTION .....................................................................................11
PERIODIC MAINTENANCE/LUBRICATION INTERVALS ......................11
SEAT, FENDERS AND FUEL TANK ......................................................12
SEAT AND FRONT PANEL ................................................................12
FRONT FENDER ................................................................................13
REAR FENDER ..................................................................................14
FUEL TANK ........................................................................................15
ENGINE ...................................................................................................16
SPEED LIMITER ADJUSTMENT ........................................................16
AIR FILTER CLEANING .....................................................................17
MACHINE IDENTIFICATION
GEN
INFO
GENERAL INFORMATION
MACHINE IDENTIFICATION
VEHICLE IDENTIFICATION NUMBER
The vehicle identification number 1
stamped into the left side of the frame.
is
MODEL LABEL
The model label 1 is affixed to the frame. This
information will be needed to order spare
parts.
–1–
GENERAL SPECIFICATIONS
SPEC
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model
Model code number:
Dimensions:
Overall length
Overall width
Overall height
Seat height
Wheelbase
Minimum ground clearance
Minimum turning radius:
Oil type or grade:
Engine oil
YFM80WP
5TH1 (For Oceania)
5TH2 (For CDN)
5TH3 (For Europe)
1,537 mm (60.5 in)
841 mm (33.1 in)
940 mm (37 in)
669 mm (26.3 in)
1,030 mm (40.6 in)
100 mm (3.9 in)
2,400 mm (94.5 in)
API service SE type or higher
Final gear oil
Fuel:
Type
Tank capacity
Reserve amount
Spark plug:
Type/Manufacturer
Gap
Tire:
Type
Size
Manufacturer (type)
<Wear limit>
Indicator light wattage × quantity:
“NEUTRAL”
SAE 80API “GL-4” Hypoid gear oil
Unleaded gasoline (For Oceania)
Regular unleaded gasoline
(For CDN and Europe)
6.8 L (1.5 Imp gal, 1.8 US gal)
0.9 L (0.2 Imp gal, 0.2 US gal)
CR7HS (NGK)
0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Front
Rear
Tubeless
Tubeless
AT18 × 7-7
AT18 × 8-7
DUNLOP
DUNLOP
KT586
KT587
<3 mm (0.12 in)>
<3 mm (0.12 in)>
12 V 1.7 W × 1
–2–
MAINTENANCE SPECIFICATIONS
SPEC
MAINTENANCE SPECIFICATIONS
ENGINE
Model
YFM80WP
Camshaft:
Drive method
Cam dimensions:
Intake:
Chain drive (Left)
Exhaust:
A
“A”
“B”
“A”
“B”
25.30 ~ 25.31 mm (0.996 ~ 0.997 in)
20.994 ~ 21.094 mm (0.827 ~ 0.831 in)
25.301 ~ 25.311 mm (0.996 ~ 0.997 in)
21.021 ~ 21.121 mm (0.828 ~ 0.832 in)
B
Camshaft runout limit
Cam chain type/number of links
Cam chain adjustment method
Rocker arm/rocker arm shaft:
Bearing inside diameter
Shaft outside diameter
Arm-to-shaft clearance
<Limit>
Valve spring:
Free length:
<0.03 mm (0.0012 in)>
BUSH CHAIN/82 links
Manual
10.000 ~ 10.015 mm (0.3937 ~ 0.3943 in)
9.981 ~ 9.991 mm (0.3930 ~ 0.3934 in)
0.009 ~ 0.034 mm (0.0004 ~ 0.0013 in)
<0.08 mm (0.0032 in)>
IN
EX.
<Limit>
IN
EX.
Compressed length (valve closed):
IN
EX.
Compressed spring force (installed):
IN
EX.
<Tilt Limit>
IN & EX.
*
28.63 mm (1.13 in)
28.63 mm (1.13 in)
<25.4 mm (1.00 in)>
<25.4 mm (1.00 in)>
24.9 mm (0.980 in)
24.9 mm (0.980 in)
86.3 ~ 105.9 N (8.8 ~10.8 kgf)
86.3 ~ 105.9 N (8.8 ~10.8 kgf)
<2.5° or 1.2 mm (0.047 in)>
Direction of winding (top view):
IN
–3–
EX
MAINTENANCE SPECIFICATIONS
Model
YFM80WP
Piston:
Piston size “D”
Measuring point “H”
Piston over size: 2nd
D
4th
Offset
Offset direction
Piston clearance
<Limit>
Piston pin bore inside diameter
Piston pin outside diameter
Clutch:
Friction plate:
Thickness × Quantity
<Wear limit>
Clutch plate:
Thickness × Quantity
<Warp limit>
Clutch spring:
Free length × Quantity
Clutch release method
Clutch-in revolution
Clutch-stall revolution
Carburetor:
Type/manufacturer/quantity
I. D. mark
Main jet
Main air jet
Jet needle-clip position
Needle jet
Cutaway
Pilot jet
Pilot outlet
Pilot screw
Valve seat
Fuel level
Float height
Engine idling speed
Intake vacuum
SPEC
46.960 ~ 46.975 mm (1.8488 ~ 1.8494 in)
6.5 mm (0.256 in)
(From bottom line of piston skirt)
H 47.50 mm (1.870 in)
48.00 mm (1.890 in)
0.75 mm
Intake side
0.025 ~ 0.045 mm (0.0010 ~ 0.0018 in)
<0.15 mm (0.006 in)>
13.002 ~ 13.013 mm (0.5119 ~ 0.5123 in)
12.996 ~ 13.000 mm (0.5117 ~ 0.5118 in)
2.92 ~ 3.08 mm (0.115 ~ 0.121 in) × 6
<2.9 mm (0.114 in)>
1.2 ~ 1.6 mm (0.047 ~ 0.063 in) × 5
<0.06 mm (0.0024 in)>
28.3 mm (1.11 in) × 8
Inner push, cam push
2,100 ~ 2,300 r/min
2,800 ~ 3,000 r/min
(M.J.)
(M.A.J.)
(J.N.)
(N.J.)
(C.A.)
(P.J.)
(P.O.)
(P.S.)
(V.S.)
(F.L.)
(F.H.)
VM16SH/MIKUNI/1
5TH1 00
#76.3
ø1.2
3PZ 13-2
D-8M
3.5
#12.5
ø0.7
1-1/8
ø1.2
2.5 ~ 4.5 mm (0.10 ~ 0.18 in)
Below carburetor body edge
20.0 ~ 22.0 mm (0.79 ~ 0.87 in)
1,750 ~ 1,850 r/min
36 kPa (270 mmHg)
–4–
MAINTENANCE SPECIFICATIONS
SPEC
CHASSIS
Model
YFM80WP
Wheel:
Front wheel type
Rear wheel type
Front rim size/material
Rear rim size/material
Rim runout limit:
Vertical
Lateral
Brake lever & brake pedal:
Brake lever free play (front brake)
Brake lever free play (rear brake)
Brake pedal free play
Panel wheel
Panel wheel
7 × 5.5 AT/steel
7 × 6.5 AT/steel
<2.0 mm (0.08 in)>
<2.0 mm (0.08 in)>
10 ~ 12 mm (0.4 ~ 0.5 in) at lever pivot
5 ~ 8 mm (0.20 ~ 0.31 in) at lever pivot
20 ~ 30 mm (0.8 ~ 1.2 in)
ELECTRICAL
Model
YFM80WP
CDI:
Magneto model/manufacturer
Pickup coil resistance (color)
Source coil resistance (color)
Lighting coil resistance (color)
CDI unit model/manufacturer
Ignition coil:
Model/manufacturer
Minimum spark gap
Primary winding resistance
Secondary winding resistance
Rectifier/regulator:
Type
Model/manufacturer
No load regulated voltage
Capacity
Withstand voltage
F2FM/MORIC
264 ~ 396 Ω at 20°C (68°F) (W/L–W/R)
304 ~ 456 Ω at 20°C (68°F) (G/W–B/R)
0.72 ~ 1.08 Ω B–W
0.32 ~ 0.48 Ω B–Y/R
4EM/MORIC
2JN/MORIC
6 mm (0.24 in)
0.184 ~ 0.276 Ω at 20°C (68°F)
6.32 ~ 9.48 Ω at 20°C (68°F)
(DC)
(AC)
(DC)
(AC)
Semi conductor-short circuit
SH704-12/SHINDENGEN
14 ~ 15 V
13 ~ 14 V
5A
8A
200 V
–5–
MAINTENANCE SPECIFICATIONS
Model
Electric starter system:
Type
Starter motor: Model/manufacturer
Out put
Armature coil resistance
Brush:
Overall length
<Limit>
Spring pressure
Commutator: Diameter
<Wear limit>
Mica undercut
Starter relay: Model/manufacturer
Amperage rating
Coil winding resistance
Starting circuit cut-off relay:
Model/manufacturer
Coil winding resistance
Diode
Circuit breaker:
Type
Amperage for individual circuit/quantity:
Main
Reserve
SPEC
YFM80WP
Constant mesh type
ADB4A5/DENSO
0.2 kW
0.0288 ~ 0.0352 Ω at 20°C (68°F)
6 mm (0.24 in)
<3.5 mm (0.14 in)>
3.24 ~ 4.22 N (330 ~ 430 gf)
16.5 mm (0.65 in)
<15.5 mm (0.61 in)>
1.0 mm (0.04 in)
MS5D-611/JIDECO
100A
3.87 ~ 4.73 Ω at 20°C (68°F)
ACA12115-3/MATSUSHITA
72 ~ 88 Ω at 20°C (68°F)
Yes
Fuse
5A×1
5A×1
–6–
CABLE ROUTING
SPEC
CABLE ROUTING
1 Throttle cable
2 Fuel tank breather hose
3 Carburetor ventilation hose
4 Final gear case breather hose
5 Crankcase breather hose
6 Fuel hose
7 Band
8 Starter relay
9 Starting circuit cut-off relay
0 Rectifier/regulator
A Battery breather hose
B CDI magneto lead
C Carburetor overflow hose
D Front brake cable (right)
E Front brake cable (left)
È Pass the final gear case breather hose through
the guide.
É Pass the battery breather hose through the hole.
–7–
CABLE ROUTING
1 Rear brake cable
2 Band
3 Wireharness
4 Ignition coil
5 Handlebar switch lead
6 Rear brake switch lead
7 “NEUTRAL” indicator light lead
8 Main switch
9 CDI unit
0 Fuel hose
A Front brake cable
B Fuel tank breather hose
C Throttle cable
–8–
SPEC
CABLE ROUTING
1 Fuel tank breather hose
2 Throttle cable
3 Front brake cable (left)
4 Front brake cable (right)
5 Air filter joint
6 Rear brake switch lead
7 Handlebar switch lead
8 “NEUTRAL” indicator light lead
9 Rear brake cable
–9–
SPEC
CABLE ROUTING
1 Front brake cable
2 Throttle cable
3 Fuel tank breather hose
4 Battery negative lead
5 Fuse
6 Battery positive lead
7 Band
8 Handlebar switch
9 Rear brake switch
0 Rear brake cable
SPEC
È Pass the leads through the hole.
– 10 –
INTRODUCTION/PERIODIC MAINTENANCE/
LUBRICATION INTERVALS
CHK
ADJ
EB300000
PERIODIC CHECKS AND ADJUSTMENTS
INTRODUCTION
This chapter includes all information necessary to perform recommended inspections and adjustments. These preventive maintenance procedures, if followed, will ensure more reliable vehicle
operation and a longer service life. The need for costly overhaul work will be greatly reduced. This
information applies to vehicles already in service as well as to new vehicles that are being prepared
for sale. All service technicians should be familiar with this entire chapter.
EB301000
PERIODIC MAINTENANCE/LUBRICATION INTERVALS
INITIAL
ITEM
ROUTINE
1
month
Valves*
• Check valve clearance.
• Adjust if necessary.
Cam chain*
• Check chain tension.
• Adjust if necessary.
Spark plug
• Check condition.
• Adjust gap and clean.
• Replace if necessary.
Air filter element
• Clean.
• Replace if necessary.
Carburetor*
• Check idle speed/choke lever operation.
• Adjust if necessary.
Crankcase breather
system*
• Check breather hose for cracks or damage.
• Replace if necessary.
Exhaust system*
• Check for leakage.
• Retighten if necessary.
• Replace gasket if necessary.
Fuel line*
• Check fuel hose for cracks or damage.
• Replace if necessary.
Engine oil
• Replace (warm engine before draining).
Final gear oil
• Check oil level/oil leakage.
• Replace every 12 months.
Brakes*
• Check operation.
• Adjust if necessary.
Clutch*
• Check operation.
• Adjust if necessary.
Wheels*
• Check balance/damage/runout.
• Replace if necessary.
Wheel bearings*
• Check bearing assemblies for looseness/damage.
• Replace if damaged.
Steering system*
•
•
•
•
Knuckle shafts/
steering shaft*
• Lubricate every 6 months.**
Fittings and fasteners*
• Check all chassis fittings and fasteners.
• Correct if necessary.
Battery*
• Check specific gravity.
• Check breather hose for correct routing.
• Correct if necessary.
3
months
EVERY
6
months
6
months
Every 20 ~ 40 hours
(more often in wet or dusty areas.)
Check operation.
Repair if damaged.
Check toe-in.
Adjust if necessary.
* It is recommended that these items be serviced by a Yamaha dealer.
** Lithium-soap-based grease.
– 11 –
1
year
SEAT, FENDERS AND FUEL TANK
CHK
ADJ
SEAT, FENDERS AND FUEL TANK
SEAT AND FRONT PANEL
1
3
4
5
2
Order
1
Job name/Part name
Removing the seat and front panel
Seat
2
3
4
5
Front panel
Fuel tank breather hose
Handlebar cover
Neutral indicator light leads
Q’ty
1
1
1
1
2
– 12 –
Remarks
Remove the parts in the order below.
NOTE:
Pull back the seat lock lever, than pull up
on the rear of the seat.
Disconnect
For installation, reverse the removal
procedure.
SEAT, FENDERS AND FUEL TANK
CHK
ADJ
FRONT FENDER
1
4
2
T.
R.
Order
1
2
3
4
7 Nm (0.7 m • kg, 5.1 ft • Ib)
3
Job name/Part name
Removing the front fender
Seat and front panel
Fuel tank top panel
Air cleaner joint clamp screw
Main switch
Front fender
Q’ty
1
1
1
1
Remarks
Remove the parts in the order below.
Refer to “SEAT AND FRONT PANEL”.
Loosen
For installation, reverse the removal
procedure.
– 13 –
CHK
ADJ
SEAT, FENDERS AND FUEL TANK
REAR FENDER
T.
T.
R.
R.
7 Nm (0.7 m • kg, 5.1 ft • Ib)
7 Nm (0.7 m • kg, 5.1 ft • Ib)
3
1
5
6
4
2
3
Order
1
2
3
Job name/Part name
Removing the rear fender
Seat
Front fender
Battery band
Main fuse
Battery lead
Q’ty
1
1
2
Remarks
Remove the parts in the order below.
Refer to “SEAT AND FRONT PANEL”.
Refer to “FRONT FENDER”.
Disconnect.
CAUTION:
First disconnect the negative lead,
then disconnect the positive lead.
4
5
6
Battery breather hose
Battery
Rear fender
1
1
1
For installation, reverse the removal
procedure.
– 14 –
SEAT, FENDERS AND FUEL TANK
CHK
ADJ
FUEL TANK
2
T.
R.
10 Nm (1.0 m • kg, 7.2 ft • Ib)
1
Order
1
Job name/Part name
Removing the fuel tank
Seat and front panel
Front fender
Fuel hose
2
Fuel tank
Q’ty
1
Remarks
Remove the parts in the order below.
Refer to “SEAT AND FRONT PANEL”.
Refer to “FRONT FENDER”.
NOTE:
Before disconnecting the fuel hose, turn
the fuel cock to “OFF”.
1
For installation, reverse the removal
procedure.
– 15 –
SPEED LIMITER ADJUSTMENT
CHK
ADJ
ENGINE
SPEED LIMITER ADJUSTMENT
The speed limiter keeps the carburetor throttle
from becoming fully-opened even when the
throttle lever is applied to the maximum position. Screwing in the adjuster stops the engine
speed from increasing.
1.Check:
● Speed limiter length a
Out of specification → Adjust.
a
Speed limiter length:
Less than 20 mm (0.8 in)
2.Adjust:
● Speed limiter length
***********************************************
Speed limiter length adjustment steps:
● Loosen the locknut 1.
● Turn the adjuster 2 in or out until the specified speed limiter length is obtained.
1
2
Turning in
Speed limiter length is
decreased.
Turning out
Speed limiter length is
increased.
● Tighten
the locknut.
WARNING
●
●
Particularly for a beginner rider, the
speed limiter should be screwed in completely. Screw it out little by little as their
riding technique improves. Never remove
the speed limiter for a beginning rider.
For proper throttle lever operation do not
turn out the adjuster more than 20 mm
(0.8 in). Also, always adjust the throttle
lever free play to 3 ~ 5 mm (0.12 ~ 0.20 in).
***********************************************
– 16 –
SPEED LIMITER ADJUSTMENT/
AIR FILTER CLEANING
●
1
CHK
ADJ
Air intake restrictor plate removal
Refer to “AIR FILTER CLEANING”.
NOTE:
To obtain full engine performance capability,
removing the air intake restrictor plate 1 is
required. Since removal of this plate will result
in a significant increase in power, turn the
speed limiter completely back in again.
AIR FILTER CLEANING
NOTE:
There is check hose 1 at the bottom of the air
filter case. If dust and/or water collects in this
hose, clean the air filter element and air filter
case.
1
1.Remove:
● Front panel
Refer to “SEAT, FENDERS AND FUEL
TANK”.
2.Remove:
● Air filter cover 1
1
4
3
3.Remove:
● Rubber band 2
4.Pull out the air filter element assembly.
5.Remove:
● Guide
● Air filter element 3
● Air intake restrictor plate 4
2
CAUTION:
The engine should never be run without the
air filter element; excessive piston and/or
cylinder wear may result.
– 17 –
AIR FILTER CLEANING
CHK
ADJ
6.Check:
● Air filter element
Damage → Replace.
7.Clean:
Air filter element
●
***********************************************
Cleaning steps:
● Wash the element gently, but thoroughly in
solvent.
WARNING
Never use low flash point solvents such as
gasoline to clean the air filter element.
Such solvent may lead to a fire or explosion.
● Squeeze
the excess solvent out of the element and let dry.
CAUTION:
Do not twist the filter element when
squeezing the filter element.
● Apply
the engine oil.
out the excess oil.
● Squeeze
NOTE:
The element should be wet but not dripping.
***********************************************
8.Install:
● Air filter element
NOTE:
Make sure its sealing surface matches the
sealing surface of the case so there is no air
leak.
– 18 –
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