Yamaha MOTO-4 1987 User manual

1987
ATV / VTT
OWNER'S MANUAL / MANUEL DU PROPRIÉTAIRE
Model : YFM100T
2HX281997000 *2HX281997000*

IDENTIFICATION NUMBERS RECORD Your key identification number is stamped
on your key as shown in the following
1. KEY NUMBER: illustration. Record this number in the space
provided for reference if you need a new key.
2. FRAME AND ENGINENUMBER:
Key num
Record yourvehicleand enginenumbersin
the spaces provided to assistyou in ordering
spare parts from your Yamaha dealer or for
reference in case your vehicle is stolen. (See
page 3-2)

iNTRODUCTiON
Congratulations on your purchase of the NOTE:
Yamaha YFM100T. This model isthe result of Some data in this manual may become
Yamaha's vast experience in the production outdated due to future improvement on this
of fine sporting, touring, and pacessetting model.If you have any questions about this
racing machines. It represents the high degree manual or your machine, please consult a
of craftsmanship and reliability that have Yamaha dealer.
made Yamaha a leader in these fields.
This manual will give you an understanding TECHNICAL PUBLICATIONS
of the operation, inspection, and basic SERVICE DIVISION
maintenance of this motorcycle. If you have MOTORCYCLE OPERATION
any questions about the operation or YAMAHA MOTOR CO.,LTD
maintenance of your machine, please consult
aYamaha dealer.

YFM100T
OWNER'S MANUAL
©1986 by Yamaha Motor Co.,Ltd.
1st Edition,September 1986
All rights reserved. Any reprinting or
unauhorized usewithout the written
permission of Yamaha Motor Co.,Ltd.
isexpressly prohibited.
Printed in Japan

PLEASE READ THIS MANUAL CARE- A WARNING indicates special procedures
FULLY AND COMPLETELY BEFORE that must be followed to avoid injury to a
OPERATING THIS MACHINE.machine operator or person inspecting or
repairing the machine.
Particularly important information is distin-
NOTE: __ __
guished in this manual by the following
notations: This manual should beconsidered apermanent
part of this motorcycle and should remain
NOTE: with it even if the machineis subsequently
sold.
A NOTE provides key information to make
procedures easier or clearer.
A CAUTION indicates special procedures that
must be followed to avoid damage to the
machine.

IMPORTANTNOTICE
THIS VEHICLE IS DESIGNED AND MANUFACTURED FOROFF-ROAD
USE ONLY. IT IS ILLEGAL TO OPERATE THIS VEHICLE ON ANY
PUBLIC STREET, ROAD OR HIGHWAY.SUCH USE IS PROHIBITED
BY LAW.
THIS VEHICLE COMPLIES WITH ALMOST ALL STATE OFF-HIGHWAY
NOISE LEVEL AND SPARK ARRESTER LAWS AND REGULATIONS.
PLEASE CHECK YOUR LOCAL RIDING LAWS AND REGULATIONS
BEFORE OPERATING THIS VEHICLE.

CONTENTS
SAFETY INFORMATION ............ 1-1 Speed limiter ..................... 4-3
Ride with care and good judgement ... 1-1 Front brake lever .................. 4-4
Be careful where you ride ........... 1-6 Rear brake lever .................. 4-4
Gasoline ........................ 1-7 Parking brake button ............... 4-5
Modifications .................... 1-8 Rear brake pedal .................. 4-5
Change pedal ..................... 4-6
LOADING PRECAUTIONS ........... 2-1 Fuel tank cap .................... 4-6
Fuel cock ....................... 4-7
DESCRIPTION AND MACHINE Choke lever ...................... 4-7
IDENTIFICATION .................. 3-1 Seat ............................ 4-8
Vehicle identification number ........ 3-2 Storage box ...................... 4-9
Engine serial number ............... 3-2
PRE-OPERATION CHECKS ........... 5-1
CONTROL FUNCTIONS ............. 4-1 Brake ........................... 5-2
Main switch ...................... 4-1 Fuel ............................ 5-2
Indicator lights ................... 4-1 Engine oil ....................... 5-3
Handlebar switches ................ 4-2 Throttle lever .................... 5-3
Throttle lever .................... 4-3

Fittings/Fasteners ................. 5-3 Riding downhill .................... 7-9
Battery ......................... 5-3 Crossing a slope .................... 7-9
Switches ........................ 5-3 Crossing through shallow water ....... 7-11
Tires ........................... 5-4 Riding over rough terrain ........... 7-12
How to measure tire pressure ........ 5-4 Sliding and skidding ............... 7-13
Tire wear limit .................... 5-5
PERIODIC MAINTENANCE AND
OPERATION ...................... 6-1 ADJUSTMENT ...................... 8-1
Starting a cold engine .............. 6-1 Owner's manual and tool kit .......... 8-1
Starting a warm engine ............. 6-3 Periodic maintenance/Lubrication ...... 8-3
Warming up ...................... 6-3 Torque specifications ............... 8-4
Engine break-in ................... 6-3 Engine oil ........................ 8-5
Shifting and acceleration ............ 6-4 Spark plug ........................ 8-6
Gear shifting ..................... 6-5 Ignition timing .................... 8-8
Parking ......................... 6-5 Air filter cleaning .................. 8-8
Hard starting ..................... 6-7 Carburetor adjustment ............. 8-10
Idle speed adjustment .............. 8-10
RIDING YOUR MOTO-4 ............. 7-1 Cam chain adjustment .............. 8-11
Getting to know your moto-4 ........ 7-2 Valve clearance adjustment .......... 8-11
Learning to ride your moto-4 ........ 7-3 Throttle lever adjustment ........... 8-12
Turning your moto-4 ............... 7-5 Brake pedal and brake
Climbing uphill ................... 7-6 lever adjustment .................. 8-12

Front brake adjustment ............ 8-14 Wl RING DIAGRAM
Brake lining inspection ............ 8-15
Clutch adjustment ................ 8-16
Cable inspection and lubrication ..... 8-16
Lubrication of levers, pedals, etc ..... 8-17
Knuckle shaft ................... 8-17
Wheel removal ................... 8-17
Wheel installation ................ 8-17
Tire tread ...................... 8-18
Battery ........................ 8-18
Replenishing the battery fluid ....... 8-19
Fuse replacement ................ 8-20
Replacing the headlight bulb ........ 8-21
Headlight beam adjustment ......... 8-22
Troubleshooting ................. 8-23
Troubleshooting chart ............. 8-24
CLEANING AND STORAGE ......... 9-1
A.Cleaning .................... 9-1
B. Storage ..................... 9-2
SPECIFICATIONS ................. 10-1

SAFETY INFORMATION
When you ride your machine, you must know
and use the following for your safety:
A responsible adult should instruct and super-
viseoperation of this machine by young
riders.
Not recommended for children under 14
years of age.
Ride with care and good judgement:
1. Speed limiter
For beginning riders, this model is equip-
ped with a speed limiter in the throttle
lever housing. The speed limiter limits
the topspeed of the machine. Turning
the screw in decreases the top speed and
turnning it out increases the top speed.
(See page 4-3)
1-1

2. Riding your machine requires skills 3. This machine is designed to carry one
acquired through practice over a period person only.Do not carry a passenger.
of time.Take the time to learn the basic
techniques well before attempting more ONE PERSON
difficult maneuvers. ONLY t__,_ _
1-2

4. Wear protective clothing: 5.This machine is designed for off-road use
ALWAYS wear a helmet when riding only. Do not ride on pavement since
your machine. Goggles or other eye handling can be seriously affected. If
protection should also be worn. you must ride on paved surfaces, go
Wear boots, gloves, long pants and other slowly and do not make sudden turns or
protective clothing, stops. Riding on pavement will also
shortentire life.
Protective
clothing _Goggles
Helmet
Gloves
Boots
1-3

6.Do not operate after consuming alcohol 7.Always perform the Pre-Operation
or drugs.Check listed on page 5-1 before riding
for safety and proper care of the
machine.
1-4

8. Always keep your feet on the footrests 10. The exhaust system on the machine is
during operation. Otherwise your feet very hot during and following operation.
maycontactthe rear wheels. To prevent burns, avoid touching the
exhaust system. Park the machine in a
place where pedestrians or children are
_-_' _ _' not likely to touch it.
9. Avoid wheelies and jumping.You may
losecontrol of the machineor overturn.
1-5

Becareful where you ride: 2. When riding in an area where you might
1. Ride cautiously in unfamiliar areas. You not easily be seen, such as desert terrain,
mayencounter hidden obstacles which mount a caution flag on the machine.
could cause an accident. DO NOT use the flag pole bracket as a
trailer hitch.
1-6

3.Do not ride in areasposted "no trespass- • Take care not to spill gasoline on
ing".Do not ride on private property the engine or exhaust pipe/muffler
without getting permission,when refueling.
• Never refuel while smoking or in the
vicinity of an open flame.
2. Ifyou should swallow some gasoline or
inhale a lot of gasoline vapor, or allow
some gasolineto get into youreye(s), see
your doctor immediately.
_ _t/_--_.__Ifanygasoline spills on yourskin or
i--= __/,.1_____L__ clothing,immediately wash it with soap
and water, and change your clothes.
/3. Neverstartthe engineorlet it run forany
length of time in a closed area. The ex-
haust fumes are poisonous and may
cause loss of consciousness and death
within a short time. Always operate your
Gasoline: machine in an area with adequate
1. GASOLINE IS HIGHLY FLAMMABLE: ventilation.
•Always turn off the engine when
refueling.
1-7

4. When transporting the machine in Modifications:
another vehicle, be sure it is kept upright 1. This machine is designed to conform
and that the fuel cockis turned to the with laws and regulations regarding spark
"OFF"position. If the machine should arresters and noise level. Do not modify
lean over, gasoline mayleak out of the the exhaust system.
carburetor or fueltank. 2.Modificationsto thismachine may
reduce safetyand reliability, and may
make the machine illegal for use.
1-8

LOADING PRECAUTIONS •The cargos on the carrier must not extend
beyond the carrier end.
Proper loading of your machine is important
for the handling, braking,and safety chara-
cteristics of the machine. Please read the
MAXIMUM LOADING LIMIT
following information before loading and
•Vehicle load limit: 95 kg (210 Ib)*
operating your machine. *Total weight of cargo, rider, and
• The total weight of the rider, accessories,
accessories.
and cargo must not exceed the maximum
•When using this machine under 16km/h
load limit.
(10 mi/h), this load limit can be in-
•When loading the machine with cargo creasedto 100 kg (220 Ib).
and/or the stability, performance and •Storage box: 2kg (4.4 Ib)
safe operating speed will be reduced.
(If so eqipped)
Accordingly, the machine must beused •Rearcarrier:10kg (22 Ib)
on level and flat terrain only and must
(If so equipped)
not exceed 16 km/h (10 mi/h).
(If so equipped)
•Make sure that the cargos are securely
attached to carrier.
•Make sure that the cargo on the rear car-
rier isplaced asfar forward aspossible.
2-1