Yamaha TZ125M1 Application guide

4JT-28199-16LIT-11626-13-42
OWNER’S SERVICE MANUAL
TZ125M1/(M)

TZ125M1/(M)
OWNER’S SERVICE MANUAL
©1999 by Yamaha Motor Corporation, U.S.A.
1st Edition, August 1999
All rights reserved. Any reprinting or
unauthorized use without the written
permission of Yamaha Motor Corporation
U.S.A. is expressly prohibited.
Printed in Japan
P/N. LIT-11626-13-42
EC010000

EC020000 INTRODUCTION
Congratulations on your purchase of a Yamaha
TZ series. This model is the culmination of
Yamaha’s vast experience in the production of
pacesetting racing machines. It represents the
highest grade of craftsmanship and reliability
that have made Yamaha a leader.
This manual explains operation, inspection,
basic maintenance and tuning of your
machine. If you have any questions about this
manual or your machine, please contact your
Yamaha dealer.
NOTE:
As improvements are made on this model,
some data in this manual may become outdat-
ed. If you have any questions, please consult
your Yamaha dealer.
W
PLEASE READ THIS MANUAL CAREFULLY
AND COMPLETELY BEFORE OPERATING
THIS MACHINE. DO NOT ATTEMPT TO
OPERATE THIS MACHINE UNTIL YOU
HAVE ATTAINED A SATISFACTORY
KNOWLEDGE OF ITS CONTROLS AND
OPERATING FEATURES AND UNTIL YOU
HAVE BEEN TRAINED IN SAFE AND PROP-
ER RIDING TECHNIQUES. REGULAR
INSPECTIONS AND CAREFUL MAINTE-
NANCE, ALONG WITH GOOD RIDING
SKILLS, WILL ENSURE THAT YOU SAFELY
ENJOY THE CAPABILITIES AND THE
RELIABILITY OF THIS MACHINE.

EC030010 WARRANTY INFORMATION
This model is sold AS IS, WITHOUT ANY WARRANTIES EXPRESSED OR IMPLIED REGARD-
LESS OF THE INTENDED USE.
THE PURCHASER OF THIS MACHINE, which is intended for competition purposes, IS RESPON-
SIBLE FOR ALL COSTS, SERVICE AND/OR REPAIR.

EC040001 IMPORTANT NOTICE
THIS MACHINE IS DESIGNED STRICTLY
FOR COMPETITION USE, ONLY ON A
CLOSED COURSE. It is illegal for this
machine to be operated on any public street,
road, or highway. Off-road use on public lands
may also be illegal. Please check local regula-
tions before riding.
1. THIS MACHINE IS TO BE OPERATED
BY AN EXPERIENCED RIDER ONLY.
Do not attempt to operate this
machine at maximum power until you
are totally familiar with its character-
istics.
2. THIS MACHINE IS DESIGNED TO BE
RIDDEN BY THE OPERATOR ONLY.
Do not carry passengers on this
machine.
3. ALWAYS WEAR PROTECTIVE APPAR-
EL.
When operating this machine, always
wear an approved helmet with gog-
gles or a face shield. Also wear heavy
boots, gloves, and protective cloth-
ing. Always wear proper fitting cloth-
ing that will not be caught in any of
the moving parts or controls of the
machine.
4. ALWAYS MAINTAIN YOUR MACHINE
IN PROPER WORKING ORDER.
For safety and reliability, the machine
must be properly maintained. Always
perform the pre-operation checks
indicated in this manual. Correcting a
mechanical problem before you ride
may prevent an accident.
5. GASOLINE IS HIGHLY FLAMMABLE.
Always turn off the engine while refu-
eling. Take care to not spill any gaso-
line on the engine or exhaust system.
Never refuel in the vicinity of an open
flame, or while smoking.
&SAFETY INFORMATION

6. GASOLINE CAN CAUSE INJURY.
If you should swallow some gasoline,
inhale excess gasoline vapors, or
allow any gasoline to get into your
eyes, contact a doctor immediately. If
any gasoline spills onto your skin or
clothing, immediately wash skin
areas with soap and water, and
change your clothes.
7. ONLY OPERATE THE MACHINE IN AN
AREA WITH ADEQUATE VENTILA-
TION.
Never start the engine or let it run for
any length of time in an enclosed
area. Exhaust fumes are poisonous.
These fumes contain carbon monox-
ide, which by itself is odorless and
colorless. Carbon monoxide is a dan-
gerous gas which can cause uncon-
sciousness or can be lethal.
8. PARK THE MACHINE CAREFULLY;
TURN OFF THE ENGINE.
Always turn off the engine if you are
going to leave the machine. Do not
park the machine on a slope or soft
ground as it may fall over.
9. PROPERLY SECURE THE MACHINE
BEFORE TRANSPORTING IT.
When transporting the machine in
another vehicle, always be sure it is
properly secured and in an upright
position and that the fuel cock is in
the “OFF” position. Otherwise, fuel
may leak out of the carburetor or fuel
tank.

EC050000 TO THE NEW OWNER
This manual will provide you with a good basic
understanding of features, operation, and
basic maintenance and inspection items of this
machine. Please read this manual carefully
and completely before operating your new
machine. If you have any questions regarding
the operation or maintenance of your machine,
please consult your Yamaha dealer.
NOTE:
This manual should be considered a perma-
nent part of this machine and should remain
with it even if the machine is subsequently
sold.
EC060000 NOTICE
Some data in this manual may become outdat-
ed due to improvements made to this model in
the future. If there is any question you have
regarding this manual or your machine, please
consult your Yamaha dealer.
Weights of machines without fuel
The minimum weights for road race
machines are:
for the class 125 cc . . . . . . . . . . .minimum
70 kg (154 lb)
for the class 250 cc . . . . . . . . . . .minimum
95 kg (209 lb)
for the class 500 cc . . . . . . . . . . .minimum
131 kg (289 lb)
In modifying your machine (e.g., for weight
reduction), take note of the above limits of
weight.
EC070011
F.I.M. MACHINE WEIGHTS:

EC080000 HOW TO USE
THIS MANUAL
EC081000
PARTICULARLY IMPORTANT INFOR-
MATION
!!
The Safety Alert Symbol means ATTENTION!
BECOME ALERT! YOUR SAFETY IS
INVOLVED!
W
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.
CCCAUTION:
A CAUTION indicates special precautions that
must be taken to avoid damage to the
machine.
NOTE:
A NOTE provides key information to make pro-
cedures easier or clearer.
EC082000
FINDING THE REQUIRED PAGE
1. This manual consists of seven chapters;
“General Information”, “Specifications”,
“Regular inspection and adjustments”,
“Engine”, “Chassis”, “Electrical” and
“Tuning”.
2. The table of contents is at the beginning of
the manual. Look over the general layout of
the book before finding then required chap-
ter and item.
Bend the book at its edge, as shown, to find
the required fore edge symbol mark and go
to a page for required item and description.

EC083000
MANUAL FORMAT
All of the procedures in this manual are organized in a sequential, step-by-step format. The infor-
mation has been complied to provide the mechanic with an easy to read, handy reference that con-
tains comprehensive explanations of all disassembly, repair, assembly, and inspection operations.
In this revised format, the condition of a faulty component will precede an arrow symbol and the
course of action required will follow the symbol, e.g.,
•Bearings
Pitting/Damage ≥Replace.
EC084002
HOW TO READ DESCRIPTIONS
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 1is provided for removal and disassembly jobs.
2. Numbers 2are given in the order of the jobs in the exploded diagram.Anumber 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
3. The meanings of the symbol marks are given on the next page.
4. Ajob instruction chart 4accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
5. Extent of removal 5is provided in the job instruction chart to save the trouble of an unneces-
sary removal job.
6. For jobs requiring more information, the step-by-step format supplements 6are given in addi-
tion to the exploded diagram and job instruction chart.
CLUTCH
4-25
ENG
EC4A8100
CLUTCH HOUSING AND PUSH LEVER AXLE
Extend of removal: 1Clutch housing removal 2Push lever axle removal
Extend of removal Order Part name Q’ty Remarks
CLUTCH HOUSING AND
PUSH LEVER AXLE
REMOVAL
1 Nut (clutch boss) 1
2 Lock washer 1 Use special tool.
3 Clutch boss 1 Refer to “REMOVAL POINTS”.
4 Spacer 2 1
5 O-ring (small) 1
6 Clutch housing 1
7 O-ring (large) 1
8 Bearing 1
9 Spacer 1 1
10 Ball 1
11 Push rod 1
12 Bolt (seat plate) 1
13 Seat plate 1
14 Push lever axle 1
T 50 Nm (5.0 mdkg, 36 ftdlb)
T 11 Nm (1.1 mdkg, 8.0 ftdlb)
2
1
CLUTCH
4-26
EC4A3000
REMOVAL POINTS
EC483211
Clutch boss
1. Remove:
•Nut 1
•Lock washer 2
•Clutch boss 3
NOTE:
Straighten the lock washer tab and use the
clutch holding tool 4, 5to hold the clutch
boss.
Clutch holding tool:
YM-91042 . . . . . . . . . . . . . . . .44
90890-04086 . . . . . . . . . . . . .55
B
AFor USA and CDN
BExcept for USA and CDN
EC4A4000
INSPECTION
EC484100
Clutch housing and boss
1. Inspect:
•Clutch housing 1
Cracks/Wear/Damage ≥Replace.
•Clutch boss 2
Scoring/Wear/Damage ≥Replace.
EC4A4100
Clutch housing
1. Check:
•Circumferential play
Free play exists ≥Replace.
•Gear teeth a
Wear/Damage ≥Replace.
•O-ring 1
Damage ≥Replace.
EC484400
Clutch spring
1. Measure:
•Clutch spring free length a
Out of specification ≥Replace springs as
a set.
Clutch spring free length:
Standard <Limit>
36.0 mm (1.417 in) 35.0 mm (1.378 in)
{
ENG
1
6
2
4
5
3

EC085002
ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols 1to 7are designed as
thumb tabs to indicate the chapter’s number
and content.
1General information
2Specifications
3Regular inspection and adjustments
4Engine
5Chassis
6Electrical
7Tuning
Illustrated symbols 8to ¢are used to identi-
fy the specifications appearing in the text.
8With engine mounted
9Special tool
0Filling fluid
¡Lubricant
™Tightening
£Specified value, Service limit
¢Resistance ( Ω), Voltage ( V ), Electric cur-
rent ( A )
Illustrated symbols ∞to ªin the exploded dia-
grams indicate grade of lubricant and location
of lubrication point.
∞Apply transmission oil
§Apply engine mixing oil
¶Apply molybdenum disulfide oil
•Apply lightweight lithium-soap base grease
ªApply molybdenum disulfide grease
Illustrated symbols ºto !in the exploded dia-
grams indicate where to apply a locking agent
and where to install new parts.
ºApply locking agent (LOCTITE®)
!Use new one
1
GEN
INFO
3
INSP
ADJ
5
CHAS
7
TUN
8
6
ELEC
4
ENG
2
SPEC
9
¡
£
∞
º!
•ª
¶§
¢
™
0