Yamaha YFM125S Manual de usuario
YFM125S
3FA-AE2
SUPPLEMENTARY
SERVICE MANUAL
FOREWORD
This Supplementary Service Manual has been prepared to introduce new service and data for the
YFM125S. For complete service information procedures it is necessary to use this Supplementary
Service Manual together with the following manual.
YFA1W SERVICE MANUAL: 3FA-ME1
YFA1(P) 2002 SUPPLEMENTARY SERVICE MANUAL: 3FA-AE1
YFM125S
SUPPLEMENTARY
SERVICE MANUAL
©2004 by Yamaha Motor Co., Ltd.
First edition, January 2004
All rights reserved.
Any reproduction or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
EBS00002
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 sig-
nificant 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.
EBS00003
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!
Failure to follow WARNING instructions could result in severe injury or death
to the machine operator, a bystander or a person checking or repairing the
machine.
A CAUTION indicates special precautions that must be taken to avoid dam-
age to the machine.
A NOTE provides key information to make procedures easier or clearer.
WARNING
CAUTION:
NOTE:
EBS00004
HOW TO USE THIS MANUAL
MANUAL ORGANIZATION
This manual consists of chapters for the main categories of subjects. (See “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 accompa-
nied 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 4is provided for removal and disassembly jobs.
2. Numbers 5are 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 7accompanies 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 8are given in addition
to the exploded diagram and the job instruction chart.
EB003000
ILLUSTRATED SYMBOLS
Illustrated symbols 1to 8are printed on the
top right of each page and indicate the subject
of each chapter.
1General information
2Specifications
3Periodic checks and adjustments
4Engine
5Carburetion
6Chassis
7Electrical
8Troubleshooting
Illustrated symbols 9to Eare used to identify
the specifications appearing in the text.
9Filling fluid
0Lubricant
ASpecial tool
BTorque
CWear limit, clearance
DEngine speed
EΩ, V, A
Illustrated symbols Fto Lin the exploded
diagrams indicate the types of lubricants and
lubrication points.
FApply engine oil
GApply gear oil
HApply molybdenum disulfide oil
IApply wheel bearing grease
JApply lightweight lithium soap base grease
KApply molybdenum disulfide grease
LApply silicon grease
Illustrated symbols Mto Nin the exploded
diagrams indicate where to apply a locking
agent Mand when to install a new part N.
MApply the locking agent (LOCTITE®)
NReplace
12
34
56
78
90
AB
CD
E
FGH
I
MN
GEN
INFO SPEC
CHK
ADJ ENG
CARB CHAS
–+
ELEC TRBL
SHTG
T
R
.
.
EGM
BLS MS
JKL
LT
New
CONTENTS
SPECIFICATIONS ............................................................................................1
GENERAL SPECIFICATIONS ..................................................................1
MAINTENANCE SPECIFICATIONS .........................................................2
ENGINE ................................................................................................2
CHASSIS ..............................................................................................2
ELECTRICAL ........................................................................................3
CABLE ROUTING .....................................................................................4
PERIODIC CHECKS AND ADJUSTMENTS ..................................................17
SEAT, CARRIERS AND FENDERS ........................................................17
SEAT, FRONT CARRIER, FRONT BUMPER AND CENTER COVER ....17
FRONT GRILL ASSEMBLY AND FRONT FENDER ..........................19
REAR CARRIER AND REAR FENDER ..............................................20
ELECTRICAL ..........................................................................................22
ADJUSTING THE HEADLIGHT BEAMS ............................................22
REPLACING A HEADLIGHT BULB ....................................................22
ELECTRICAL .................................................................................................24
IGNITION SYSTEM .................................................................................24
CIRCUIT DIAGRAM ............................................................................24
CHARGING SYSTEM .............................................................................25
CIRCUIT DIAGRAM ............................................................................25
LIGHTING SYSTEM ................................................................................26
CIRCUIT DIAGRAM ............................................................................26
TROUBLESHOOTING ........................................................................27
SIGNAL SYSTEM ...................................................................................29
CIRCUIT DIAGRAM ............................................................................29
CHECKING THE SIGNALING SYSTEM .............................................30
YFM125S WIRING DIAGRAM
–1 –
SPEC
SPECIFICATIONS
GENERAL SPECIFICATIONS
Model YFM125S
Model code number 1C51: (for Oceania)
1C53: (for CDN)
1C54: (for Europe)
Dimensions
Overall length 1,710 mm (67.3 in)
Overall width 990 mm (39.0 in)
Overall height 980 mm (38.6 in)
Seat height 705 mm (27.8 in)
Wheelbase 1,080 mm (42.5 in)
Minimum ground clearance 145 mm (5.7 in)
Basic weight
Wet (with oil and a full fuel tank) 152 kg (335 lb)
Dry (without oil and fuel) 144 kg (317 lb)
Maximum load (except vehicle) 100 kg (220 lb)
Fuel
Type Regular unleaded gasoline only (for CDN and
Europe)
Unleaded gasoline only (for Oceania)
Fuel tank capacity 7.6 L (1.67 Imp gal, 2.01 US gal)
Reserve amount 1.3 L (0.28 Imp gal, 0.34 US gal)
Spark plug
Type/manufacturer CR7HS/NGK
Spark plug gap 0.6 ~ 0.7 mm (0.024 ~ 0.028 in)
Electrical
Ignition system DC C.D.I.
Generator system A.C. magneto generator
Battery capacity 12V 12Ah
Battery type 12N12C-4A-2
Headlight type Bulb type
Headlight bulb type Krypton
Bulb wattage (quantity)
Headlight 12 V 30 W/30 W (2 pc.)
Tail/brake light 12 V 5 W/21 W (1 pc.)
Neutral indicator light 12 V 1.7 W (1 pc.)
Reverse indicator light 12 V 1.7 W (1 pc.)
GENERAL SPECIFICATIONS
–2 –
SPEC
MAINTENANCE SPECIFICATIONS
MAINTENANCE SPECIFICATIONS
ENGINE
CHASSIS
Tightening torques
Model YFM125S
Carburetor
I.D. mark 5VJ2 10
Main jet (M.J) # 77.5
Main air jet (M.A.J) ø1.3
Jet needle (J.N) 4HPY46-1
Needle jet (N.J) O-1M
Cutaway (C.A) 2.5
Pilot air jet (P.A.J) # 130
Pilot outlet (P.O) ø0.7
Pilot jet (P.J) # 12.5
Bypass 1 (B.P.1) 1.1
Pilot screw (P.S) 2 and 1/2 turns out (for Europe and Oceania)
Valve seat size (V.S) 1.8
Starter jet (G.S) # 45
Fuel level (F.L) 3.5 ~ 4.5 mm (0.14 ~ 0.18 in)
With special tool
Engine idling speed 1,650 ~ 1,750 r/min
Intake vacuum 26.7 kPa (200 mmHg, 7.88 inHg)
Part to be tightened Thread size Tightening torque Remarks
Nm m ·kg ft ·lb
Footrest board and footrest bracket M5 7 0.7 5.1
Footrest and footrest bracket M6 10 1.0 7.2
Front fender and frame M6 7 0.7 5.1
Front carrier and front grill M6 7 0.7 5.1
Fuel tank M6 10 1.0 7.2
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