Yamaha VK10W Manual

SUPPLEMENTARY SERVICE MANUAL
VK10W
LIT-12618-02-57 8GS-28197-10
PRINTED IN U.S.A.
2006.07 CR
(E)
YAMAHA MOTOR CO., LTD.
Cover_SMB.fm Page 1 Thursday, June 29, 2006 2:03 PM

FOREWORD
This Supplementary Service Manual has been prepared to introduce new service and new data for
the VK10W. For complete information, on service procedures, it is necessary to use this Supple-
mentary Service Manual together with following manual:
RS90K, RS90RK, RSG90K, RS90MK, RST90K, RST90TFK SERVICE MANUAL:
8FJ-28197-10 (981096) (LIT-12618-02-38)
VK10L SUPPLEMENTARY SERVICE MANUAL:
8FN-28197-10 (LIT-12618-02-42)
VK10W
SUPPLEMENTARY SERVICE MANUAL
©2006 by Yamaha Motor
Corporation, U.S.A.
1st Edition, July 2006
All rights reserved. Any reprinting or
unauthorized use without the written
permission of Yamaha Motor Corporation,
U.S.A. is expressly prohibited.
Printed in U.S.A.
P/N.LIT-12618-02-57

NOTICE
This manual was written by the Yamaha Motor Company primarily for use by Yamaha dealers and
their qualified mechanics. It is not possible to put an entire mechanic’s education into one manual,
so it is assumed that persons using this book to perform maintenance and repairs on Yamaha
snowmobiles have a basic understanding of the mechanical concepts and procedures inherent in
snowmobile repair. Without such knowledge, attempted repairs or service to this model may render
it unfit and/or unsafe to use.
This model has been designed and manufactured to perform within certain specifications in regard
to performance and emissions. Proper service with the correct tools is necessary to ensure that the
vehicle will operate as designed. If there is any question about a service procedure, it is imperative
that you contact a Yamaha dealer for any service information changes that apply to this model. This
policy is intended to provide the customer with the most satisfaction from his vehicle and to conform
to federal environmental quality objectives.
Yamaha Motor Company, Ltd. is continually striving to improve all models manufactured by
Yamaha. Modifications and significant changes in specifications or procedures will be forwarded to
all authorized Yamaha dealers and will, where applicable, appear in future editions of this manual.
HOW TO USE THIS MANUAL
Particularly important information is distinguished in this manual by the following notations:
The Safety Alert Symbol means ATTENTION! BE ALERT! YOUR SAFETY IS
INVOLVED!
Failure to follow WARNING instructions could result in severe injury or death to
the snowmobile operator, a bystander, or a person inspecting or repairing the
snowmobile.
A CAUTION indicates special precautions that must be taken to avoid damage
to the snowmobile.
A NOTE provides key information that can make procedures easier or clearer.
MANUAL FORMAT
All of the procedures in this manual are organized in a sequential, step-by-step format. The informa-
tion has been compiled to provide the mechanic with an easy to read, handy reference that contains
comprehensive explanations of all inspection, repair, assembly, and disassembly operations.
In this revised format, the condition of a faulty component will precede an arrow symbol and the
course of action required to correct the problem will follow the symbol, e.g.,
•Bearings
Pitting/damage →Replace.
EXPLODED DIAGRAM
Each chapter provides exploded diagrams before each disassembly section to facilitate correct dis-
assembly and assembly procedures.
WARNING
CAUTION:
NOTE:

ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols 1to 9are designed as thumb
tabs to indicate the chapter’s number and content.
1General information
2Periodic inspection and adjustment
3Chassis
4Power train
5Engine
6Cooling system
7Carburetion
8Electrical
9Specifications
Illustrated symbols 0to Fare used to identify the
specifications which appear.
0
Filling fluid
ALubricant
BTightening
CWear limit, clearance
DEngine speed
ESpecial tool
FΩ, V, A
Illustrated symbols Gto Oin the exploded diagram
indicate grade of lubricant and location of lubrica-
tion point.
GApply locking agent (LOCTITE®)
HApply Yamabond No.5®
IApply engine oil
JApply gear oil
KApply molybdenum disulfide oil
LApply wheel bearing grease
MApply low-temperature lithium-soap base grease
NApply molybdenum disulfide grease
OUse new one
12
34
56
78
9
0 AB
CDE
FGH
IJK
LMN
O
GEN
INFO
INSP
ADJ
CHAS
POWR
TR
ENG
COOL
CARB
–+
ELEC
SPEC
T
R
.
.
LT
5
EGM
BLS M
New

INDEX
GENERAL INFORMATION GEN
INFO 1
PERIODIC INSPECTION AND
ADJUSTMENT INSP
ADJ 2
CHASSIS CHAS 3
POWER TRAIN POWR
TR 4
ENGINE ENG 5
COOLING SYSTEM COOL 6
CARBURETION CARB 7
ELECTRICAL ELEC 8
SPECIFICATIONS SPEC 9
–+

GENERAL INFORMATION
SPECIAL TOOLS .................................................1
FOR ELECTRICAL SERVICE ........................1
PERIODIC INSPECTION AND
ADJUSTMENT
INTRODUCTION...................................................2
PERIODIC MAINTENANCE CHART FOR
THE EMISSION CONTROL SYSTEM..................2
GENERAL MAINTENANCE AND
LUBRICATION CHART........................................3
POWER TRAIN.....................................................5
DRIVE V-BELT ...............................................5
BRAKE PAD INSPECTION ............................7
AIR BLEEDING (HYDRAULIC BRAKE
SYSTEM) ........................................................7
DRIVE CHAIN.................................................8
TUNING ..............................................................11
CLUTCH .......................................................11
GEAR SELECTION ......................................12
HIGH ALTITUDE TUNING............................18
POWER TRAIN
SHIFT LEVER.....................................................19
INSTALLATION ............................................21
DRIVE CHAIN HOUSING ...................................22
REMOVAL ....................................................25
INSPECTION ................................................25
INSTALLATION ............................................27
SECONDARY SHAFT ........................................29
SECONDARY SHAFT AND DRIVE CHAIN
HOUSING INSTALLATION...........................29
BRAKE ...............................................................31
BRAKE PAD REPLACEMENT .....................32
BRAKE CALIPER DISASSEMBLY ...............36
BRAKE CALIPER INSTALLATION...............36
FRONT AXLE AND TRACK...............................37
INSTALLATION ............................................37
ENGINE
CAMSHAFTS..................................................... 38
INSTALLATION............................................ 38
CARBURETION
CARBURETORS ............................................... 43
THROTTLE POSITION SENSOR (T.P.S.)
INSPECTION AND ADJUSTMENT ............. 44
ELECTRICAL
SIGNAL SYSTEM .............................................. 46
CIRCUIT DIAGRAM..................................... 46
TROUBLESHOOTING ................................. 48
GEAR POSITION SWITCH.......................... 49
GEAR POSITION SWITCH RELAY............. 49
SPECIFICATIONS
GENERAL SPECIFICATIONS........................... 50
MAINTENANCE SPECIFICATIONS.................. 52
ENGINE ....................................................... 52
POWER TRAIN............................................ 57
CHASSIS ..................................................... 60
ELECTRICAL ............................................... 61
HIGH ALTITUDE SETTINGS....................... 64
TIGHTENING TORQUE..................................... 66
ENGINE ....................................................... 66
POWER TRAIN............................................ 68
CHASSIS ..................................................... 70
GENERAL TORQUE SPECIFICATIONS .......... 71
DEFINITION OF UNITS ..................................... 71
CABLE ROUTING ............................................. 72

1
GEN
INFO
SPECIAL TOOLS
GENERAL INFORMATION
SPECIAL TOOLS
Some special tools are necessary for a completely accurate tune-up and
assembly. Using the correct special tool will help prevent damage that can
be caused by the use of improper tools or improvised techniques.
NOTE:
•Be sure to use the correct part number when ordering the tool, since the
part number may differ according to country.
•For USA and Canada, use part number starting with “YB-”, “YM-”, “YU-”
or “YS-”, “ACC-”.
•For others, use part number starting with “90890-”.
FOR ELECTRICAL SERVICE
•Pocket tester
P/N: YU-03112-C
90890-03112
This instrument is necessary for checking the electrical components.
1

2
INSP
ADJ
PERIODIC INSPECTION AND ADJUSTMENT
INTRODUCTION
This chapter includes all information necessary to perform recommended inspections and adjustments. These
preventive maintenance procedures, if followed, will ensure more reliable machine operation and a longer ser-
vice life. In addition, the need for costly overhaul work will be greatly reduced. This information applies to
machines already in service as well as new machines that are being prepared for sale. All service technicians
should be familiar with this entire chapter.
PERIODIC MAINTENANCE CHART FOR THE EMISSION CONTROL SYSTEM
Item Remarks
Pre-opera-
tion check
(Daily)
Initial
1 month or
800 km
(500 mi)
(40 hr)
Every
Seasonally
or 4,000 km
(2,500 mi)
(200 hr)
Spark plugs
Check condition.
Adjust gap and clean.
Replace if necessary.
Valve clearance Check clearance.
Adjust clearance when engine is cold. Every 40,000 km (25,000 mi)
Crankcase breather system Check breather hose for cracks or damage.
Replace if necessary.
Fuel filter Check condition.
Replace if necessary.
Fuel line Check fuel hose for cracks or damage.
Replace if necessary.
Idle speed Check and adjust engine idle speed.
Carburetors
Adjust synchronization of carburetors.
Adjust the jets. Whenever operating condition (elevation/
temperature) is changed.
Exhaust system Check for leakage.
Tighten or replace gasket if necessary.
INTRODUCTION/PERIODIC MAINTENANCE CHART FOR
THE EMISSION CONTROL SYSTEM

3
INSP
ADJ
GENERAL MAINTENANCE AND LUBRICATION CHART
GENERAL MAINTENANCE AND LUBRICATION CHART
Item Remarks
Pre-opera-
tion check
(Daily)
Initial
1 month or
800 km
(500 mi)
(40 hr)
Every
Seasonally
or 4,000 km
(2,500 mi)
(200 hr)
Engine oil Check oil level.
Replace.
Engine oil filter cartridge Replace.
Every
20,000 km
(12,000 mi)
Fuel Check fuel level.
Engine coolant Check coolant level.
Air bleed the cooling system if necessary.
Louvers Check condition.
Remove snow if necessary.
Throttle lever (carburetor
side) Check throttle lever operation.
Throttle lever (handlebar
side)
Check operation.
Repair if necessary.
Throttle override system
(T.O.R.S.)
Check operation.
Repair if necessary.
Engine stop switch Check operation.
Repair if necessary.
Drive guard Check for cracks, bends or damage.
Replace if necessary.
V-belt Check for wear and damage.
Replace if necessary.
Drive track and idler wheels Check deflection, and for wear and damage.
Adjust/replace if necessary.
Slide runners Check for wear and damage.
Replace if necessary.
Brake and parking brake
Check operation and fluid leakage.
Adjust free play and/or replace pads if necessary.
Replace brake fluid. See NOTE on page 4.
Disc brake installation Check for slight free play.
Lubricate shaft with specified grease as required.
Every
1,600 km
(1,000 mi)
Drive chain oil Check oil level.
Replace.
Drive chain Check deflection.
Adjust if necessary.
Initial at 500 km (300 mi) and every 800 km
(500 mi) thereafter.
Skis and ski runners Check for wear and damage.
Replace if necessary.
Steering system Check operation.
Adjust toe-out if necessary.
Strap Check for damage.
Replace if necessary.
Lights Check operation.
Replace bulbs if necessary.
Battery Check condition.
Charge if necessary.
Primary and secondary
clutches
Check engagement and shift speed.
Adjust if necessary. Whenever operating elevation is changed.
Inspect sheaves for wear/damage.
Inspect weights/rollers and bushings for wear-for pri-
mary.
Inspect ramp shoes/bushings for wear-for secondary.
Replace if necessary.
Lubricate with specified grease.
2

4
INSP
ADJ
GENERAL MAINTENANCE AND LUBRICATION CHART
NOTE:
Brake system:
•After disassembling the master cylinder or caliper cylinder, always change the brake fluid. Regularly check
the brake fluid level and add fluid if necessary.
•Replace the oil seals of the master cylinder and caliper cylinder every two years.
•Replace the brake hose every four years, or if cracked or damaged.
Steering column bearing Lubricate with specified grease.
Ski and front suspension Lubricate with specified grease.
Suspension component Lubricate with specified grease.
Parking brake cable end and
lever end/throttle cable end
Lubricate with specified grease.
Check cable damage.
Replace if necessary.
Shroud latches Make sure that the shroud latches are hooked.
Fittings and fasteners Check tightness.
Repair if necessary.
Tool kit and recommended
equipment Check for proper placement.
Item Remarks
Pre-opera-
tion check
(Daily)
Initial
1 month or
800 km
(500 mi)
(40 hr)
Every
Seasonally
or 4,000 km
(2,500 mi)
(200 hr)

5
INSP
ADJ
DRIVE V-BELT
POWER TRAIN
DRIVE V-BELT
WARNING
When installing the new V-belt, make sure that
it is positioned from 1.5 mm (0.06 in) above
the edge of the secondary sheave to –0.5 mm
(–0.02 in) below the edge a.
If the V-belt is not positioned correctly, the
clutch engagement speed will be changed. The
machine may move unexpectedly when the
engine is started.
Adjust the V-belt position by removing or add-
ing a spacer 1on each adjusting bolt 2.
CAUTION:
As the V-belt wears, adjustment may be neces-
sary. To ensure proper clutch performance, the
V-belt position should be adjusted by adding a
spacer on each adjusting bolt when the V-belt
position reaches 1.5 mm (0.06 in) below the
edge.
New belt width:
34.1 mm (1.34 in)
Belt wear limit width:
32.1 mm (1.26 in)
1. Measure:
•V-belt position a
NOTE:
Install the new V-belt onto the secondary sheave
only. Do not force the V-belt between the sheaves;
the sliding and fixed sheaves must touch each
other.
Standard V-belt height:
–0.5 ~ 1.5 mm (–0.02 ~ 0.06 in)

6
INSP
ADJ
DRIVE V-BELT
2. Adjust the position of the V-belt by removing or
adding a spacer 1on each adjusting bolt 2.
3. Tighten:
•Adjusting bolt 2
V-belt position Adjustment
More than 1.5 mm
(0.06 in) above the
edge
Remove a spacer
From 1.5 mm (0.06 in)
above the edge to
–0.5 mm (–0.02 in)
below the edge
Not necessary
(It is correct.)
More than –0.5 mm
(–0.02 in) below the
edge
Add spacer
Part number Thickness
90201-061H1 0.5 mm (0.02 in)
90201-06037 1.0 mm (0.04 in)
T
R
.
.
Adjusting bolt:
10 Nm (1.0 m ·kg, 7.2 ft ·lb)
4. Inspect:
•Drive V-belt
Cracks/damage/wear →Replace.
Oil or grease on the V-belt →Check the pri-
mary and secondary sheaves.
5. Inspect:
•Primary sheave
•Secondary sheave
Oil or grease on the primary and secondary
sheaves →Use a rag soaked in lacquer thin-
ner or solvent to remove the oil or grease.
Check the primary and secondary sheaves.

7
INSP
ADJ
DRIVE V-BELT/BRAKE PAD INSPECTION/
AIR BLEEDING (HYDRAULIC BRAKE SYSTEM)
6. Measure:
•Drive V-belt circumference a
Out of specification →Replace.
V-belt circumference:
1,132 ~ 1,138 mm (44.6 ~ 44.8 in)
BRAKE PAD INSPECTION
1. Apply the brake lever.
2. Inspect:
•Brake pad wear a
Wear indicator 1nearly contacts the brake
disc →Replace as a set.
Wear limit:
4.7 mm (0.19 in)
1
aa
AIR BLEEDING (HYDRAULIC BRAKE
SYSTEM)
WARNING
Bleed the brake system in the following cases:
•The system has been disassembled.
•A brake hose is loosened or removed.
•The brake fluid has been very low.
•Brake operation is faulty.
If the brake system is not properly bled a loss of
braking performance may occur.
1. Bleed:
•Brake system
Air bleeding steps:
a. Fill the brake master cylinder reservoir with the
proper brake fluid.
b. Install the diaphragm. Be careful not to spill any
fluid or allow the brake master cylinder reservoir
to overflow.
c. Connect clear plastic hoses 1tightly to the
brake caliper bleed screws 2.
d. Place the other ends of the hoses in a con-
tainer.
e. Slowly apply the brake lever several times.
f. Pull the lever in, then hold the lever in position.
g. Loosen the bleed screws and allow the brake
lever to travel towards its limit.
h. Tighten the bleed screws when the brake lever
limit has been reached, then release the lever.
1
1
2
2

8
INSP
ADJ
AIR BLEEDING (HYDRAULIC BRAKE SYSTEM)/
DRIVE CHAIN
i. Repeat steps (e) to (h) until all of the air bubbles
have disappeared from the fluid.
j. Tighten the bleed screws.
NOTE:
If bleeding is difficult, it may be necessary to let the
brake fluid settle for a few hours.
Repeat the bleeding procedure when the tiny bub-
bles in the system have disappeared.
k. Add brake fluid to the proper level.
WARNING
After bleeding the brake system, check the
brake operation.
T
R
.
.
Bleed screw:
6 Nm (0.6 m ·kg, 4.3 ft ·lb)
DRIVE CHAIN
Oil level inspection
WARNING
The engine and muffler will be very hot after the
engine has run. Avoid touching a hot engine
and muffler while they are still hot with any part
of your body or clothing during inspection or
repair.
1. Place the machine on a level surface.
2. Check:
•Oil level

9
INSP
ADJ
DRIVE CHAIN
Checking steps:
•Remove the rubber cap 1.
•Check the oil level through the check window 2
located on the drive chain housing.
•If the oil is below the minimum level mark a,
remove the dipstick 3and add sufficient oil to
the maximum level mark b.
CAUTION:
Make sure that no foreign material enters the
drive chain housing.
Recommended oil:
Gear oil “GL-3”
75W or 80W
1
2
b
a
3
•Reinstall the dipstick 3.
NOTE:
Align the notch cof the dipstick handle with the
projection dof the drive chain housing.
•Install the rubber cap.

10
INSP
ADJ
DRIVE CHAIN
Oil replacement
Oil replacement steps:
•Place the oil pan under the drain hole.
•Remove the oil drain bolt (along with the gas-
ket) 1and drain the oil.
CAUTION:
Be sure to remove any oil from the heat protec-
tor.
•Install the new gasket and oil drain bolt 1.
T
R
.
.
Oil drain bolt:
16 Nm (1.6 m ·kg, 11 ft ·lb)
Recommended oil:
Gear oil “GL-3”
75W or 80W
Oil capacity:
0.35 L (0.31 Imp qt, 0.37 US qt)
1
Chain slack adjustment
1. Adjust:
•Drive chain slack
Adjustment steps:
•Loosen the locknut 1.
•Turn the adjusting bolt 2clockwise until it is fin-
ger tight, and then loosen it 1/4 turn.
•Hold the adjusting bolt 2in place while tighten-
ing the chain adjusting locknut 1.
T
R
.
.
Drive chain adjusting locknut:
25 Nm (2.5 m ·kg, 18 ft ·lb)

11
INSP
ADJ
TUNING
CLUTCH
High altitude
Specifications
LBlue PPink
W White Y Yellow
ÈElevation ~ 800 m
(~ 2,500 ft)
600 ~ 1,400 m
(2,000 ~ 4,500 ft)
1,200 ~ 2,000 m
(4,000 ~ 6,500 ft)
1,800 ~ 2,600 m
(6,000 ~ 8,500 ft)
2,400 ~ 3,000 m
(8,000 ~ 10,000 ft)
ÉEngine idle speed 1,400 ± 100 r/min ←←←←
ÊEngagement r/min Approx. 2,400 r/min ←Approx. 2,500 r/min ←Approx. 2,600 r/min
ËShift r/min Approx. 8,500 r/min ←←←←
ÌMain jet
,Refer to “HIGH ALTITUDE SETTINGS” in “MAINTENANCE SPECIFICATIONS”. ÍPilot jet
ÎPilot screw
ÏSecondary reduc-
tion ratio (number
of links)
20/39 (68 L) ←19/39 (68 L) ←←
ÐPrimary sheave
spring 90501-550A2 ←←←
90501-580A1
ÑColor W-L-W ←←←
L-Y-L
ÒFree length 82.3 mm (3.24 in) ←←←
81.4 mm (3.20 in)
ÓPreload 196 N (20 kg, 44 lb) ←←←←
ÔSpring rate
22.1 N/mm
(2.25 kg/mm,
126 lb/in)
←←←
24.5 N/mm
(2.5 kg/mm,
140 lb/in)
ÕWire diameter 5.5 mm (0.217 in) ←←←
5.8 mm (0.228 in)
ÖOutside diameter 59.5 mm (2.34 in) ←←←←
×Weight (ID) 8FN-17605-00
(8FN00) ←←←←
ØWeight rivet
Steel 17.2 (OUT) Steel 17.2 with hole
(OUT)
Steel 13.3 with hole
(OUT)
Aluminum 13.3 with
hole (OUT) None (OUT)
Steel 17.2 with hole
(IN)
Steel 17.2 with hole
(IN)
Steel 13.3 with hole
(IN)
Aluminum 13.3 with
hole (IN) None (IN)
ÙWeight bushing VESPEL TP-8549 ←←←←
ÚRoller outer dia. 15.6 mm (0.61 in) ←←←←
ÛRoller bushing VESPEL TP-8549 ←←←←
ÜPri. clutch shim None ←←←←
ÝSecondary sheave
spring 90508-60012 ←←←←
ÞColor P ←←←←
ßFree length 75 mm (2.95 in) ←←←←
ÀPreload rate 60° (3-3)
1,211 kg · mm/rad ←←←←
ÁWire diameter 6.0 mm (0.236 in) ←←←←
+Outside diameter 69.5 mm (2.74 in) ←←←←
,Sec. torque cam
angle 39° ←←←←
-Sec. clutch shim 1.0 mm (0.04 in) ←←←←
CLUTCH

12
INSP
ADJ
CLUTCH/GEAR SELECTION
The clutch may require tuning depending upon
where the machine will be operated and the desired
handling characteristics. The clutch can be tuned
by changing the engagement and shifting speeds.
Clutch engagement speed is defined as the engine
speed at which the machine first begins to move
from a complete stop.
Clutch shifting speed is defined as the engine
speed reached when the machine has travelled
800 m (2,500 ft) after being started at full-throttle
from a dead stop.
Normally, when a machine reaches shifting speed,
the vehicle speed increases but the engine speed
remains nearly constant. Under unfavorable condi-
tions (wet snow, icy snow, hills, or rough terrain),
however, engine speed may decrease after the
shifting speed has been reached.
ÈEngine speed
ÉGood condition
ÊClutch shifting speed
ËClutch engagement speed
ÌStarting position
ÍDistance travelled 800 m (2,500 ft)
GEAR SELECTION
The reduction ratio of the driven gear to the drive
gear must be set according to the snow conditions.
If there are many rough surfaces or unfavorable
snow conditions, the drive/driven gear ratio should
be increased. If the surfaces are fairly smooth or
better snow conditions exist, decrease the ratio.
Gear ratio chart
The drive and driven gears and the chains shown in
the gear ratio chart are available as options. The
figures containing a decimal point represent the
drive/driven gear ratios, while the bottom numbers
designate the number of links in the chain.

13
INSP
ADJ
GEAR SELECTION
1Chain and sprocket part number
2Gear ratio
3Secondary sheave spring
ÈParts name ÉTeeth & links ÊParts no. ËStandard
ÌDrive sprocket
19 teeth 8FA-17682-90
20 teeth 8FA-17682-00
21 teeth 8FA-17682-10
22 teeth 8FA-17682-20
23 teeth 8FA-17682-30
24 teeth 8FA-17682-40
ÍDriven sprocket
38 teeth 8FB-47587-80
39 teeth 8FB-47587-90 √
40 teeth 8FB-47587-00
ÎChain 68 links 94890-09068 √
70 links 94890-09070
ÈDrive gear 19 teeth 20 teeth 21 teeth 22 teeth 23 teeth 24 teeth
ÉDriven gear
38 teeth 1.90
68 links
1.81
68 links
1.73
68 links
1.65
70 links
1.58
70 links
39 teeth 2.05
68 links
1.95
68 links
1.86
68 links
1.77
70 links
1.70
70 links
1.63
70 links
40 teeth 2.11
68 links
2.00
68 links
1.91
70 links
1.82
70 links
1.74
70 links
1.67
70 links
ÈPart No.
ÉSpring rate
N ·mm/rad
(kg ·mm/rad)
ÊPreload
N/mm (kg/mm)
(lb/in)
ËColor ÌWire gauge
mm (in) ÍNo. of coils ÎFree length mm (in)
ÏOutside
diameter
mm (in)
ÐStandard
90508-500B1 6003 (613) 6.2 (0.63), 35.28 Brown 5.0 (0.196) 5.19 75 (2.95) 69.5 (2.736)
90508-536A9 7147 (729) 7.3 (0.74), 41.44 Red 5.3 (0.209) 5.53 75 (2.95) 69.5 (2.736)
90508-556A2 8314 (848) 8.5 (0.87), 48.72 Green 5.5 (0.217) 5.53 75 (2.95) 69.5 (2.736)
90508-556A7 9460 (965) 10.2 (1.04), 58.24 Silver 5.5 (0.217) 4.86 75 (2.95) 69.5 (2.736)
90508-60012 11876 (1211) 12.3 (1.26), 70.56 Pink 6.0 (0.236) 5.53 75 (2.95) 69.5 (2.736) √
90508-60007 12654 (1290) 13.5 (1.37) 76.72 White 6.0 (0.236) 5.19 75 (2.95) 69.5 (2.736)

14
INSP
ADJ
GEAR SELECTION
4Secondary spring twist angle
5Torque cam (secondary spring seat)
ÈSeat 0369
ÉSheave
110°40°70°100°
220°50°80°110°
330°60°90°120°
ÉEffects ÊPart no. ËCam angle ÌIdentification mark ÍStandard
ÎQuicker upshifting dur-
ing acceleration
ÏQuicker backshifting
under load
8FA-17604-00 51-43°8BVFA
8BV-17604-71 47°8BV71
8BV-17604-51 45°8BV51
8BV-17604-31 43°8BV31
8BV-17604-11 41°8BV11
8BV-17604-91 39°8BV91 √