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2012 Yamaha VECTOR / LTX / RS VECTOR / LTX / RS VENTURE GT Snowmobile Service Repair Maintenance Overhaul Workshop Manual
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RS90GTZ/RS90LTGTZ/RST90GTZ
SERVICE MANUAL
© 2009 by Yamaha Motor
Corporation, U.S.A.
1st Edition, April 2009
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-12618-02-91

MAJOR SPECIFICATIONS
Model RS90GTZ RS90LTGTZ RST90GTZ
Model code 8JA1 8JB1 8HF3
Catalogue name RS Vector GT RS Vector L-TX GT RS Venture GT
Class Groomed Trail Trail Versatility Touring
Seating Capacity One Two
Engine type Liquid cooled 4-stroke, 12 valves
Cylinder arrangement/Displacement Backward-inclined parallel 3-cylinder/1,049cm
3
Fuel system type Electronic fuel injection
Track length 3,072 mm (121 in) 3,456 mm (136 in) 3,648 mm (144 in)
Front suspension Independent, double wishbone
Front shock absorber
40mm GYTR aluminum HPG
with reservoir dual-clicker
Rear suspension
Mono Shock II
RA
Mono Shock II
RA 136
Pro Comfort
CK 144
Rear shock
absorber
Front — 40mm aluminum HPG
Rear
46mm KYB
aluminum HPG
with remote adjust
40mm aluminum HPG
with reservoir
compression clicker
Ski type
Lightweight plastic
saddleless
middle keel
Electric start Standard
Reverse Standard

IMPORTANT
This manual was produced by the Yamaha Motor Company, Ltd. primarily for use by Yamaha deal-
ers and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one
manual. Therefore, anyone who uses this book to perform maintenance and repairs on Yamaha
snowmobiles should have a basic understanding of mechanics and the techniques to repair these
types of snowmobiles. Repair and maintenance work attempted by anyone without this knowledge
is likely to render the snowmobile unsafe and unfit for 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
snowmobile will operate as designed. If there is any question about a service procedure, it is imper-
ative 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 snowmobile and
to conform to federal environmental quality objectives.
Yamaha Motor Company, Ltd. is continually striving to improve all of its models. Modifications and
significant changes in specifications or procedures will be forwarded to all authorized Yamaha deal-
ers and will appear in future editions of this manual where applicable.
TIP
• This Service Manual contains information regarding periodic maintenance to the emission control
system. Please read this material carefully.
• Designs and specifications are subject to change without notice.
IMPORTANT MANUAL INFORMATION
Particularly important information is distinguished in this manual by the following notations.
This is the safety alert symbol. It is used to alert you to potential per-
sonal injury hazards. Obey all safety messages that follow this symbol
to avoid possible injury or death.
A WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
WARNING
A NOTICE indicates special precautions that must be taken to avoid
damage to the snowmobile or other property.
NOTICE
A TIP provides key information to make procedures easier or clearer. TIP

HOW TO USE THIS MANUAL
This manual is intended as a handy, easy-to-read reference book for the mechanic. Comprehensive
explanations of all installation, removal, disassembly, assembly, repair and check procedures are
laid out with the individual steps in sequential order.
• The manual is divided into chapters. An abbreviation and symbol in the upper right corner of
each page indicate the current chapter.
Refer to “SYMBOLS.”
• Each chapter is divided into sections. The current section title is shown at the top of each page,
except in Chapter 3 (“PERIODIC INSPECTION AND ADJUSTMENT”), where the sub-section
title(s) appears.
• Sub-section titles appear in smaller print than the section title.
•To help identify parts and clarify procedure steps, there are exploded diagrams at the start of
each removal and disassembly section.
• Numbers are given in the order of the jobs in the exploded diagram. A number indicates a disas-
sembly step.
• Symbols indicate parts to be lubricated or replaced.
Refer to “SYMBOLS”.
• A job instruction chart accompanies the exploded diagram, providing the order of jobs, names
of parts, notes in jobs, etc.
• Jobs requiring more information (such as special tools and technical data) are described
sequentially.

ILLUSTRATED SYMBOLS
(Refer to the illustration)
Illustrated symbols to are designed as
thumb tabs to indicate the chapter’s number
and content.
General information
Periodic inspection and adjustment
Chassis
Power train
Engine
Cooling system
Fuel injection system
Electrical
Specifications
Illustrated symbols to are used to iden-
tify the specifications which appear.
Filling fluid
Lubricant
Tightening torque
Wear limit, clearance
Engine speed
Special tool
Electrical data (Ω , V, A)
Illustrated symbols to in the exploded
diagram indicate grade of lubricant and loca-
tion of lubrication point.
Apply locking agent (LOCTITE
®
)
Apply Yamabond No. 5
®
Apply engine oil
Apply gear oil
Apply molybdenum disulfide oil
Apply brake fluid
Apply wheel bearing grease
Apply low-temperature lithium-soap-based
grease
Apply molybdenum disulfide grease
Apply silicone grease
ESSO beacon 325 grease or Aeroshell
grease #7A
Use new one

CONTENTS
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
FUEL INJECTION SYSTEM
FI
7
ELECTRICAL
ELEC
8
SPECIFICATIONS
SPEC
9

CHAPTER 1.
GENERAL INFORMATION
SNOWMOBILE IDENTIFICATION ............. 1-1
FRAME SERIAL NUMBER .................... 1-1
ENGINE SERIAL NUMBER ................... 1-1
IMPORTANT INFORMATION .................... 1-2
PREPARATION FOR REMOVAL AND
DISASSEMBLY...................................... 1-2
REPLACEMENT PARTS ....................... 1-2
GASKETS, OIL SEALS, AND
O-RINGS................................................ 1-3
LOCK WASHERS/PLATES AND
COTTER PINS ....................................... 1-3
BEARINGS AND OIL SEALS ................ 1-3
CIRCLIPS .............................................. 1-3
LOCTITE® ............................................. 1-3
CHECKING THE CONNECTIONS ........ 1-4
HANDLING THE ELECTRONIC
PARTS ................................................... 1-5
SPECIAL TOOLS ....................................... 1-6
FOR TUNE UP....................................... 1-6
FOR ENGINE SERVICE ........................ 1-6
FOR POWER TRAIN SERVICE ............ 1-9
FOR FUEL INJECTION SERVICE ...... 1-10
FOR ELECTRICAL SERVICE ............. 1-10
CHAPTER 2.
PERIODIC INSPECTION AND
ADJUSTMENT
INTRODUCTION......................................... 2-1
PERIODIC MAINTENANCE CHART
FOR THE EMISSION CONTROL
SYSTEM ..................................................... 2-1
GENERAL MAINTENANCE AND
LUBRICATION CHART .............................. 2-1
ENGINE ...................................................... 2-3
SPARK PLUGS ..................................... 2-3
FUEL LINE INSPECTION ..................... 2-4
COOLING SYSTEM .............................. 2-4
VALVE CLEARANCE
ADJUSTMENT .................................... 2-10
THROTTLE BODY
SYNCHRONIZATION.......................... 2-16
THROTTLE CABLE FREE PLAY
ADJUSTMENT .................................... 2-18
THROTTLE OVERRIDE SYSTEM
(T.O.R.S.) CHECK............................... 2-19
COMPRESSION PRESSURE
MEASUREMENT................................. 2-20
ENGINE OIL LEVEL INSPECTION..... 2-22
ENGINE OIL REPLACEMENT ............ 2-23
CRANKCASE BREATHER HOSE
INSPECTION....................................... 2-27
CYLINDER HEAD BREATHER
HOSE INSPECTION ........................... 2-27
OIL TANK BREATHER HOSE
INSPECTION....................................... 2-28
THROTTLE BODY JOINTS
INSPECTION....................................... 2-28
CHECKING THE AIR FILTER
ELEMENT............................................ 2-29
EXHAUST SYSTEM INSPECTION..... 2-30
POWER TRAIN ........................................ 2-31
SHEAVE OFFSET ADJUSTMENT...... 2-31
DRIVE V-BELT .................................... 2-33
ENGAGEMENT SPEED CHECK ........ 2-35
PARKING BRAKE PAD
INSPECTION....................................... 2-35
PARKING BRAKE ADJUSTMENT ...... 2-36
BRAKE FLUID LEVEL
INSPECTION....................................... 2-37
BRAKE PAD INSPECTION ................. 2-38
BRAKE HOSE INSPECTION .............. 2-38
AIR BLEEDING (HYDRAULIC
BRAKE SYSTEM) ............................... 2-39
DRIVE CHAIN ..................................... 2-40
TRACK TENSION ADJUSTMENT ...... 2-43
SLIDE RUNNER INSPECTION........... 2-45
EXTROVERT SPROCKET WHEELS
(RS90GTZ/RS90LTGTZ) .................... 2-45
MAXIMIZING DRIVE TRACK LIFE ..... 2-46

CHASSIS .................................................. 2-47
SKI/SKI RUNNER ............................... 2-47
STEERING SYSTEM ........................... 2-47
BRAKE LEVER ADJUSTMENT ........... 2-49
LUBRICATION ..................................... 2-49
ELECTRICAL ........................................... 2-52
HEADLIGHT BULB
REPLACEMENT .................................. 2-52
HEADLIGHT BEAM
ADJUSTMENT ..................................... 2-53
BATTERY INSPECTION ..................... 2-54
FUSE INSPECTION ............................ 2-61
TUNING .................................................... 2-63
CLUTCH .............................................. 2-63
GEAR SELECTION ............................. 2-74
HIGH ALTITUDE TUNING ................... 2-75
FRONT SUSPENSION ........................ 2-78
REAR SUSPENSION .......................... 2-81
TROUBLESHOOTING (SKI,
SUSPENSION) .................................... 2-89
CHAPTER 3.
CHASSIS
COWLINGS ................................................ 3-1
SHROUD AND COVERS....................... 3-1
WINDSHIELD AND HEADLIGHT
(RS90GTZ/RS90LTGTZ) ...................... 3-2
WINDSHIELD AND HEADLIGHT
(RST90GTZ) .......................................... 3-3
AIR FILTER CASE ................................. 3-4
SEAT........................................................... 3-5
SEAT (RS90GTZ/RS90LTGTZ) ............ 3-5
BACKREST AND SEAT ............................. 3-6
BACKREST AND SEAT
(RST90GTZ) .......................................... 3-6
STORAGE COMPARTMENT
(RST90GTZ) .......................................... 3-7
STEERING.................................................. 3-8
STEERING (RS90GTZ/
RS90LTGTZ) ......................................... 3-8
STEERING (RST90GTZ) ..................... 3-10
REMOVAL ........................................... 3-14
INSPECTION ....................................... 3-14
INSTALLATION ................................... 3-15
SKI ............................................................ 3-20
SKI ....................................................... 3-20
INSPECTION....................................... 3-21
FRONT SUSPENSION............................. 3-22
HANDLING THE FRONT SHOCK
ABSORBER AND GAS
CYLINDER .......................................... 3-24
DISPOSING OF A FRONT SHOCK
ABSORBER AND GAS
CYLINDER .......................................... 3-24
INSPECTION....................................... 3-24
INSTALLATION ................................... 3-25
CHAPTER 4.
POWER TRAIN
PRIMARY SHEAVE AND DRIVE
V-BELT....................................................... 4-1
REMOVAL ............................................. 4-4
DISASSEMBLY ..................................... 4-4
INSPECTION......................................... 4-5
ASSEMBLY ........................................... 4-8
INSTALLATION ................................... 4-11
SECONDARY SHEAVE ........................... 4-13
DISASSEMBLY ................................... 4-15
INSPECTION....................................... 4-15
ASSEMBLY ......................................... 4-16
INSTALLATION ................................... 4-18
DRIVE CHAIN HOUSING ........................ 4-20
DRIVE CHAIN HOUSING
(RS90GTZ/RS90LTGTZ) .................... 4-20
DRIVE CHAIN HOUSING
(RST90GTZ) ........................................ 4-23
REMOVAL ........................................... 4-26
INSPECTION....................................... 4-26
INSTALLATION (RS90GTZ/
RS90LTGTZ) ....................................... 4-29
INSTALLATION (RST90GTZ) ............ 4-30
SECONDARY SHAFT.............................. 4-32
REMOVAL ........................................... 4-33
INSPECTION....................................... 4-33
INSTALLATION ................................... 4-34
SECONDARY SHAFT AND DRIVE
CHAIN HOUSING INSTALLATION ..... 4-35

BRAKE ..................................................... 4-37
BRAKE (RS90GTZ/RS90LTGTZ) ....... 4-37
BRAKE (RST90GTZ) ........................... 4-38
BRAKE PAD REPLACEMENT ............ 4-39
BRAKE CALIPER AND PARKING
BRAKE (RS90GTZ/RS90LTGTZ) ....... 4-42
BRAKE CALIPER AND PARKING
BRAKE (RST90GTZ) ........................... 4-44
BRAKE CALIPER DISASSEMBLY ...... 4-46
BRAKE CALIPER INSPECTION
AND REPAIR ....................................... 4-47
BRAKE CALIPER ASSEMBLY ............ 4-48
BRAKE CALIPER INSTALLATION ...... 4-49
BRAKE MASTER CYLINDER
(RS90GTZ/RS90LTGTZ) .................... 4-50
BRAKE MASTER CYLINDER
(RST90GTZ) ........................................ 4-52
INSPECTION ....................................... 4-54
BRAKE MASTER CYLINDER
ASSEMBLY.......................................... 4-54
INSTALLATION ................................... 4-55
SLIDE RAIL SUSPENSION...................... 4-56
SLIDE RAIL SUSPENSION
(RS90GTZ) .......................................... 4-56
SLIDE RAIL SUSPENSION
(RS90LTGTZ) ...................................... 4-62
SLIDE RAIL SUSPENSION
(RST90GTZ) ........................................ 4-68
REMOVAL ........................................... 4-75
HANDLING THE REAR SHOCK
ABSORBER AND GAS CYLINDER..... 4-75
DISPOSING OF A REAR SHOCK
ABSORBER AND GAS CYLINDER..... 4-76
INSPECTION ....................................... 4-77
ASSEMBLY.......................................... 4-78
INSTALLATION ................................... 4-79
TROUBLESHOOTING ......................... 4-79
FRONT AXLE AND TRACK ..................... 4-82
INSPECTION ....................................... 4-83
INSTALLATION ................................... 4-83
CHAPTER 5.
ENGINE
FUEL TANK ................................................ 5-1
REMOVAL ............................................. 5-2
INSPECTION ......................................... 5-2
INSTALLATION ..................................... 5-3
EXHAUST PIPE AND MUFFLER .............. 5-5
INSTALLATION ..................................... 5-7
OIL TANK................................................... 5-9
ENGINE ASSEMBLY ............................... 5-10
LEADS AND HOSES........................... 5-10
ENGINE ASSEMBLY .......................... 5-13
REMOVAL ........................................... 5-15
INSTALLATION ................................... 5-15
CAMSHAFTS ........................................... 5-17
CYLINDER HEAD COVER.................. 5-17
CAMSHAFTS ...................................... 5-18
REMOVAL ........................................... 5-19
INSPECTION....................................... 5-20
INSTALLATION ................................... 5-24
CYLINDER HEAD .................................... 5-28
REMOVAL ........................................... 5-29
INSPECTION....................................... 5-29
INSTALLATION ................................... 5-30
VALVES AND VALVE SPRINGS ............ 5-32
REMOVAL ........................................... 5-33
INSPECTION....................................... 5-34
INSTALLATION ................................... 5-40
AC MAGNETO ROTOR AND STARTER
CLUTCH ................................................... 5-43
REMOVAL ........................................... 5-44
INSPECTION....................................... 5-45
INSTALLATION ................................... 5-46
OIL PAN AND OIL PUMP ........................ 5-48
REMOVAL ........................................... 5-51
INSPECTION....................................... 5-51
INSTALLATION ................................... 5-53
CRANKCASE........................................... 5-56
REMOVAL ........................................... 5-58
INSPECTION....................................... 5-59
INSTALLATION ................................... 5-60
CONNECTING RODS AND PISTONS .... 5-65
REMOVAL ........................................... 5-66
INSPECTION....................................... 5-67
INSTALLATION ................................... 5-73
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The 2012 Yamaha VECTOR / LTX / RS VECTOR / LTX / RS VENTURE GT Snowmobile Service Manual offers a sequential, step-by-step format for easy reference. It contains comprehensive explanations of disassembly, repair, assembly, and inspection operations. Each chapter includes exploded diagrams before the disassembly section, aiding in the identification of correct procedures.