Yamaha RS90K, Service Manual

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CHAPTER 1.
GENERAL INFORMATION
MACHINE IDENTIFICATION ............................ 1-1
FRAME SERIAL NUMBER ......................... 1-1
ENGINE SERIAL NUMBER........................ 1-1
IMPORTANT INFORMATION .......................... 1-2
PREPARATION FOR REMOVAL AND
DISASSEMBLY........................................... 1-2
ALL 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
SPECIAL TOOLS ............................................. 1-4
FOR TUNE UP............................................ 1-4
FOR ENGINE SERVICE............................. 1-4
FOR POWER TRAIN SERVICE ................. 1-7
FOR CARBURETION SERVICE ................ 1-8
FOR ELECTRICAL SERVICE .................... 1-8
CHAPTER 2.
PERIODIC INSPECTION AND
ADJUSTMENT
INTRODUCTION ............................................... 2-1
PERIODIC MAINTENANCE CHART ................ 2-1
ENGINE ............................................................ 2-3
SPARK PLUGS........................................... 2-3
FUEL LINE INSPECTION........................... 2-3
COOLING SYSTEM.................................... 2-4
VALVE CLEARANCE ADJUSTMENT ........ 2-7
CARBURETOR SYNCHRONIZATION ..... 2-13
ENGINE IDLE SPEED ADJUSTMENT..... 2-14
THROTTLE CABLE FREE PLAY
ADJUSTMENT.......................................... 2-15
THROTTLE OVERRIDE SYSTEM
(T.O.R.S.) CHECK .................................... 2-16
COMPRESSION PRESSURE
MEASUREMENT ...................................... 2-17
ENGINE OIL LEVEL INSPECTION .......... 2-18
ENGINE OIL REPLACEMENT ................. 2-20
CRANKCASE BREATHER HOSE
INSPECTION ............................................ 2-23
CARBURETOR JOINTS INSPECTION .... 2-23
CHECKING THE AIR FILTER
ELEMENT ................................................. 2-23
EXHAUST SYSTEM INSPECTION .......... 2-24
POWER TRAIN ............................................... 2-25
SHEAVE OFFSET ADJUSTMENT ........... 2-25
DRIVE V-BELT.......................................... 2-27
ENGAGEMENT SPEED CHECK.............. 2-29
PARKING BRAKE ADJUSTMENT............ 2-30
BRAKE FLUID LEVEL INSPECTION ....... 2-30
BRAKE PAD INSPECTION....................... 2-31
BRAKE HOSE INSPECTION.................... 2-31
AIR BLEEDING (HYDRAULIC BRAKE
SYSTEM) .................................................. 2-32
DRIVE CHAIN ........................................... 2-33
TRACK TENSION ADJUSTMENT............ 2-35
SLIDE RUNNER INSPECTION ................ 2-37
MAXIMIZING DRIVE TRACK LIFE ........... 2-37
CHASSIS ........................................................ 2-39
SKI/SKI RUNNER ..................................... 2-39
STEERING SYSTEM ................................ 2-40
LUBRICATION .......................................... 2-41
ELECTRICAL ................................................. 2-44
HEADLIGHT BEAM ADJUSTMENT ......... 2-44
BATTERY INSPECTION........................... 2-44
FUSE INSPECTION.................................. 2-52
SPEEDOMETER UNIT INSPECTION ...... 2-54
TUNING .......................................................... 2-55
CARBURETOR TUNING .......................... 2-55
CLUTCH.................................................... 2-62
GEAR SELECTION................................... 2-67
HIGH ALTITUDE TUNING ........................ 2-73
FRONT SUSPENSION ............................. 2-74
REAR SUSPENSION................................ 2-75
CHAPTER 3.
CHASSIS
STEERING ........................................................ 3-1
RS90/RS90R/RSG90/RST90/RST90TF ..... 3-1
RS90M ........................................................ 3-3
REMOVAL................................................... 3-7
INSPECTION .............................................. 3-7
INSTALLATION........................................... 3-8
SKI .................................................................. 3-12
RS90/RS90R/RSG90 “USA/Canada” ....... 3-12
RSG90 “Europe”/RST90 “Europe”/
RST90TF................................................... 3-13
RS90M ...................................................... 3-14
RST90 “USA/Canada”............................... 3-15
INSPECTION ............................................ 3-16
INSTALLATION
(RST90 “USA/Canada”) ............................ 3-17