Yamaha XC125 Service Manual page 37

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CHAPTER 3.
ENGINE OVERHAUL
ENGINE REMOVAL ........................................... 3-1
PREPARATION FOR REMOVAL .............................. 3-1
COVERS AND FOOTREST BOARD ............................ 3-2
BATTERY LEAD ...................... . ......... . .......... 3-2
AIR FILTER ELEMENT CASE AND THROTTLE CABLE ........... 3-2
CARBURETOR HOSES ...................................... 3-2
REAR WHEEL ............................................. 3-2
CONNECTORS ............................................. 3-3
ENGINE .................................................. 3-3
COMPONENTS ............................................. 3-3
ENGINE DISASSEMBLY ........................................ 3-3
CAM CHAIN TENSIONER AND CYLINDER HEAD ................ 3-3
CYLINDER AND PISTON .................................... 3-4
PRIMARY AND SECONDARY SHEAVE ........................ 3-4
STARTER SYSTEM ......................................... 3-5 _
CDI MAGNETO ............................................ 3-6 _-'IlPJ
OIL PUMP................................................. 3-6
TRANSMISSION ........................................... 3-6
CRANKCASE AND CRANKSHAFT ............................ 3-7
INSPECTION AND REPAIR ..................................... 3-8
CYLINDER HEAD .......................................... 3-8
VALVE, VALVE GUIDE, AND VALVE SEAT .................... 3-9
ROCKER ARM AND ROCKER ARM SHAFTS .................... 3-16
CAMSHAFT ............................................... 3-17
CAM CHAIN ............................................... 3-17
CYLINDER ................................................ 3-18
PISTON, PISTON RING, AND PISTON PIN ...................... 3-19
STARTER DRIVES ......................................... 3-21
OIL PUMP.................................. ............... 3-22
OIL GALLERY PIPE ........................................ 3-22
CRANKSHAFT AND CONNECTING ROD ....................... 3-23
TRANSMISSION ........................................... 3-24
PRIMARY SHEAVE ......................................... 3-24
SECONDARY SHEAVE ................................. . .... 3-25
V-BELT ................................................... 3-27