5
ENGINE
ENGINE REMOVAL (YP125R)........................................................................5-1
INSTALLING THE ENGINE.......................................................................5-5
CYLINDER HEAD (YP125R)...........................................................................5-7
REMOVING THE CYLINDER HEAD.........................................................5-9
CHECKING THE CYLINDER HEAD .........................................................5-9
CHECKING THE CAMSHAFT SPROCKET............................................5-10
CHECKING THE TIMING CHAIN TENSIONER......................................5-10
INSTALLING THE CYLINDER HEAD .....................................................5-11
CAMSHAFT (YP125R) ..................................................................................5-14
REMOVING THE CAMSHAFT................................................................5-15
CHECKING THE CAMSHAFT.................................................................5-15
CHECKING THE DECOMPRESSION SYSTEM.....................................5-15
CHECKING THE ROCKER ARMS AND ROCKER ARM SHAFTS ........5-16
INSTALLING THE CAMSHAFT AND ROCKER ARMS ..........................5-17
VALVES AND VALVE SPRINGS (YP125R).................................................5-18
REMOVING THE VALVES......................................................................5-19
CHECKING THE VALVES AND VALVE GUIDES ..................................5-19
CHECKING THE VALVE SEATS............................................................5-21
CHECKING THE VALVE SPRINGS........................................................5-22
INSTALLING THE VALVES ....................................................................5-23
CYLINDER AND PISTON (YP125R).............................................................5-25
REMOVING THE PISTON ......................................................................5-26
CHECKING THE CYLINDER AND PISTON ...........................................5-26
CHECKING THE PISTON RINGS...........................................................5-27
CHECKING THE PISTON PIN................................................................5-28
CHECKING THE TIMING CHAIN GUIDE ...............................................5-28
INSTALLING THE PISTON AND CYLINDER .........................................5-28
V-BELT AUTOMATIC TRANSMISSION (YP125R) ......................................5-30
REMOVING THE PRIMARY SHEAVE....................................................5-33
REMOVING THE SECONDARY SHEAVE .............................................5-33
DISASSEMBLING THE SECONDARY SHEAVE....................................5-34
CHECKING THE CLUTCH HOUSING ....................................................5-34
CHECKING THE CLUTCH SHOES ........................................................5-34
CHECKING THE V-BELT........................................................................5-34
CHECKING THE PRIMARY SHEAVE ....................................................5-35
CHECKING THE PRIMARY SHEAVE WEIGHTS...................................5-35
CHECKING THE PRIMARY SHEAVE SLIDERS ....................................5-35
CHECKING THE SECONDARY SHEAVE ..............................................5-35
ASSEMBLING THE PRIMARY SHEAVE ................................................5-35
ASSEMBLING THE SECONDARY SHEAVE..........................................5-36
INSTALLING THE V-BELT......................................................................5-37
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