Engine - Yamaha RAPTOR YFM125RA Service Manual

ENGINE REMOVAL ......................................................................................5-1
INSTALLING THE ENGINE ....................................................................5-4
INSTALLING THE MUFFLER AND EXHAUST PIPE..............................5-4
CYLINDER HEAD.........................................................................................5-6
REMOVING THE CYLINDER HEAD ......................................................5-8
CHECKING THE CYLINDER HEAD ......................................................5-8
CHECKING THE TAPPET COVERS AND CAMSHAFT SPROCKET
COVER ...................................................................................................5-9
CHECKING THE CAMSHAFT SPROCKET ...........................................5-9
CHECKING THE TIMING CHAIN TENSIONER .....................................5-9
INSTALLING THE CYLINDER HEAD ...................................................5-10
CAMSHAFT ................................................................................................5-13
REMOVING THE ROCKER ARMS AND CAMSHAFT .........................5-14
CHECKING THE CAMSHAFT ..............................................................5-14
CHECKING THE ROCKER ARMS AND ROCKER ARM SHAFTS ......5-15
INSTALLING THE CAMSHAFT AND ROCKER ARMS ........................5-16
VALVES AND VALVE SPRINGS ................................................................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......................................................5-23
INSTALLING THE VALVES...................................................................5-24
CYLINDER AND PISTON ...........................................................................5-26
REMOVING THE PISTON ....................................................................5-27
CHECKING THE TIMING CHAIN GUIDE.............................................5-27
CHECKING THE CYLINDER AND PISTON.........................................5-27
CHECKING THE PISTON RINGS ........................................................5-28
CHECKING THE PISTON PIN .............................................................5-29
INSTALLING THE PISTON AND CYLINDER .......................................5-30
CLUTCH......................................................................................................5-31
REMOVING THE CLUTCH...................................................................5-35
CHECKING THE FRICTION PLATES ..................................................5-35
CHECKING THE CLUTCH PLATES.....................................................5-35
CHECKING THE CLUTCH SPRINGS ..................................................5-36
CHECKING THE CLUTCH HOUSING .................................................5-36
CHECKING THE CLUTCH BOSS ........................................................5-36
CHECKING THE PRESSURE PLATE ..................................................5-36
CHECKING THE CLUTCH PUSH LEVER AND CLUTCH PUSH
ROD ......................................................................................................5-37
CHECKING THE PRIMARY DRIVE GEAR AND PRIMARY DRIVEN
GEAR....................................................................................................5-37
INSTALLING THE CLUTCH..................................................................5-37

ENGINE

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