Engine - Yamaha XT250X Service Manual

ENGINE REMOVAL .......................................................................................5-1
INSTALLING THE ENGINE .....................................................................5-4
INSTALLING THE SHIFT PEDAL ............................................................5-4
CYLINDER HEAD ..........................................................................................5-6
REMOVING THE CYLINDER HEAD .......................................................5-8
CHECKING THE CYLINDER HEAD ........................................................5-9
CHECKING THE TAPPET COVERS AND
CAMSHAFT SPROCKET COVER ........................................................5-9
CHECKING THE CAMSHAFT SPROCKET AND
TIMING CHAIN GUIDE (EXHAUST SYSTEM SIDE)............................5-9
CHECKING THE TIMING CHAIN TENSIONER ......................................5-10
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 ...........................5-15
VALVES AND VALVE SPRINGS ..................................................................5-17
REMOVING THE VALVES.......................................................................5-18
CHECKING THE VALVES AND VALVE GUIDES ...................................5-18
CHECKING THE VALVE SEATS.............................................................5-20
CHECKING THE VALVE SPRINGS ........................................................5-21
INSTALLING THE VALVES .....................................................................5-23
CYLINDER AND PISTON ..............................................................................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
INSTALLING THE PISTON AND CYLINDER ..........................................5-28
CLUTCH .........................................................................................................5-30
REMOVING THE CLUTCH ......................................................................5-33
CHECKING THE FRICTION PLATES .....................................................5-33
CHECKING THE CLUTCH PLATES........................................................5-33
CHECKING THE CLUTCH SPRINGS .....................................................5-33
CHECKING THE CLUTCH HOUSING.....................................................5-34
CHECKING THE CLUTCH BOSS............................................................5-34
CHECKING THE PRESSURE PLATE .....................................................5-34
CHECKING THE CLUTCH PUSH RODS ................................................5-34
CHECKING THE PRIMARY DRIVE GEAR..............................................5-34
CHECKING THE PRIMARY DRIVEN GEAR ...........................................5-34
INSTALLING THE CLUTCH.....................................................................5-34

ENGINE

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