Yamaha YXR70FX Service Manual page 11

CYLINDER HEAD.......................................................................................... 4-11
REMOVING THE CYLINDER HEAD.......................................................4-14
CHECKING THE CAMSHAFT SPROCKET............................................4-15
CHECKING THE TAPPET COVERS ......................................................4-15
CHECKING THE TIMING CHAIN TENSIONER...................................... 4-15
CHECKING THE CYLINDER HEAD .......................................................4-16
INSTALLING THE CYLINDER HEAD .....................................................4-17
ROCKER ARMS AND CAMSHAFT ..............................................................4-20
REMOVING THE ROCKER ARMS AND CAMSHAFT............................ 4-22
CHECKING THE CAMSHAFT.................................................................4-22
CHECKING THE DECOMPRESSION SYSTEM..................................... 4-23
CHECKING THE ROCKER ARMS AND ROCKER ARM SHAFTS ........ 4-23
INSTALLING THE CAMSHAFT AND ROCKER ARMS .......................... 4-24
VALVES AND VALVE SPRINGS.................................................................. 4-27
REMOVING THE VALVES AND VALVE SPRINGS ...............................4-28
CHECKING THE VALVES AND VALVE SPRINGS ................................4-29
INSTALLING THE VALVES AND VALVE SPRINGS ..............................4-33
CYLINDER AND PISTON.............................................................................. 4-36
REMOVING THE PISTON ...................................................................... 4-37
CHECKING THE CYLINDER AND PISTON ...........................................4-37
CHECKING THE PISTON RINGS........................................................... 4-39
CHECKING THE PISTON PIN ................................................................4-40
INSTALLING THE PISTON AND CYLINDER .........................................4-41
AC MAGNETO...............................................................................................4-44
REMOVING THE AC MAGNETO ROTOR.............................................. 4-47
CHECKING THE STATOR COIL AND CRANKSHAFT POSITION
SENSOR ................................................................................................4-48
CHECKING THE STARTER CLUTCH ....................................................4-48
CHECKING THE TORQUE LIMITER......................................................4-49
INSTALLING THE AC MAGNETO ROTOR ............................................4-49
BALANCER GEARS AND OIL PUMP GEARS ............................................4-51
REMOVING THE BALANCER DRIVEN GEAR AND OIL PUMP
DRIVEN GEAR ....................................................................................... 4-53
CHECKING THE OIL PUMP DRIVE .......................................................4-53
CHECKING THE BALANCER DRIVE .....................................................4-53
INSTALLING THE BALANCER DRIVE GEAR, BALANCER DRIVEN
GEAR, AND OIL PUMP DRIVEN GEAR ................................................ 4-54