Yamaha YFZ450S 2003 Service Manual page 140

ENGINE REMOVAL ........................................................................................4-1
MUFFLER AND EXHAUST PIPE.............................................................. 4-1
INSTALLING THE EXHAUST PIPE AND MUFFLER................................4-2
LEADS, CABLES AND HOSES ................................................................4-4
ENGINE MOUNTING BOLTS ...................................................................4-6
INSTALLING THE ENGINE....................................................................... 4-8
CAMSHAFTS...................................................................................................4-9
CYLINDER HEAD COVER........................................................................ 4-9
CAMSHAFTS .......................................................................................... 4-10
REMOVING THE CAMSHAFTS..............................................................4-11
CHECKING THE CAMSHAFTS ..............................................................4-12
CHECKING THE CAMSHAFT SPROCKETS .........................................4-14
CHECKING THE DECOMPRESSION SYSTEM..................................... 4-14
CHECKING THE TIMING CHAIN GUIDE ............................................... 4-14
CHECKING THE TIMING CHAIN TENSIONER...................................... 4-15
INSTALLING THE CAMSHAFTS ............................................................ 4-15
CYLINDER HEAD.......................................................................................... 4-18
REMOVING THE CYLINDER HEAD.......................................................4-20
CHECKING THE CYLINDER HEAD .......................................................4-20
CHECKING THE OIL DELIVERY PIPE...................................................4-21
CHECKING THE TIMING CHAIN GUIDE ............................................... 4-21
INSTALLING THE CYLINDER HEAD .....................................................4-21
VALVES AND VALVE SPRINGS.................................................................. 4-24
REMOVING THE VALVES AND VALVE SPRINGS ...............................4-26
CHECKING THE VALVES AND VALVE SPRINGS ................................4-27
CHECKING THE VALVE LIFTERS ......................................................... 4-32
INSTALLING THE VALVES AND VALVE SPRINGS ..............................4-32
CYLINDER AND PISTON.............................................................................. 4-34
REMOVING THE PISTON ...................................................................... 4-35
CHECKING THE CYLINDER AND PISTON ...........................................4-35
CHECKING THE PISTON RINGS........................................................... 4-37
CHECKING THE PISTON PIN ................................................................4-38
INSTALLING THE PISTON ..................................................................... 4-40
INSTALLING THE CYLINDER ................................................................4-41
A.C. MAGNETO............................................................................................. 4-42
REMOVING THE A.C. MAGNETO ROTOR............................................4-44
CHECKING THE STATOR COIL AND PICKUP COIL ............................ 4-44
CHECKING THE STARTER CLUTCH ....................................................4-45
CHECKING THE TORQUE LIMITER......................................................4-46
INSTALLING THE A.C. MAGNETO ROTOR ..........................................4-46
CHAPTER 4
ENGINE
ENG