Yamaha 2004 YP400 Service Manual page 212

ENGINE REMOVAL ........................................................................................5-1
LEADS, HOSES, EXHAUST PIPE AND MUFFLER .................................5-1
ENGINE..................................................................................................... 5-3
INSTALLING THE ENGINE....................................................................... 5-5
CAMSHAFTS...................................................................................................5-6
CYLINDER HEAD COVER........................................................................ 5-6
CAMSHAFTS ............................................................................................ 5-7
REMOVING THE CAMSHAFTS................................................................5-9
CHECKING THE CAMSHAFTS ..............................................................5-10
CHECKING THE CAMSHAFT SPROCKETS .........................................5-12
CHECKING THE DECOMPRESSION SYSTEM..................................... 5-12
CHECKING THE TIMING CHAIN TENSIONER...................................... 5-13
INSTALLING THE CAMSHAFTS ............................................................ 5-13
CYLINDER HEAD.......................................................................................... 5-17
REMOVING THE CYLINDER HEAD.......................................................5-19
CHECKING THE CYLINDER HEAD .......................................................5-19
CHECKING THE TIMING CHAIN GUIDE (EXHAUST SIDE) ................. 5-20
INSTALLING THE CYLINDER HEAD .....................................................5-20
VALVES AND VALVE SPRINGS.................................................................. 5-21
REMOVING THE VALVES...................................................................... 5-22
CHECKING THE VALVES AND VALVE GUIDES ..................................5-23
CHECKING THE VALVE SEATS ............................................................ 5-25
CHECKING THE VALVE SPRINGS........................................................ 5-27
CHECKING THE VALVE LIFTERS ......................................................... 5-28
INSTALLING THE VALVES .................................................................... 5-28
CYLINDER AND PISTON.............................................................................. 5-30
REMOVING THE PISTON ...................................................................... 5-31
CHECKING THE CYLINDER AND PISTON ...........................................5-31
CHECKING THE PISTON RINGS........................................................... 5-33
CHECKING THE PISTON PIN ................................................................5-34
INSTALLING THE PISTON AND CYLINDER .........................................5-34
CHAPTER 5
ENGINE
ENG