Yamaha YFM660RN, Service Manual, Page: 10 / 328

CHAPTER 5.
ENGINE
ENGINE REMOVAL ...................................................................................... 5-1
MUFFLER AND EXHAUST PIPES ....................................................... 5-1
LEFT FOOTREST ................................................................................. 5-2
LEADS, CABLES AND HOSES ............................................................ 5-3
ENGINE MOUNTING BOLTS ............................................................... 5-5
INSTALLING THE ENGINE ................................................................... 5-7
CYLINDER HEAD COVER ........................................................................... 5-8
REMOVING THE CYLINDER HEAD COVER ..................................... 5-10
CHECKING THE CYLINDER HEAD COVER ..................................... 5-10
CHECKING THE TAPPET COVER ..................................................... 5-11
INSTALLING THE CYLINDER HEAD COVER ................................... 5-11
ROCKER ARMS ......................................................................................... 5-12
REMOVING THE ROCKER ARM ....................................................... 5-14
CHECKING THE ROCKER ARM ........................................................ 5-14
INSTALLING THE ROCKER ARM ...................................................... 5-15
CAMSHAFT AND CYLINDER HEAD ......................................................... 5-16
REMOVING THE CAMSHAFT AND CYLINDER HEAD ..................... 5-18
CHECKING THE CAMSHAFT ............................................................. 5-19
CHECKING THE CAMSHAFT SPROCKET ........................................ 5-19
CHECKING THE DECOMPRESSION SYSTEM ................................. 5-19
CHECKING THE TIMING CHAIN GUIDE ........................................... 5-20
CHECKING THE TIMING CHAIN TENSIONER .................................. 5-20
CHECKING THE CYLINDER HEAD ................................................... 5-20
INSTALLING THE CAMSHAFT AND CYLINDER HEAD .................... 5-21
VALVES AND VALVE SPRINGS ............................................................... 5-24
REMOVING THE VALVE AND VALVE SPRING ................................ 5-25
CHECKING THE VALVE AND VALVE SPRING ................................. 5-26
INSTALLING THE VALVE AND VALVE SPRING ............................... 5-30
CYLINDER AND PISTON ........................................................................... 5-32
REMOVING THE PISTON .................................................................. 5-33
CHECKING THE CYLINDER AND PISTON ....................................... 5-33
CHECKING THE PISTON RING ......................................................... 5-35
CHECKING THE PISTON PIN INSPECTION ..................................... 5-36
INSTALLING THE PISTON ................................................................. 5-36
INSTALLING THE CYLINDER ............................................................ 5-37
AC MAGNETO ............................................................................................ 5-38
REMOVING THE AC MAGNETO ROTOR .......................................... 5-40
CHECKING THE COIL ........................................................................ 5-40
CHECKING THE STARTER CLUTCH ................................................ 5-41
INSTALLING THE AC MAGNETO ROTOR ........................................ 5-42