Yamaha VMX12 2001, Service Manual

Page: 127 / 454

ENG
CHAPTER 4
ENGINE
ENGINE REMOVAL ....................................................................................... 4-1
EXHAUST PIPE, MUFFLER AND AIR BAFFLE PLATES ....................... 4-1
BRAKE PEDAL, FOOTLEST (RIGHT), MASTER CYLINDER
AND GROUND LEAD .............................................................................. 4-2
LEADS, CABLES AND HOSES ............................................................... 4-3
ENGINE MOUNTING BOLTS .................................................................. 4-4
INSTALLING THE ENGINE ...................................................................... 4-6
CAMSHAFT .................................................................................................... 4-7
CYLINDER HEAD COVERS .................................................................... 4-7
CAMSHAFTS ........................................................................................... 4-9
REMOVING THE CAMSHAFTS ............................................................. 4-10
CHECKING THE CAMSHAFTS ............................................................. 4-11
CHECKING THE TIMING CHAIN, CAMSHAFT SPROCKETS,
AND TIMING CHAIN GUIDES .............................................................. 4-13
CHECKING THE TIMING CHAIN TENSIONER ..................................... 4-13
INSTALLING THE CAMSHAFTS ........................................................... 4-14
CYLINDER HEADS ...................................................................................... 4-21
REMOVING THE CYLINDER HEADS ................................................... 4-22
CHECKING THE CYLINDER HEADS .................................................... 4-22
INSTALLING THE CYLINDER HEAD .................................................... 4-23
VALVES AND VALVE SPRINGS ................................................................. 4-24
REMOVING THE VALVES ..................................................................... 4-25
CHECKING THE VALVES AND VALVE GUIDES ................................. 4-26
CHECKING THE VALVE SEATS ........................................................... 4-28
CHECKING THE VALVE SPRINGS ....................................................... 4-30
CHECKING THE VALVE LIFTERS ........................................................ 4-31
INSTALLING THE VALVES ................................................................... 4-31
CLUTCH ....................................................................................................... 4-33
CRANKCASE COVER (RIGHT SIDE) ................................................... 4-33
CLUTCH ASSEMBLY ............................................................................. 4-34
REMOVING THE CLUTCH .................................................................... 4-36
CHECKING THE FRICTION PLATES .................................................... 4-36
CHECKING THE CLUTCH PLATES ...................................................... 4-37
CHECKING THE CLUTCH SPRING PLATE........................................... 4-37
CHECKING THE CLUTCH HOUSING ................................................... 4-38
CHECKING THE CLUTCH BOSS .......................................................... 4-38
CHECKING THE PRESSURE PLATE ................................................... 4-38
CHECKING THE CLUTCH PUSH RODS .............................................. 4-39
CHECKING THE PRIMARY DRIVE ....................................................... 4-39
INSTALLING THE CLUTCH ................................................................... 4-39