Yamaha WR450FB 2012, Owner'S Service Manual

Page: 209 / 392

6
ENGINE
ENGINE REMOVAL..........................................................................................6-1
REMOVING THE ENGINE .........................................................................6-4
CLEANING THE SPARK ARRESTER .......................................................6-4
INSTALLING THE ENGINE........................................................................6-5
INSTALLING THE EXHAUST PIPE AND MUFFLER.................................6-5
INSTALLING THE SHIFT PEDAL ..............................................................6-6
CAMSHAFT ......................................................................................................6-7
REMOVING THE CAMSHAFT ...................................................................6-9
CHECKING THE CAMSHAFT....................................................................6-9
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........6-11
CHECKING THE TIMING CHAIN TENSIONERS ....................................6-11
CHECKING THE DECOMPRESSION SYSTEM......................................6-12
INSTALLING THE CAMSHAFTS .............................................................6-12
CYLINDER HEAD...........................................................................................6-14
REMOVING THE CYLINDER HEAD........................................................6-15
CHECKING THE TIMING CHAIN GUIDE (EXHAUST SIDE)...................6-15
CHECKING THE CYLINDER HEAD ........................................................6-15
INSTALLING THE CYLINDER HEAD ......................................................6-16
VALVES AND VALVE SPRINGS ...................................................................6-18
REMOVING THE VALVES .......................................................................6-19
CHECKING THE VALVES AND VALVE GUIDES....................................6-20
CHECKING THE VALVE SEATS .............................................................6-21
CHECKING THE VALVE SPRINGS.........................................................6-23
CHECKING THE VALVE LIFTERS ..........................................................6-24
INSTALLING THE VALVES......................................................................6-24
CYLINDER AND PISTON...............................................................................6-26
REMOVING THE PISTON........................................................................6-27
CHECKING THE CYLINDER AND PISTON ............................................6-27
CHECKING THE PISTON RINGS............................................................6-28
CHECKING THE PISTON PIN .................................................................6-29
INSTALLING THE PISTON AND CYLINDER ..........................................6-29
ELECTRIC STARTER ....................................................................................6-31
CHECKING THE STARTER MOTOR ......................................................6-33
ASSEMBLING THE STARTER MOTOR ..................................................6-34
CLUTCH..........................................................................................................6-35
REMOVING THE CLUTCH ......................................................................6-39
CHECKING THE FRICTION PLATES......................................................6-39
CHECKING THE CLUTCH PLATES ........................................................6-39
CHECKING THE CLUTCH SPRINGS......................................................6-39