Yamaha YZ450FX 2021 Owner's Service Manual page 186

ELECTRIC STARTER.....................................................................................5-42
CHECKING THE STARTER MOTOR ......................................................5-44
ASSEMBLING THE STARTER MOTOR ..................................................5-44
CLUTCH..........................................................................................................5-46
REMOVING THE CLUTCH ......................................................................5-49
CHECKING THE FRICTION PLATES ......................................................5-49
CHECKING THE CLUTCH PLATES ........................................................5-49
CHECKING THE CLUTCH SPRINGS ......................................................5-49
CHECKING THE CLUTCH HOUSING .....................................................5-49
CHECKING THE CLUTCH BOSS ............................................................5-49
CHECKING THE PRESSURE PLATE .....................................................5-50
CHECKING THE PUSH LEVER SHAFT ..................................................5-50
CHECKING THE PUSH RODS ................................................................5-50
CHECKING THE PRIMARY DRIVE GEAR ..............................................5-50
CHECKING THE PRIMARY DRIVEN GEAR............................................5-50
INSTALLING THE CLUTCH .....................................................................5-50
SHIFT SHAFT .................................................................................................5-54
REMOVING THE SEGMENT ...................................................................5-55
CHECKING THE SHIFT SHAFT ..............................................................5-55
CHECKING THE STOPPER LEVER........................................................5-55
INSTALLING THE SHIFT SHAFT ............................................................5-55
OIL PUMP .......................................................................................................5-58
REMOVING THE BALANCER..................................................................5-60
CHECKING THE OIL PUMP ....................................................................5-60
ASSEMBLING THE OIL PUMP ................................................................5-60
INSTALLING THE OIL PUMP ..................................................................5-61
CRANKCASE .................................................................................................5-63
DISASSEMBLING THE CRANKCASE .....................................................5-65
CHECKING THE TIMING CHAIN GUIDE (EXHAUST SIDE)...................5-65
CHECKING THE CRANKCASE ...............................................................5-65
ASSEMBLING THE CRANKCASE ...........................................................5-66
CRANKSHAFT AND BALANCER SHAFT.....................................................5-67
REMOVING THE CRANKSHAFT.............................................................5-68
CHECKING THE CRANKSHAFT .............................................................5-68
INSTALLING THE CRANKSHAFT ...........................................................5-69
TRANSMISSION.............................................................................................5-70
REMOVING THE TRANSMISSION..........................................................5-71
CHECKING THE SHIFT FORKS ..............................................................5-71
CHECKING THE SHIFT DRUM ASSEMBLY ...........................................5-71
CHECKING THE TRANSMISSION ..........................................................5-71
INSTALLING THE TRANSMISSION ........................................................5-72