Yamaha YZ450FP 2023, Owner'S Service Manual

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ENGINE
LUBRICATION SYSTEM CHART AND DIAGRAMS
.......................................5-1
ENGINE OIL LUBRICATION CHART.........................................................5-1
ENGINE REMOVAL
..........................................................................................5-2
REMOVING THE ENGINE .........................................................................5-7
INSTALLING THE ENGINE........................................................................5-7
INSTALLING THE EXHAUST PIPE AND MUFFLER.................................5-8
CAMSHAFT
....................................................................................................5-10
REMOVING THE CAMSHAFT .................................................................5-12
CHECKING THE CAMSHAFT..................................................................5-12
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........5-13
CHECKING THE TIMING CHAIN TENSIONERS.....................................5-14
CHECKING THE DECOMPRESSION SYSTEM ......................................5-14
INSTALLING THE CAMSHAFTS .............................................................5-14
CYLINDER HEAD ...........................................................................................5-17
REMOVING THE CYLINDER HEAD........................................................5-19
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE).......................5-19
CHECKING THE CYLINDER HEAD ........................................................5-19
INSTALLING THE CYLINDER HEAD ......................................................5-19
VALVES AND VALVE SPRINGS
....................................................................5-22
REMOVING THE VALVES .......................................................................5-24
CHECKING THE VALVES AND VALVE GUIDES....................................5-25
CHECKING THE VALVE SEATS .............................................................5-26
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............................................................5-32
CHECKING THE PISTON PIN .................................................................5-33
INSTALLING THE PISTON AND CYLINDER ..........................................5-33
GENERATOR ..................................................................................................5-35
REMOVING THE GENERATOR ..............................................................5-38
CHECKING THE GENERATOR...............................................................5-38
CHECKING THE WOODRUFF KEY ........................................................5-38
INSTALLING THE GENERATOR.............................................................5-38
ELECTRIC STARTER
.....................................................................................5-40
CHECKING THE STARTER MOTOR ......................................................5-42
ASSEMBLING THE STARTER MOTOR ..................................................5-42