Yamaha YZ 2019 Series, Owner'S Service Manual

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ENGINE
ENGINE REMOVAL
..........................................................................................5-1
REMOVING THE SILENCER .....................................................................5-5
REMOVING THE EXHAUST PIPE 2..........................................................5-5
REMOVING THE DRIVE SPROCKET .......................................................5-5
REMOVING THE ENGINE .........................................................................5-5
CHECKING THE SILENCER AND EXHAUST PIPE..................................5-6
CHANGING THE SILENCER FIBER..........................................................5-6
INSTALLING THE ENGINE........................................................................5-7
INSTALLING THE BRAKE PEDAL.............................................................5-8
INSTALLING THE DRIVE SPROCKET......................................................5-8
INSTALLING THE EXHAUST PIPE AND MUFFLER.................................5-9
CAMSHAFT ....................................................................................................5-11
REMOVING THE CAMSHAFT .................................................................5-13
CHECKING THE CAMSHAFT..................................................................5-14
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........5-15
CHECKING THE TIMING CHAIN TENSIONERS.....................................5-15
CHECKING THE DECOMPRESSION SYSTEM ......................................5-16
INSTALLING THE CAMSHAFTS .............................................................5-16
CYLINDER HEAD
...........................................................................................5-19
REMOVING THE CYLINDER HEAD........................................................5-20
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE).......................5-20
CHECKING THE CYLINDER HEAD ........................................................5-20
INSTALLING THE CYLINDER HEAD ......................................................5-21
VALVES AND VALVE SPRINGS ....................................................................5-22
REMOVING THE VALVES .......................................................................5-23
CHECKING THE VALVES AND VALVE GUIDES....................................5-24
CHECKING THE VALVE SEATS .............................................................5-25
CHECKING THE VALVE SPRINGS.........................................................5-27
CHECKING THE VALVE LIFTERS ..........................................................5-27
INSTALLING THE VALVES......................................................................5-27
CYLINDER AND PISTON
...............................................................................5-29
REMOVING THE PISTON........................................................................5-30
CHECKING THE CYLINDER AND PISTON.............................................5-30
CHECKING THE PISTON RINGS............................................................5-31
CHECKING THE PISTON PIN .................................................................5-31
INSTALLING THE PISTON AND CYLINDER ..........................................5-32
ELECTRIC STARTER
.....................................................................................5-34
CHECKING THE STARTER MOTOR ......................................................5-36
ASSEMBLING THE STARTER MOTOR ..................................................5-37
CLUTCH ..........................................................................................................5-39
REMOVING THE CLUTCH ......................................................................5-42