Engine - Yamaha YZ 2017 Series Owner's Service Manual

ENGINE REMOVAL..........................................................................................5-1
REMOVING THE SILENCER .....................................................................5-6
REMOVING THE EXHAUST PIPE 2..........................................................5-6
REMOVING THE DRIVE SPROCKET .......................................................5-6
REMOVING THE ENGINE .........................................................................5-7
CHECKING THE SILENCER AND EXHAUST PIPE..................................5-7
CHANGING THE SILENCER FIBER..........................................................5-7
INSTALLING THE ENGINE........................................................................5-8
INSTALLING THE BRAKE PEDAL.............................................................5-9
INSTALLING THE DRIVE SPROCKET......................................................5-9
INSTALLING THE EXHAUST PIPE AND MUFFLER ...............................5-10
CAMSHAFT ....................................................................................................5-12
REMOVING THE CAMSHAFT .................................................................5-14
CHECKING THE CAMSHAFT..................................................................5-15
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........5-16
CHECKING THE TIMING CHAIN TENSIONERS ....................................5-16
CHECKING THE DECOMPRESSION SYSTEM ......................................5-17
INSTALLING THE CAMSHAFTS .............................................................5-17
CYLINDER HEAD...........................................................................................5-19
REMOVING THE CYLINDER HEAD........................................................5-21
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE).......................5-21
CHECKING THE CYLINDER HEAD ........................................................5-21
INSTALLING THE CYLINDER HEAD ......................................................5-22
VALVES AND VALVE SPRINGS ...................................................................5-23
REMOVING THE VALVES .......................................................................5-24
CHECKING THE VALVES AND VALVE GUIDES....................................5-25
CHECKING THE VALVE SEATS .............................................................5-27
CHECKING THE VALVE SPRINGS.........................................................5-28
CHECKING THE VALVE LIFTERS ..........................................................5-29
INSTALLING THE VALVES......................................................................5-29
CYLINDER AND PISTON...............................................................................5-31
REMOVING THE PISTON........................................................................5-32
CHECKING THE CYLINDER AND PISTON ............................................5-32
CHECKING THE PISTON RINGS............................................................5-33
CHECKING THE PISTON PIN .................................................................5-34
INSTALLING THE PISTON AND CYLINDER ..........................................5-34
ELECTRIC STARTER ....................................................................................5-36
CHECKING THE STARTER MOTOR ......................................................5-38
ASSEMBLING THE STARTER MOTOR ..................................................5-39

ENGINE

5