Yamaha WR250FM 2021, Owner'S Service Manual, Page: 199 / 404

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ENGINE
LUBRICATION SYSTEM CHART AND DIAGRAMS
.......................................5-1
ENGINE OIL LUBRICATION CHART.........................................................5-1
LUBRICATION DIAGRAMS .......................................................................5-2
ENGINE REMOVAL ..........................................................................................5-6
REMOVING THE ENGINE .......................................................................5-11
INSTALLING THE ENGINE......................................................................5-11
INSTALLING THE EXHAUST PIPE AND MUFFLER...............................5-12
CAMSHAFT ....................................................................................................5-14
REMOVING THE CAMSHAFT .................................................................5-16
CHECKING THE CAMSHAFT..................................................................5-17
CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET...........5-18
CHECKING THE TIMING CHAIN TENSIONERS.....................................5-18
CHECKING THE DECOMPRESSION SYSTEM ......................................5-18
INSTALLING THE CAMSHAFTS .............................................................5-18
CYLINDER HEAD
...........................................................................................5-21
REMOVING THE CYLINDER HEAD........................................................5-23
CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE).......................5-23
CHECKING THE CYLINDER HEAD ........................................................5-23
INSTALLING THE CYLINDER HEAD ......................................................5-23
VALVES AND VALVE SPRINGS ....................................................................5-26
REMOVING THE VALVES .......................................................................5-27
CHECKING THE VALVES AND VALVE GUIDES....................................5-28
CHECKING THE VALVE SEATS .............................................................5-29
CHECKING THE VALVE SPRINGS.........................................................5-30
CHECKING THE VALVE LIFTERS ..........................................................5-31
INSTALLING THE VALVES......................................................................5-31
CYLINDER AND PISTON
...............................................................................5-33
REMOVING THE PISTON........................................................................5-34
CHECKING THE CYLINDER AND PISTON.............................................5-34
CHECKING THE PISTON RINGS............................................................5-35
CHECKING THE PISTON PIN .................................................................5-35
INSTALLING THE PISTON AND CYLINDER ..........................................5-36
GENERATOR
..................................................................................................5-38
REMOVING THE GENERATOR ..............................................................5-39
CHECKING THE GENERATOR...............................................................5-39
CHECKING THE WOODRUFF KEY ........................................................5-39
INSTALLING THE GENERATOR.............................................................5-39
STARTER CLUTCH ........................................................................................5-41
REMOVING THE STARTER CLUTCH.....................................................5-42