Yamaha WR250F Owner's Service Manual

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Contents

6ENGINEENGINE REMOVAL .........................................................................................6-1REMOVING THE SILENCER.....................................................................6-6REMOVING THE EXHAUST PIPE 2..........................................................6-6REMOVING THE DRIVE SPROCKET .......................................................6-6REMOVING THE ENGINE .........................................................................6-7CLEANING THE SPARK ARRESTER .......................................................6-7CHECKING THE SILENCER AND EXHAUST PIPE..................................6-8INSTALLING THE ENGINE........................................................................6-8INSTALLING THE BRAKE PEDAL ............................................................6-9INSTALLING THE DRIVE SPROCKET......................................................6-9INSTALLING THE EXHAUST PIPE AND MUFFLER.................................6-9CAMSHAFT ....................................................................................................6-11REMOVING THE CAMSHAFT .................................................................6-13CHECKING THE CAMSHAFT..................................................................6-14CHECKING THE TIMING CHAIN AND CAMSHAFT SPROCKET ..........6-15CHECKING THE TIMING CHAIN TENSIONERS ....................................6-15CHECKING THE DECOMPRESSION SYSTEM......................................6-16INSTALLING THE CAMSHAFTS .............................................................6-16CYLINDER HEAD...........................................................................................6-18REMOVING THE CYLINDER HEAD........................................................6-20CHECKING THE TIMING CHAIN GUIDE (INTAKE SIDE) ......................6-20CHECKING THE CYLINDER HEAD ........................................................6-20INSTALLING THE CYLINDER HEAD ......................................................6-21VALVES AND VALVE SPRINGS...................................................................6-22REMOVING THE VALVES.......................................................................6-23CHECKING THE VALVES AND VALVE GUIDES ...................................6-24CHECKING THE VALVE SEATS .............................................................6-26CHECKING THE VALVE SPRINGS.........................................................6-27CHECKING THE VALVE LIFTERS ..........................................................6-28INSTALLING THE VALVES .....................................................................6-28CYLINDER AND PISTON...............................................................................6-30REMOVING THE PISTON .......................................................................6-31CHECKING THE CYLINDER AND PISTON ............................................6-31CHECKING THE PISTON RINGS............................................................6-32CHECKING THE PISTON PIN .................................................................6-33INSTALLING THE PISTON AND CYLINDER ..........................................6-33ELECTRIC STARTER ....................................................................................6-35CHECKING THE STARTER MOTOR ......................................................6-37ASSEMBLING THE STARTER MOTOR..................................................6-38