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Yamaha YZ250F User Manual

Yamaha YZ250F
356 pages
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5
ENGINE
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....................................................................................................5-11
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...........................................................................................5-18
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 .....................................................................5-28
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

Table of Contents

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Yamaha YZ250F Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0 mm x 53.6 mm
Final DriveChain
Suspension / RearKYB® single shock; fully adjustable, 12.5-in travel
Brakes / FrontHydraulic single disc brake, 270mm
Brakes / RearHydraulic single disc brake, 240mm
Fuel Capacity1.6 gal
Engine TypeLiquid-cooled, DOHC, 4-stroke
Fuel DeliveryFuel injection
IgnitionTCI
Transmission5-speed; multiplate wet clutch
Suspension / FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Tires / Front80/100-21

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