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Yamaha YZ250FX 2019 User Manual

Yamaha YZ250FX 2019
398 pages
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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

Table of Contents

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Yamaha YZ250FX 2019 Specifications

General IconGeneral
Displacement250cc
Bore x Stroke77.0mm x 53.6mm
Fuel SystemYamaha Fuel Injection (YFI), Keihin® 44mm
IgnitionTCI: Transistor Controlled Ignition
Final DriveChain
Front BrakeHydraulic disc, 270mm
Rear BrakeHydraulic disc, 245mm
Seat Height37.6 in
Ground Clearance12.8 in
Fuel Capacity2.1 gal
Wet Weight249 lb
Engine TypeLiquid-cooled DOHC 4-stroke
TransmissionWide-ratio 6-speed; multiplate wet clutch
Front SuspensionKYB® spring-type fork, fully adjustable
Rear SuspensionKYB® single shock
L x W x H32.5 in
Front Tire90/90-21
Rear Tire110/100-18

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