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Yamaha YZ250F 2014 Service Manual

Yamaha YZ250F 2014
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TROUBLE SHOOTING
9-1
EAS1SM1350
TROUBLE SHOOTING
EAS1SM1351
GENERAL INFORMATION
TIP
The following guide for troubleshooting does
not cover all the possible causes of trouble. It
should be helpful, however, as a guide to basic
troubleshooting. Refer to the relative procedure
in this manual for checks, adjustments, and re-
placement of parts.
EAS1SM1352
STARTING FAILURES
Engine
1. Cylinder and cylinder head
Loose spark plug
Loose cylinder head or cylinder
Damaged cylinder head gasket
Damaged cylinder gasket
Worn or damaged cylinder
Incorrect valve clearance
Improperly sealed valve
Incorrect valve-to-valve-seat contact
Incorrect valve timing
Faulty valve spring
Seized valve
2. Piston and piston ring(s)
Improperly installed piston ring
Damaged, worn or fatigued piston ring
Seized piston ring
Seized or damaged piston
3. Air filter
Improperly installed air filter
Clogged air filter element
4. Crankcase and crankshaft
Improperly assembled crankcase
Seized crankshaft
Fuel system
1. Fuel tank
Empty fuel tank
Clogged fuel tank breather hose
Deteriorated or contaminated fuel
Clogged or damaged fuel hose
2. Fuel pump
Faulty fuel pump
3. Throttle body
Deteriorated or contaminated fuel
Sucked-in air
Electrical system
1. Spark plug
Incorrect spark plug gap
Incorrect spark plug heat range
Fouled spark plug
Worn or damaged electrode
Worn or damaged insulator
2. Ignition coil
Cracked or broken ignition coil body
Broken or shorted primary or secondary
coils
3. Ignition system
Faulty ECU
Faulty crankshaft position sensor
Broken generator rotor woodruff key
4. Switches and wiring
Faulty ECU
Faulty engine stop switch
Broken or shorted wiring
Faulty neutral switch
Improperly grounded circuit
Loose connections
EAS1SM1353
INCORRECT ENGINE IDLING SPEED
Engine
1. Cylinder and cylinder head
Incorrect valve clearance
Damaged valve train components
2. Air filter
Clogged air filter element
Fuel system
1. Throttle body
Damaged or loose throttle body joint
Improperly synchronized throttle bodies
Improper throttle cable free play
Flooded throttle body
Electrical system
1. Spark plug
Incorrect spark plug gap
Incorrect spark plug heat range
Fouled spark plug
Worn or damaged electrode
Worn or damaged insulator
Faulty spark plug cap
2. Ignition coil
Broken or shorted primary or secondary
coils
Cracked or broken ignition coil

Table of Contents

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Yamaha YZ250F 2014 Specifications

General IconGeneral
Engine TypeLiquid-cooled, 4-stroke, DOHC, 4-valve
Displacement250cc
Bore x Stroke77.0mm x 53.6mm
Compression Ratio13.5:1
Fuel DeliveryFuel Injection
IgnitionTCI
TransmissionConstant-mesh 5-speed; multiplate wet clutch
Final DriveChain
Suspension / FrontKYB® Speed-Sensitive System inverted fork; fully adjustable, 12.2-in travel
Brakes / FrontHydraulic single disc brake, 250mm
Brakes / RearHydraulic single disc brake, 245mm
Tires / Front80/100-21
Tires / Rear100/90-19
Seat Height38.0 in
Ground Clearance12.8 in
Fuel Capacity2.0 gal
Wet Weight231 lb
Suspension / RearKYB® Fully adjustable single shock; 12.4-in travel
Wheelbase58.3 in
Trail4.7 in

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