Yamaha WR250F Owner's Service Manual

Also see for wr250f: Owner's service manual Owner's service manual Owner's service manual Owner's service manual Owner's service manual

Contents

ELECTRICAL SYSTEM3-39EAS2GB2132ELECTRICAL SYSTEMEAS2GB2133CHECKING THE SPARK PLUG1. Remove:• Seat• Air scoop (left/right)Refer to “GENERAL CHASSIS” on page 5-1.• Fuel tank “1”Refer to “FUEL TANK” on page 8-1.ECANOTICEDo not use too much force to pull the hose.TIPRemove the fuel tank, turn this 180 ° clockwise,and put it in the frame “2” as shown.2. Remove:• Spark plug cap• Spark plugRefer to “CAMSHAFT” on page 6-11.ECANOTICEIn order not to allow the dirt accumulatedaround the spark plug to drop from thespark plug hole into the cylinder, clean it be-fore removing the spark plug.3. Check:• Spark plug typeWrong type  Replace.4. Check:• ElectrodeDamage/wear  Replace the spark plug.• InsulatorAbnormal color  Replace the spark plug.Normal color is medium-to-light tan.5. Clean:• Spark plug(with a spark plug cleaner or a wire brush)6. Measure:• Spark plug gap “a”Out of specification  Adjust the spark pluggap.7. Install:• Spark plugTIPBefore installing the spark plug, clean the sparkplug and gasket surface.8. Install:• Spark plug cap• Fuel tank• Air scoop (left/right)• Seat• Side cover (left/right)Refer to “GENERAL CHASSIS” on page 5-1.EAS2GB2134CHECKING THE IGNITION TIMING1. Remove:• Timing mark accessing screw “1”Manufacturer/modelNGK/LMAR8G112Spark plug gap0.7–0.8 mm (0.028–0.031 in)Spark plug13 Nm (1.3 m·kgf, 9.4 ft·lbf)T R..1