2002 Yamaha YFM660 Grizzly factory service and repair manual, Page 100Get this manual
CHECKING THE IGNITION TIMING
CHECKING THE IGNITION TIMING NOTE: Engine idling speed and throttle cable free play should be adjusted properly before checking the ignition timing1.Remove: Seat Fuel tank side panel (left) Engine side cover Refer to "SEAT, CARRIERS, FENDERS AND FUEL TANK"2.Attach: Tachometer Timing light (to the spark plug lead) Inductive tachometer: PNYU-8036-A Engine tachometer: PN90890-03113 Timing light: PNYM-33277-A, 90890-03141 3.Check: Ignition timing Checking steps: Warm up the engine and keep it at the specified speedEngine speed: 1,4501,550 rmin the recoil starter 1the timing plug 2check the stationary pointer to verify it is within the required firing range indicated on the flywheelIncorrect firing range Check the pulser coil assemblyInstall the timing plugInstall the recoil starter Remove Remove Visually