1987-2003 Yamaha YFZ350 Banshee supplementary service manual, Page 101Get this manual
IGNITION TIMING CHECK SPARK PLUG INSPECTION 4Check: Ignition timing
Ignition timing check steps: Connect Timing Light (D (YM-33277) to the the spark plug leadWarm up the engine and let it idle at the specified idle speed of 1,450 1,550 rlminVisually check the stationary pointer (2) on the crankcase to verify it is within the firing range (3) indicated on the flywheelIncorrectCheck flywheel andor pick-up assembly (tightness andor damage)Refer to "CHAPTER 7ELECTRICAL" for further information-
5Install: Crankcase cover (Left)