2001 Arctic Cat ATVs factory service and repair manual, Page 313Get this manual
VOLTAGE (Brakelight) NOTE: Perform this test on the main harness side of the connectorAlso, the ignition switch should be in the ON position and the brake (either foot pedal or hand lever) must be appliedNOTE: Make sure the brake lever (hand) and brake pedal (foot) are properly adjusted for this procedure 1Attach the engine Timing Light (pn 0644-197) to the spark plug high tension lead; then remove the timing inspection plug from the left-side crankcase cover2With the Arctic Cat Engine Tachometer (pn 0644-275) connected, start the engine and run at the specified RPM3I gnit ion ti mi ng should be according to specificationsModel 250 cc 300 cc 400500 cc Timing BTDC below 1800 RPM 35 BTDC above 3800 RPM BTDC 1800 RPM 30 BTDC 3800 RPM 10 BTDC 1500 RPM