3. LUBRICATION SYSTEM VITALITY 50 IGNITION APPARATUS Spark Plug Gap, Wear and Remove the frame center cover. Fouling Deposits 0.6-0.7mm Remove the spark plug cap and spark plug. Check the spark plug for wear, fouling and carbon deposits. Washer Damage Remove the fouling and carbon deposits with a spark plug cleaner or wire brush. Specified: Cracks 2-Stroke: NGK-BR8HSA 4-Stroke: NGK-C7HSA Spark Plug Gap: 0.60.7mm Ignition Apparatus Index Mark The CDI ignition timing is not adjust- able. If the timing is incorrect, check the CDI unit, ignition coil and A.C. generator and replace any faulty parts. Remove the A.C. generator fan cover. ( 8-3) Remove the four bolts from the fan and then remove the fan. ( 8-3) Warm up the engine and check the ignition timing with a timing light. F Mark When the engine is running at the specified rpm, the ignition timing is correct if the "F" mark on the flywheel aligns with the index mark on the crankcase within 2°. Ignition Timing: 2-stroke: 13.5°2°/3000rpm 4-stroke: 28°2°/4000rpm 3-15