3. INSPECTION/ADJUSTMENT SUPER8 50 Timing Hole Cap IGNITION TIMING The CDI unit is not adjustable. If the ignition timing is incorrect, check the ignition system. ( 15-5) Remove the right of the fan cover. Timing Light Check the ignition timing with a timing light. When the engine is running at idle speed, the ignition timing is correct if the "F" mark on the flywheel aligns with the index mark on the crankcase. Also use a timing light to check the advance. Raise the engine speed to 4,000rpm and the index mark on the crankcase cover should be aligned with the advance mark on the flywheel. CYLINDER COMPRESSION Warm up the engine before compression test. Remove the met-in box and center cover. ( 2-3) Remove the spark plug. Insert a compression gauge. Open the throttle valve fully and push the starter button to test the compression. "F" Mark Advance Mark Compression Gauge Compression: 16kg/cm2rpm If the compression is low, check for the following: Leaky valves Valve clearance to small Leaking cylinder head gasket Worn piston rings Worn piston/cylinder If the compression is high, it indicates that carbon deposits have accumulated on the combustion chamber and the piston head. 3-6