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A loose spark plug can overheat and damage the engine. Over- tightening the
spark plug can damage the threads in the cylinder head.
1. Use a spark plug wrench to remove the spark plug.
2. Inspect the spark plug each time you change the oil. The
electrodes should be kept clean and free of carbon. The
presence of carbon or excess oil will reduce proper engine
performance. If possible, check the spark plug gap (area
between electrodes) using a wire feeler gauge.
3. Install the spark plug carefully to avoid cross threading.
Screw in spark plug by hand until it stops turning.
4. Tighten the spark plug with a 13/16-inch (20.6 mm) spark
plug wrench. Tighten 1/4 turn after the spark plug seats.
It is advisable to replace the spark plug at least once a year to insure easy
VALVE ADJUSTMENT PROCEDURE
In order to properly set the valves, the engine must be at TDC on the
compression stroke. To find TDC on the compression stroke, roll the engine
over until the intake valve closes and stops at TDC.
INTAKE VALVE CLEARANCE ADJUSTMENT
1. Remove the valve cover and secondary air pipe assembly.
2. Verify cam lobes are pointed down.
3. Insert correct thickness feeler gauge between end of intake valve stem and
adjuster screw.
4. When clearance is correct, hold adjuster screw and tighten locknut securely.
NOTICE
NOTE
starting and good engine performance.
NOTE
MAINTENANCE
51
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