Removing or Replacing the Spark Plug
1. Before removing the spark plug clean any dirt
from around the spark plug base.
2. Carefully disconnect the spark plug wire cap.
Do not pull on the wire as this may damage the
conductor within the wire causing high resistance
and reduced ring voltage.
3. Remove the spark plug with a spark plug
wrench.
4. Inspect the spark plug electrodes for wear. The
center electrode (1) should have square edges.
The side electrodes (2) should not be eroded.
The insulator should not be cracked or chipped.
5. Check the spark plug gap (3), using a wire-type
feeler gauge. If an adjustment is necessary,
bend the side electrode carefully to open or close
the gap, which should be 0.024- to 0.028-in.
(0.60 to 0.70mm). Make sure the plug washer is
in good condition. If you need to install a new
spark plug check and, if necessary, adjust the
gap.
6. With the plug washer attached, thread the spark
plug in by hand (to prevent cross-threading).
Do not force-t the plug.
7. Tighten the spark plug about 1/8 to1/4 turn after
it seats, if the old plug is good, or about 1/2
turn after it seats if installing new plug.
NOTICE
Improperly tightened spark plugs can cause dam-
age to the engine. A loose plug can cause a burned
piston; over-tightening the plug can damage or strip
the threads in the cylinder head.
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