7-15
Spark Plug Cleaning
To maintain a hot, strong spark,
keep the plugs free from carbon.
Adjust the gap to 0.7 – 0.8 mm
(0.028 – 0.031 in) for good igni-
tion. Use a thickness (feeler)
gauge to check the gap.
Installation
To install a spark plug, turn it in as
far as possible with your fingers,
then tighten it with a wrench.
Carefully turn the spark plug by
hand into the threads until it is fin-
ger tight. If the spark plug is new,
tighten it with a wrench about 1/2
turn past finger tight. If you are
reusing the old spark plug, tighten
it with a wrench about 1/8 turn
past finger tight.
0.7 – 0.8 mm
(0.028 – 0.031 in)
CAUTION
A crossthreaded or overtight-
ened spark plug will damage
the aluminum threads of the
cylinder head.
Follow the procedure below to
tighten the spark plug properly.
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