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SERVICING YOUR OUTBOARD MOTOR
New plug
Plug needing
replacement
4.
Inspect the spark plugs. Replace
them if the electrodes are worn, or
if the insulators are cracked or
chipped.
78
SIDE ELECTRODE
0.024
0.028 in
(0.6
0.7 mm)
SEALING WASHER
INSULATOR
Measure the spark plug electrode
5.
gap with a wire-type feeler gauge.
Correct the gap, if necessary, by
carefully bending the side
electrode.
The gap should be:
0.024 0.028 in (0.6 0.7 mm)
SPARK PLUG
6.
Install the spark plugs carefully,
by hand, to avoid cross-threading.
7.
After each spark plug seats, tighten
with a spark plug wrench to
compress the sealing washer.
If reinstalling used spark plugs,
tighten 1/8 1/4 turn after the
spark plugs seat.
If installing new spark plugs,
tighten 1/2 turn after the spark
plugs seat.
Loose spark plugs can overheat
and damage the engine.
Overtightening the spark plugs
can damage the threads in the
cylinder head.
8.
Attach the spark plug caps.
9.
Install and lock the engine cover.
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