83
SERVICING YOUR OUTBOARD MOTOR
Spark Plug Service
RECOMMENDED SPARK PLUGS:
CR5EH-9 (NGK)
U16FER9 (DENSO)
Incorrect spark plugs can cause
engine damage.
1. Unlatch and remove the engine
cover (p. 74).
2. Disconnect the spark plug caps
from the spark plugs.
3. Remove the spark plugs with a
spark plug wrench and handle.
4. Inspect the spark plugs. Replace
them if the electrodes are worn, or
if the insulators are cracked or
chipped.
5. Measure the spark plug electrode
gap with a wire-type feeler gauge.
Correct the gap, if necessary, by
carefully bending the side
electrode.
The gap should be:
0.031 – 0.035 in (0.8 – 0.9 mm)
SPARK PLUG
WRENCH
SPARK PLUG CAP
New plug Plug needing
replacement
SIDE ELECTRODE
0.031 – 0.035 in
(0.8 – 0.9 mm)
SEALING
WAS HER
INSULATOR
31ZY06520.book Page 83 Friday, October 13, 2023 1:58 PM
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