Spark Plug Service - Honda Marine BF8D Owner's Manual

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.
82
SPARK PLUG SPARK PLUG CAP
WRENCH
4. Inspect the spark plugs. Replace
them if the electrodes are worn, or
if the insulators are cracked or
chipped.
SIDE ELECTRODE
0.031
(0.8
SEALING
WASHER
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)
0.035 in
0.9 mm)