HONDA Outboard Motor BF150A - Manual (Page 71)

69
SERVICING YOUR OUTBOARD MOTOR
SPARK PLUG
WRENCH
19 mm EYE
WRENCH
0.039 0.051 in
(1.00 1.30 mm)
SEALING
WASHER
Loose spark plugs can overheat
and damage the engine.
Overtightening the spark plugs
can damage the threads in the
cylinder head.
Do not strike or drop the ignition
coil, or it may be damaged and
require replacement.
Install the spark plugs carefully,
by hand, to avoid cross-threading.
After each spark plug seats, tighten
with a spark plug wrench supplied
in the tool kit 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. Inspect the spark plugs. Replace
them if the electrodes are worn, or
if the insulators are cracked or
chipped.
Measure the spark plug electrode
gap with a wire-type feeler gauge.
The gap should be 0.039
0.051
inches (1.00 1.30 mm). If the
gap is out of the specification,
replace the plug with a new one.
Never try to readjust the gap.
Remove the ignition coil by
pulling it up slightly.
Remove the spark plugs with a
spark plug wrench and 19 mm eye
wrench. 9.
11.
10.
13.
12. 8.
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