Spark Plug Service - Honda Outboard Motor BF9.9A/15A Owner's Manual

SERVICING YOUR HONDA OUTBOARD MOTOR
SPARK PLUG SERVICE
Recommended spark plugs:
BF9.9A: DR-5HS (NGK), XlGFSR-U (DENSO)
BF15A: DR-6HS (NGK), X20FSR-U (DENSO)
To ensure proper engine operation, the spark plugs must be properly gapped
and free of deposits.
1. Remove the engine cover.
2. Remove the spark plug caps.
3. Use the wrench supplied in the tool kit to remove the spark plugs.
SPARK PLUG CAP
SPARK PLUG WRENCH
4. Visually inspect the spark plugs. Discard the spark plugs if there is apparent
wear, or if the insulators are cracked or chipped. Clean the spark plugs with
a wire brush if they are to be reused.
5. Measure the plug gaps with a feeler gauge.
,Correct as necessary by carefully bending the side electrode.
The gaps should be:
0.024 - 0.028 in (0.60 - 0.70 mm)
0.024 - 0.026 in
(0.60 - 0.70 mm)
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