Spark Plug Service - Honda EM3500SX Owner's Manual

SPARK PLUG SERVICE

In order to service the spark plug, you will need a spark plug wrench
(commercially available).
Recommended spark plugs:
To ensure proper engine operation, the spark plug must be properly
gapped and free of deposits.
If the engine has been running, the muffler will be very hot. Be careful
not to touch the muffler.
1. Remove the spark plug cap.
2. Clean any dirt from around the spark plug base.
3. Use a spark plug wrench to remove the spark plug.
PLUG CAP
4. Visually inspect the spark plug. Discard it if the insulator is cracked
or chipped. Clean the spark plug with a wire brush if it is to be
reused.
5. Measure the plug gap with a feeler gauge.
Correct as necessary by carefully bending the side electrode.
The gap should be:
BPR5ES (NGK)
W16EPR-U (DENSO)
PLUG WRENCH
0.028 0.031 in (0.70 0.80 mm)
0.028 0.031 in (0.70 0.80 mm)
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