Spark Plug Service - Honda Car engines GX640 Owner's Manual

SPARK PLUG SERVICE
Recommended spark plugs: BPRSES-11 (NGK)
WlGEPR-Ull (DENSO)
Incorrect spark plugs can cause engine damage.
To ensure proper engine operation, the spark plugs must be properly
gapped and free of deposits.
1. Remove the spark plug caps.
2. Clean any dirt from around each spark plug base.
3. Use the proper size plug wrench to remove the spark plugs.
m
The muffler becomes very hot during operation and remains hot for a
while after stopping the engine. Be careful not to touch the muffler while it
is hot.
4.
5.
Vi! xally inspect the spark plugs. Discard them if the insulator is
cracked or chipped. Clean the spark plugs with a wire brush if they are
to be reused.
.
WRENCH
Measure the plug gap with a feeler gauge. Correct as necessary by
carefully bending the side electrode. 1 .c - 1.1 mm
The gap should be:
1 .O - 1 .l mm (0.039 - 0.043 in)
(0.039 - 0.043 in)
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