Honda H5518H Owner's Manual page 88

5. Spark plug
service
Recommended spark plug: BPRSES-11 (NGK)
WlGEPR-Ull (DENSO)
m
Touching a hot engine or exhaust system can cause serious
burns. Let the engine cool before performing maintenance.
m Spark plugs of the wrong heat range can cause engine damage.
For good performance, the spark plug must be properly gapped and free of
deposits.
1. Open the engine hood and remove the spark plug caps.
2. Clean any dirt from around the spark plug bases.
3. Use a spark plug wrench to remove the spark plugs.
v WRENCH
SP>K PLUG
4. Visually inspect the spark plugs. Discard the spark plugs if there is ap-
parent 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.
The gaps should be 1.0-1.1 mm (0.039-0.043 in). Correct as
necessary by carefully bending the side electrode.
1.0-1.1 mm
(0.039-0.043
inl
86