Spark Plug Service - Honda GX22 Owner's Manual

3 Spark plug service

Recommended spark plug:
C5HSB, CR5HSB (NGK)
U16FS-UB, U16FSR-UB (DENSO}
CAUTION:
Never use a spark plug of incorrect heat range.
To ensure proper engine operation, the spark plug must be properly gapped and free of deposits.
1. Remove the spark plug cap and use the proper Size spark plug wrench to remove the spark plug.
! WARNING
If the engine has been running, the muffler will be very hot. Be careful not to t ouch the muffler.
2. Visually inspect the spark plug. Discard the spark plug if there is apparent wear, or if the insulator
is cracked or chipped. Clean the spark plug with a wire brush if it is to be reused.
3. Measure the plug gap with a feeler gauge. Correct as necessary by bending the side electrode.
The gap should be:
0.60 - 0.70mm (0.024-0.028in)
4. Check that the spark plug washer is in good condition and thread the spark plug in by hand to
prevent cross-threading.
5. After the spark plug is seated, tighten with a spark plug wrench to compress the washer.
NOTE:
When installing a new spark plug, tighten 1/2 turn after the spark plug seats to compress the washer.
When reinstalling a used spark plug, tighten 1/8 -1/4 turn after the spark plug seats to compress the
washer.
CAUTION:
The spark plug must be securely tightened. An improperly tightened spark plug can become
very hot and may damage the engine.
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