Spark Plug Service - Honda GX620 Owner's Manual

SPARK PLUG SERVICE

Recommended spark plugs:
Incorrect spark plugs can cause engine damage.
1. Disconnect the spark plug caps, and remove any dirt from around
the spark plug area.
2. Remove the spark plugs with a 13/16-inch spark plug wrench.
SPARK PLUG CAP
3. Inspect the spark plugs. Replace
them if the electrodes are worn, or if
the insulator is cracked or chipped.
Clean the spark plugs with a wire
brush if you are going to reuse them.
4. Measure the spark plug electrode
gap with a wire-type feeler gauge.
Correct the gap, if necessary, by
carefully bending the side electrode.
0.012 0.016 in (0.3 0.4 mm)
5. Install the spark plug carefully, by
hand, to avoid cross-threading.
SERVICING YOUR ENGINE
ZGR5A-4 (NGK)
SIDE ELECTRODE
SPARK PLUG
WRENCH
0.012 0.016 in
(0.3 0.4 mm)
SEALING
WASHER
25