Spark Plug Service - Honda GX120 Owner's Manual

SERVICING YOUR ENGINE
SPARK PLUG SERVICE
Recommended spark plugs: BPR6ES (NGK)
W20EPR-U (DENSO)
p G q
An incorrect spark plug can cause engine damage.
1. Disconnect the spark plug cap, and remove any dirt from around the
spark plug area.
2. Remove the spark plug with a 13/16-inch spark plug wrench.
SPARK PLUG WRENCH
3. Inspect the spark plug. Replace
it
0.028-0.031 in
if the electrodes are worn, or if the
(0.70-0.80 mm)
insulator is cracked or chipped.
Clean the spark plug with a wire
brush if you are going to reuse
it.
4. Measure the spark plug electrode
gap with a suitable gauge. The
g a p s h o u l d b e 0.028-0.031
i n
(0.70-0.80 mm). Correct the gap,
if necessary, by carefully bending
the side electrode.
5. Install the spark plug carefully, by
hand,
to avoid cross-threading.
36