Spark Plug Service - Honda GX120 Owner's Manual

SERVICING YOUR ENGINE

SPARK PLUG SERVICE

Recommended spark plugs:
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.
3. Inspect the spark plug. Replace it
if the electrodes are worn, or if the
insulator is cracked or chipped.
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
(0.70 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.
34
BPR6ES
W20EPR-U
SPARK PLUG WRENCH
− 0.031 i n
(NGK)
(DENSO)
0.028 0.031 in −
(0.70 0.80 mm) −