Spark Plug Service - Honda WT40 Owner's Manual

SERVICING YOUR PUMP

SPARK PLUG SERVICE

In order to service the spark plug, you will need a spark plug wrench
(commercially available).
Recommended spark plug: BPR6ES (NGK)
Incorrect spark plugs can cause engine damage.
For good performance, the spark plug must be properly gapped and free of
deposits.
Allow the engine to cool before servicing the spark plug.
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 CAP
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.
Correct the gap, if necessary, by
carefully bending the side electrode.
The gap should be:
0.028–0.031 in (0.7–0.8 mm)
36
W20EPR-U (DENSO)
SIDE ELECTRODE
SPARK PLUG WRENCH
0.028–0.031 in
(0.7–0.8 mm)
SEALING WASHER
INSULATOR