Honda WX15T Owner's Manual page 40

SERVICING YOUR PUMP
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:
0.024–0.028 in (0.6–0.7 mm)
5.Install the spark plug carefully, by
hand, to avoid cross-threading.
6.After the spark plug seats, tighten with a spark plug wrench to
compress the washer.
If reinstalling the used spark plug, tighten 1/8–1/4 turn after the
spark plug seats.
If installing a new spark plug, tighten 1/2 turn after the spark plug
seats.
A loose spark plug can overheat and damage the engine.
Overtightening the spark plug can damage the threads in the cylinder
head.
7.Attach the spark plug cap.
38
0.024–0.028 in
(0.6–0.7 mm)
SEALING
WASHER
INSULATOR