Honda HHT25S Manual page 40

HHT25S•HHT35S
9. SPARK PLUG SERVICE
Standard spark plug
NOTICE
An incorrect spark plug can cause engine damage.
If the engine has been running, it will be very hot. Allow the
engine to cool before proceeding.
1. Loosen the 5 mm top cover bolt, and then remove the cover.
2. Disconnect the spark plug cap, and remove any dirt from
around the spark plug area.
3. Remove the spark plug with a 5/8-inch spark plug wrench.
4. Inspect the spark plug. Replace it if the electrodes are worn, or
if the insulator is cracked, chipped, or fouled.
5. Measure the spark plug electrode gap with a suitable gauge.
Spark plug gap 0.60 ~ 0.70 mm (0.024 ~ 0.028 in)
6. Correct the gap, if necessary, by carefully bending the side
electrode.
7. Make sure the sealing washer is attached, and install the spark
plug carefully, by hand, to avoid cross-threading.
8. After the spark plug seats, tighten with a 5/8-inch 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.
NOTICE
A loose spark plug can overheat and damage the engine.
Over-tightening the spark plug can damage the threads in the cylinder head.
9. Attach the spark plug cap.
10. Install the top cover and tighten the 5 mm hex bolt securely
NGK – CMR5H
.
SPARK PLUG WRENCH
SIDE
ELECTRODE
MAINTENANCE
0.60 ~ 0.70 mm
(0.024 ~ 0.028 in)
SEALING
WASHER
3-11