Honda HHT25S Owner's Manual page 16

Free play: 1/16 ~ 1/8 in (1.0 ~ 3.0 mm)
If adjustment is needed, use the following cable adjustment
procedure.
CABLE END
FREE PLAY
1/16 ~ 1/8 in
(1.0 ~ 3.0 mm)
Throttle Cable Adjustment
1. Loosen the lock nut with a 10 mm wrench, and turn the adjusting
nut as required.
• Turn the adjusting nut left for more free play.
• Turn the adjusting nut right for less free play.
2. Tighten the lock nut and recheck cable free play.
Spark Plug Service
Recommended spark plug: CMR5HSB (NGK)
NOTICE
Incorrect spark plugs can cause engine damage.
1. Remove the 5 x 12 mm hex bolt and top cover.
5/32 in (4 mm)
HEX WRENCH
(commercially available)
5 x 12 mm
HEX BOLT
SPARK PLUG
SPARK PLUG
CAP
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 or chipped.
16
LOCK NUT
ADJUSTING
NUT
TOP
COVER
5. Measure the spark plug electrode gap with a suitable gauge. The
gap should be
0.024 ~ 0.028 in (0.60 ~ 0.70 mm). Correct the gap, if necessary,
by carefully bending the side electrode.
SIDE ELECTRODE
SEALING
WASHER
6. Install the spark plug carefully, by hand, to avoid cross-threading.
7. 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.
Overtightening the spark plug can damage the threads in the
cylinder head.
8. Attach the spark plug cap.
9. Install the top cover and 5 x 12 mm hex bolt and tighten securely.
Spark Arrester Service
The spark arrester must be serviced every 100 hours to keep it
functioning as designed.
If the engine has been running, the muffler will be very hot. Allow the
muffler to cool before servicing the spark arrester.
1. Remove the 5 x 12 mm hex bolt and top cover.
GAP
0.024 ~ 0.028 in
(0.60 ~ 0.70 mm)
5/32 in (4 mm) HEX WRENCH
(commercially available)
5 x 12 mm
HEX BOLT
TOP COVER
MUFFLER