Honda HHT25S Owner's Manual page 16

Throttle Cable Inspection
Verify the throttle trigger operates smoothly and the throttle cable is
undamaged. If there is visible damage, or if the throttle trigger does
not operate smoothly, have your authorized Honda servicing dealer
replace the throttle cable.
Check the free play at the end of the throttle cable.
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.
16
LOCK NUT
ADJUSTING
NUT
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.
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.
TOP
COVER
GAP
0.024 ~ 0.028 in
(0.60 ~ 0.70 mm)