Spark Arrester - Honda HHT25S Owner's Manual

Spark Arrester

The spark arrester must be serviced every 100 hours to keep it
functioning as designed.
Your trimmer engine is factory-equipped with a spark arrester. In
some areas, it is illegal to operate an engine without a spark arrester.
Check local laws and regulations.
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.
2. Remove the two 4 x 6 mm self-tapping screws from the spark
arrester, and remove the spark arrester from the muffler.
SPARK
ARRESTER
4 x 6 mm
SELF-TAPPING
SCREWS
3. Use a brush to remove carbon deposits from the spark arrester
screen. Be careful to avoid damaging the screen.
The spark arrester must be free of breaks and holes. Replace the
spark arrester if it is damaged.
4. Install the spark arrester, top cover, and 5 x 12 mm hex bolt and
tighten securely.
18
5/32 in (4 mm) HEX WRENCH
(commercially available)
5 x 12 mm
HEX BOLT
TOP COVER
MUFFLER
MUFFLER
Cooling Fin Inspection
Inspect the engine
cooling fins every 50
COOLING
FINS
hours of operation. You
should clean out any
dirt and debris if air is
obstructed from flowing
across the cooling fins.
1. Loosen the 5 mm
hex bolt, then
remove the fan
cover.
2. Remove all dirt
and debris from
the cooling fins.
3. Install the fan
cover, and tighten the 5 mm hex bolt securely.
Throttle Cable Inspection
Verify the throttle trigger operates smoothly, releases properly, and
the throttle cable is undamaged. If there is visible damage, or if the
throttle lever does not operate smoothly or release properly, take your
trimmer to your authorized Honda servicing dealer.
Check the freeplay at the end of the throttle lever.
If adjustment is needed, see the Throttle Cable Adjustment
procedure.
Throttle Cable Adjustment
1. Loosen the
locknut with a
10 mm wrench,
and move the
adjuster in or out
as required.
CABLE END
Throttle Lever
Freeplay:
1/16 ~ 1/8 in
(1.0 ~ 3.0 mm)
(1.0 ~ 3.0 mm)
2. Tighten the
locknut and
recheck throttle
lever freeplay.
Carburetor
Adjustment
A tachometer is
required to adjust the
idle speed. If you do
not have one, take
your trimmer to an
authorized Honda servicing dealer to perform idle speed adjustment.
1. Start the engine outdoors, and allow it to warm up to normal
operating temperature.
2. Turn the throttle stop screw to obtain a stable idle, below the
speed at which the trimmer head begins to turn.
Standard Idle Speed: 3,100 ± 200 rpm
FREE PLAY
1/16 ~ 1/8 in
LOCK NUT
ADJUSTING
NUT