HONDA HHT35S - Manual (Page 19)

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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.
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.
2. Remove the two 4 x 6 mm self-tapping screws from the spark
arrester, and remove the spark arrester from the muffler.
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.
CUTTING ATTACHMENTS
There are several cutting attachments for your trimmer. Use the
following section to inspect, remove, service and install a standard
(factory-installed) cutting attachment.
Always move the engine switch to the STOP (O) position and
disconnect the spark plug cap before performing any inspection,
adjustment, or maintenance on the trimmer.
Cutting-Line Heads
All Honda trimmers come with either a manual or semi-matic cutting
head. Read this section to learn how to inspect, install new line, and
remove and install a cutting head from the trimmer.
Inspection
Make sure the nylon line is only sticking out of the metal eyelets on
the head. If any of the line has come off the spool, follow the Installing
Replacement Nylon Line instructions in this section to disassemble
the spool and replace the line.
Examine the entire head area, including the debris shield, and clear or
clean it free from dirt, debris, loose string, wire, or any other foreign
materials.
For the manual feed head, make sure the three-sided knob is
correctly tightened (page 21). For the semi-matic head, verify the
spool is locked in place (page 22). For both head styles, check for any
cracks in the plastic and replace any damaged parts.
SEALING
WASHER
SIDE ELECTRODE
0.024 ~ 0.028 in
(0.60 ~ 0.70 mm)
GAP
5/32 in (4 mm) HEX WRENCH
(commercially available)
TOP COVER
5 x 12 mm
HEX BOLT
MUFFLER
SPARK
ARRESTER
MUFFLER
4 x 6 mm
SELF-TAPPING
SCREWS
SPARK ARRESTER SCREEN