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12- ENG
N003333
tightened spark plug can become very
hot and could damage the engine.
Never use spark plugs which have an
improper heat range. Use only the rec-
ommended spark plugs or equivalent.
Spark Arrester
WARNING: Risk of explosion or fire.
DO NOT operate engine without spark
arrestor (S).
WARNING: If the engine has been
running, the muffler will be very hot. To
reduce the risk of injury, allow engine
to cool before proceeding.
NOTE: The spark arrester must be ser-
viced every 100 hours to maintain its
efficiency.
1. Remove muffler cover (W).
W
2. Remove the spark arrestor screws
(X) and remove the spark arres-
tor (S).
X
X
X
S
3. Use brush to remove carbon
deposits from the spark arrester
screen. Inspect the spark arrester
screen for holes or tears. Replace
the spark arrester if necessary.
Spark Plug
Use recommended spark plugs, see
Specifications for correct spark plug.
To ensure proper engine operation, the
spark plug must be properly gapped
and free of deposits.
WARNING: If the engine has been
running, the muffler will be very hot. To
reduce the risk of injury, allow cooling
before proceeding.
1. Remove the spark plug cap.
2. Clean any dirt from around the
spark plug base.
3. Use a spark plug wrench (not sup-
plied) to remove the spark plug.
4. Visually inspect the spark plug.
Replace it if the insulator is
cracked or chipped. Clean the
spark plug with a wire brush if it is
going to be reused.
WARNING: Always wear certified
safety equipment: ANSI Z87.1 eye
protection (CAN/CSA Z94.3) with
side shields.
5. Measure the plug
V
gap with a feeler
gauge (V). Correct as
necessary by
carefully bending the
side electrode. The
gap should be:
0.70 –0.80 mm
(0.028 – 0.031 in).
6. Make sure the spark
plug washer is in good condition.
Thread the spark plug in by hand
to prevent cross threading.
7. After the spark plug is seated,
tighten with a spark plug wrench
to compress the washer. If install-
ing a new spark plug, tighten the
spark plug 1/2 turn after it seats
to compress the washer. If rein-
stalling a used spark plug, tighten
1/8–1/4 turn after the spark plug
seats to compress the washer. Do
not overtighten.
8. Securely replace spark plug cap.
NOTE: The spark plug must be
securely tightened. An improperly