Spark Plug - Troy-Bilt 2690 Operating Manual

6. Reinstall the oil filler cap/dipstick securely.
CAUTION!
Thoroughly wash your hands with soap
and water as soon as possible after handling
used oil.
NOTE:
Please dispose of used motor oil in a manner that is
friendly to the environment. Take it to a recyling center or other
collection center.

Spark Plug

WARNING!
DO NOT check for a spark with the
spark plug removed. DO NOT crank the engine with
the spark plug removed.
WARNING!
If the engine has been running, the
muffler will be very hot. Be careful not to touch the
muffler.
To ensure proper engine operation, the spark plug must be
properly gapped and free of deposits.
1. Remove the spark plug boot and use a spark plug wrench
to remove the plug, Fig. 7-3.
Spark Plug
Figure 7-3
2. Visually inspect the spark plug. Discard the spark plug if
there is any apparent wear, or if the insulator is cracked or
chipped. Clean the spark plug with a wire brush if it is to be
reused.
3. Measure the plug gap with a feeler gauge. Correct as
necessary by bending the side electrode, Fig. 7-4. The gap
should be set to .02-.03 inches (0.60-0.80 mm).
Electrode
4. Check that the spark plug washer is in good condition
and thread the spark plug in by hand to prevent cross-
threading.
5. After the spark plug is seated, tighten with a spark plug
wrench to compress the washer.
NOTE: When installing a new spark plug, tighten 1⁄2-turn
after the spark plug seats to compress the washer. When
reinstalling a used spark plug, tighten 1⁄8- to 1⁄4-turn after
the spark plug seats to compress the washer.
Cleaning the Engine
If the engine has been running, allow it to cool for at least a half
an hour before cleaning. Periodically remove dirt build-up from
engine.
Spark Plug Boot
.02-.03 in.
(0.60-0.80 mm)
Figure 7-4
CAUTION!
The spark plug must be tightened
securely. A loose spark plug can become very hot
and can damage the engine.
CAUTION!
Do not spray the engine with water to
clean it because the water could contaminate the
fuel. Using a garden hose or pressure washing
equipment can also force water into the muffler
opening. Water that passes through the muffler can
enter the cylinder and cause damage.
WARNING!
Accumulation of debris around the
muffler could cause a fire. Inspect and clean before
every use.
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ectiOn ngine
M 21
aintenance