
64
Figure 19
2. Visually inspect the spark plug. Discard the spark plug if there is 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 side electrode. The gap
should be set to .02-.03 inches (0.60-0.80mm). See figure 20.
Figure 20
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, tighten1/8-to1/4-turn after the spark plug seats to compress the washer.
CAUTION!
The spark plug must be tightened securely. A loose spark plug can become very hot and
can damage the engine.
Cleaning the Engine
If the engine has been running. Allow it to cool for at least half an hour before cleaning. Periodically remove
dirt build-up from engine.
CAUTION!
Do not spray engine with water to clean because water could contaminate 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, causing damage.
WARNING!
Accumulation of debris around muffler could cause a fire. Inspect and clean before every
use.
△
WARNING
:
If any adjustments need to be made to the engine while the engine is running (e.g.