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5. Install the cover orienting the rubber outlet valve in
a downward position - between approximately 5:00
to 7:00 when viewed from the end.
6. Secure the latches.
Replacing the Spark Plugs
Service Interval: Every 800 hours
Replace the spark plugs after every 800 operating hours
or yearly, whichever occurs first.
Type: Champion RC12YC (or equivalent)
Air Gap: 0.030 in. (0.76 mm)
Note: The spark plug usually lasts a long time; however,
the plug should be removed and checked whenever the
engine malfunctions.
1. Clean the area around the spark plugs so that foreign
matter cannot fall into the cylinder when the spark
plug is removed.
2. Pull the spark plug wires off of the spark plugs and
remove the plugs from the cylinder head.
3. Check the condition of the side electrode, center
electrode, and center electrode insulator to ensure
that there is no damage.
Important: A cracked, fouled, dirty, or
otherwise malfunctioning spark plug must be
replaced. Do not sand-blast, scrape, or clean
the electrodes by using a wire brush because
grit may eventually release from the plug and
fall into the cylinder. The result is usually a
damaged engine.
4. Set the air gap between the center and side of the
electrodes at 0.030 in. (0.76 mm) (Figure 18). Install
the correctly gapped spark plug with gasket seal, and
tighten the plug to 200 in-lb (23 N⋅m). If a torque
wrench is not used, tighten the plug firmly.
Figure 18
Cleaning the Cylinder Head
Fins
To avoid overheating and possible engine damage, the
cooling fins on the cylinder head must be kept clean.
24
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