31
Replacing the Spark Plugs
Replace the spark plugs after every 800 operating hours.
The recommended air gap is 0.030 in. (0.76 mm)
The correct spark plug to use is a Champion RC 14YC.
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 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 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) (Fig. 39) Install the
correctly gapped spark plug w/gasket seal, and tighten
the plug to 200 in.-lb. (23 N
⋅
m). If a torque wrench is
not used, tighten the plug firmly.
0.030 in.
(0.76 mm)
Figure 39
Replacing the Fuel Filter
An in-line filter is incorporated into the fuel line between
the fuel tank and carburetor (Fig. 40). Replace the filter
every 800 hours or sooner if the fuel flow is restricted. Be
sure the arrow on the filter is pointing away from the fuel
tank.
Danger
In certain conditions, gasoline is extremely
flammable and highly explosive. A fire or
explosion from gasoline can burn you and others
and can damage property.
•
Drain gasoline from the fuel tank when the
engine is cold. Do this outdoors in an open area.
Wipe up any gasoline that spills.
•
Never smoke when draining gasoline, and stay
away from an open flame or where a spark may
ignite the gasoline fumes.
1.
Close the fuel shut off valve, loosen the hose clamp on
the carburetor side of filter and remove the fuel line
from the filter (Fig. 40).
1
2
Figure 40
1. Fuel shut off valve
2. Fuel filter
2.
Place a drain pan under the filter, loosen the remaining
hose clamp and remove the filter (Fig. 40).
3.
Install the new filter with the arrow on the filter body
pointing away from the fuel tank.
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