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3. Disconnect the wires from the spark plugs
(Figure 40).
Figure 40
1. Spark-plug wire/spark plug
4. Clean around the spark plugs to prevent dirt
from falling into the engine and potentially
causing damage.
5. Remove the spark plugs and the metal washers.
Checking the Spark Plugs
1. Look at the center of the spark plugs
(Figure 41). If you see light brown or gray on
the insulator, the engine is operating properly.
A black coating on the insulator usually means
that the air cleaner is dirty.
2. If needed, clean the spark plug with a wire
brush to remove carbon deposits.
Figure 41
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
Important: Always replace the spark
plugs when it has a black coating, worn
electrodes, an oily film, or cracks.
3. Check the gap between the center and side
electrodes (Figure 41). Bend the side electrode
(Figure 41) if the gap is not correct.
Installing the Spark Plugs
1. Install the spark plugs and the metal washer.
Ensure that the air gap is set correctly.
2. Tighten the spark plugs to 16 ft-lb (22 N⋅m).
3. Connect the wires to the spark plugs
(Figure 41).
Fuel System
Maintenance
Servicing the Fuel Tank
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.
Draining the Fuel Tank
1. Park the machine on a level surface, to assure
fuel tank drains completely. Then disengage
the power take off (PTO), set the parking
brake, and turn the ignition key to off. Remove
the key.
2. Close the fuel shut-off valve at the fuel tank
(Figure 42).
3. Squeeze the ends of the hose clamp together
and slide it up the fuel line away from fuel filter
(Figure 42).
38
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