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6. Fill the crankcase with the proper type of new engine
oil; refer to Checking the Engine Oil Level.
Servicing the Spark Plug
Service Interval: Every 25 hours—Check the spark plug.
Every 100 hours—Replace the spark plug.
Use a Champion RC12YC or equivalent spark plug.
Ensure that the air gap between the center and side electrodes
is 0.030 inch (0.76 mm) before installing the spark plug. Use
a spark plug wrench for removing and installing the spark
plug and a gapping tool or feeler gauge to check and adjust
the air gap.
Removing the Spark Plug
1. Disengage the blades (PTO).
2. Set the parking brake.
3. Stop the engine and wait for all moving parts to stop.
4. Remove the ignition key.
5. Open the hood.
6. Disconnect the wire from the spark plug (Figure 28).
1
2
Figure 28
1. Spark plug
2. Spark plug wire
7. Clean around the spark plug to prevent dirt from falling
into the engine and potentially causing damage.
8. Remove the spark plug and the metal washer
(Figure 28).
Checking the Spark Plug
1. Look at the center of the spark plug (Figure 29). 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.
3
G012457
3. Front of engine
1. Center electrode insulator
2. Side electrode
Important: Do not clean the spark plug. Always
replace the spark plug when it has a black coating,
worn electrodes, an oily film, or cracks.
2. Check the gap between the center and side electrodes
(Figure 29) and bend the side electrode if the gap is
not correct.
Installing the Spark Plug
1. Install the spark plug and metal washer. Ensure that
the air gap is set correctly.
2. Tighten the spark plug to 15 ft-lb (20.4 N-m).
3. Connect the wire to the spark plug (Figure 28).
4. Close the hood.
23
Figure 29
3. Air gap (not to scale)
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