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tool/feeler gauge to check and adjust the air gap.
Install a new spark plug(s) if necessary.
• Type: NGK
®
BPR4ES or equivalent
• Air Gap: 0.030 inch (0.75 mm)
Removing the Spark Plug
1. Disengage the PTO, move the motion control
levers to the neutral locked position and set
the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Pull the wire(s) off the spark plug(s) (Figure 41).
Now clean around the spark plug(s) to prevent
dirt from falling into the engine and potentially
causing damage.
4. Remove the spark plug(s) and metal washer.
Figure 41
1. Spark plug wire
Checking the Spark Plug
1. Look at the center of the spark plug(s)
(Figure 42). If you see light brown or gray on
the insulator, the engine is operating properly.
A black coating on the insulator usually means
the air cleaner is dirty.
Important: Never clean the spark
plug(s). Always replace the spark plug(s)
when it has: a black coating, worn
electrodes, an oily film, or cracks.
2. Spark plug
Figure 42
1. Canter electrode insulator
2. Side electrode
2. Check the gap between the center and side
electrodes (Figure 42). Bend the side electrode
(Figure 42) if the gap is not correct.
Installing the Spark Plug
1. Install the spark plug(s). Make sure the air gap
is set correctly.
2. Tighten the spark plug(s) to 16 ft.-lb (22 N⋅m).
3. Push the wire(s) onto the spark plug(s)
(Figure 41).
Fuel System
Maintenance
Replacing the Fuel Filter
Replace the fuel filter after every 200 operating
hours or yearly, whichever occurs first.
Never install a dirty filter if it is removed from the
fuel line.
1. Disengage the PTO, move the motion control
levers to the neutral locked position, and set
the parking brake.
2. Stop the engine, remove the key, and wait for
all moving parts to stop before leaving the
operating position.
3. Allow the machine to cool down.
4. Close the fuel shutoff valve (Figure 43).
36
3. Air gap (not to scale)
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