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Removing the Spark Plug
1. Disengage the PTO, turn the ignition key to off, and
remove the key.
2. Wait for all moving parts to stop before leaving the
operating position and then chock or block tires.
3. Disconnect the wires from the spark plugs (Fig. 41).
Figure 41
1. Spark-plug (2)
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 (Fig. 42). 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
1
Figure 42
1. Center electrode insulator
2. Side electrode
Important
Never clean the spark plugs. Always replace
the spark plugs when it has a black coating, worn
electrodes, an oily film, or cracks.
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3
0.030 in.
(0.75 mm)
3. Air gap (not to scale)
33
2. Check the gap between the center and side electrodes
(Fig. 42). Bend the side electrode (Fig. 42) if the gap is
not correct.
Installing the Spark Plug
1. Install the spark plugs and the metal washer. Ensure that
the air gap is set correctly.
2. Tighten the spark plugs to 11 ft.-lb. (15 N.m).
3. Connect the wires to the spark plugs (Fig. 41).
Checking the Tire Pressure
Service Interval/Specification
Maintain the air pressure in the front and rear tires as
specified. Check the pressure at the valve stem after every
50 operating hours or monthly, whichever occurs first
(Fig. 43). Check the tires when they are cold to get the most
accurate pressure reading.
Pressure: 15 psi (103 kPa) rear tires
25–30 psi (172–207 kPa) caster tires
Figure 43
1. Valve stem
Cleaning the Cooling System
Service Interval/Specification
Before each use, check and clean engine cooling system.
Remove any buildup of grass, dirt or other debris from the
cylinder and cylinder head cooling fins, air intake screen on
flywheel end, and carburetor-governor levers and linkage.
This will help insure adequate cooling and correct engine
speed and will reduce the possibility of overheating and
mechanical damage to the engine.
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