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Figure 36
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. 37). 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 37
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.
2. Check the gap between the center and side electrodes
(Fig. 37). Bend the side electrode (Fig. 37) if the gap is
not correct.
m–7453
3
0.030 inch
(0.75 mm)
3. Air gap (not to scale)
31
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. 36).
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. 38). 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 38
1. Valve
stem
Cleaning the Cooling System
Clean the air intake screen from grass and debris before
each use.
Clean cooling fins and engine shrouds every 100 hours or
yearly, which ever comes first.
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. Remove the air intake screen, recoil starter and fan
housing.
4. Clean the debris and grass from the engine parts.
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