32
4.
Remove the spark plug(s) and metal washer.
2
1
m–4757
Figure 40
1. Spark plug wire
2. Spark plug
Checking the Spark Plug
1.
Look at the center of the spark plug(s) (Fig. 41). 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.
Check the gap between the center and side electrodes
(Fig. 41). Bend the side electrode if the gap is not
correct (Fig. 41).
0.040 inch
2
3
1
(1.02 mm)
Figure 41
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
Installing the Spark Plug
(s)
1.
Install the spark plug(s) and metal washer. Make sure
the air gap is set correctly.
2.
Tighten the spark plug(s) to 20 ft-lb (27 N
⋅
m).
3.
Push the wire(s) onto the spark plug(s) (Fig. 40).
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. 42). 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
1
Figure 42
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.
