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11
Removing the Spark Plug
1. Disengage the blade control switch, move
the motion controls outward to the park
position, stop the engine, and remove the
key.
2. Pull the wire off of the spark plug
(Figure 29). Clean around the spark plug
to prevent dirt from falling into the engine
and potentially causing damage.
Note: Due to the deep recess around the
spark plug, blowing out the cavity with
compressed air is usually the most effective
method for cleaning. The spark plug is most
accessible when the blower housing is
removed for cleaning.
3. Remove the spark plug and metal washer.
Figure 29
1. Spark plug and wire location
Checking the Spark Plug
1. Look at the center of the spark plug
(Figure 30). 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.
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 30). Bend the
side electrode (Figure 30) if the gap is not
correct.
Figure 30
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
Installing the Spark Plug
1. Install the spark plug. Make sure that the
air gap is set correctly.
2. Tighten the spark plug to 30 ft-lb(41 N-m).
3. Push the wire onto the spark plug
(Figure 29).
Cleaning the Blower Housing
To ensure proper cooling, make sure the
grass screen, cooling fins, and other external
surfaces of the engine are kept clean at all
times.
Annually or every 100 hours of operation
(more often under extremely dusty, dirty
conditions), remove the blower housing and
any other cooling shrouds. Clean the cooling
fins and external surfaces as necessary.
Make sure the cooling shrouds are
reinstalled. Torque the blower housing
screws to 80 in-lb (9 N-m).
Important: Operating the engine with a
blocked grass screen, dirty or plugged
cooling fins, and/or cooling shrouds
removed, will cause engine damage
due to overheating.
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