B
A
C
D
E
F
g027484
Figure 32
Servicing the Spark Plug
Service Interval:
Every 100 hours/Yearly (whichever comes
first)—Check the spark plug(s).
Every 200 hours/Every 2 years (whichever comes
first)—Replace the spark plug(s).
Make sure the air gap between the center and side electrodes
is correct before installing the spark plug. Use a spark-plug
wrench for removing and installing the spark plug(s) and a
gapping tool/feeler gauge to check and adjust the air gap.
Install a new spark plug(s) if necessary.
Type:
Champion RN9YC or NGK BPR6ES
Air gap:
0.76 mm (0.03 inch)
Removing the Spark Plug
1.
Disengage the PTO and ensure the parking brake is
engaged.
2.
Stop the engine, remove the key, and wait for all moving
parts to stop before leaving the operating position.
B
A
g027478
Figure 33
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.
Checking the Spark Plug
Important:
Do not clean the spark plug(s). Always
replace the spark plug(s) when it has: a black coating,
worn electrodes, an oily film, or cracks.
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.
Set the gap to 0.76 mm (0.030 inch).
B
A
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Figure 34
31
