B
A
C
D
E
F
g027484
Figure 33
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 that 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 engage the parking brake.
2.
Shut off the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
B
A
g027478
Figure 34
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
g027479
Figure 35
Installing the Spark Plug
Tighten the spark plug(s) to 25 to 30 N∙m (18.5 to 22.1 ft-lb).
B
A
25-30 N-m
18.5-22.1 ft-lb
g027960
C
D
Figure 36
33
