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Servicing the Spark Plug
Service Interval: Every 100 hours/Every 6 months
(whichever comes first)—Check the
spark plug.
Every 300 hours/Yearly (whichever comes
first)—Replace the spark plug.
Spark Plug Specifications
Type: NGK BPR6ES or equivalent
Gap: 0.7 to 0.8 mm (0.028 to 0.031 inch)
Note:
Use a 21 mm (13/16 inch) spark-plug wrench
for removing and installing the spark plug.
Removing the Spark Plug
1.
Park the machine on a level surface and shut
off the engine.
2.
Ensure that the machine surfaces are cool.
3.
Pull the spark-plug wire off the terminal of the
spark plug
(Figure
Figure 42
1. Spark plug
4.
Clean around the spark plug.
5.
Rotate the spark plug counterclockwise using
a 21 mm (13/16 inch) spark-plug wrench to
remove the plug and the sealing washer
43).
42).
2. Wire
(Figure
Checking the Spark Plug
Important:
Do not clean the spark plug. Always
replace the spark plug when it has a black coating,
worn electrodes, an oily film, or cracks.
Note:
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.
Set the gap to 0.7 to 0.8 mm (0.028 to 0.031 inch).
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Figure 43
Figure 44
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