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Servicing the Spark Plug
Service Interval: Every 100 hours or yearly,
whichever comes first
Ensure 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: Briggs and Stratton® 491055
Air gap: 0.76 mm (0.03 inch)
Removing the Spark Plug
1.
Park the machine on a level surface, 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.
3.
Remove the spark plug as shown in
Figure 43
Checking the Spark Plug
Important:
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 0.75 mm (0.03 inch).
Figure
43.
Installing the Spark Plug
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Do not clean the spark plug(s).
Figure 44
Figure 45
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