Servicing The Spark Plug - Toro 74766 Operator's Manual

Figure 39

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
Air gap: 0.76 mm (0.03 inch)
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Removing the Spark Plug
1. Disengage the PTO and move the motion-control
levers to the P
ARK
2. Shut off the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
A
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Figure 40
Note: Due to the deep recess around the spark plug,
blowing out the cavity with compressed air is 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 (0.03 inch).
A
Figure 41
position.
B
B
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