Checking The Spark Arrester - Toro 74997 Operator's Manual

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 0.75 mm (0.03 inch).
A
Figure 58
Installing the Spark Plug
Tighten the spark plug(s) to 22 N∙m (16 ft-lb).
Figure 59
B
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Checking the Spark Arrester

For a Model with a Spark Arrester
Service Interval: Every 50 hours
WARNING
Hot exhaust system components may ignite
gasoline vapors even after you shut off the engine.
Hot particles exhausted during engine operation
may ignite flammable materials. Fire may result in
personal injury or property damage.
Do not refuel or run the engine unless a spark
arrester is installed.
1. Shut off the engine, wait for all moving parts to stop,
and remove key. Engage parking brake.
2. Wait for the muffler to cool.
3. If there are any breaks in the screen or welds, replace
the arrester.
4. If the screen is plugged, remove the arrester and
shake the loose particles out of the arrester and clean
the screen with a wire brush (soak it in solvent if
necessary). Install the arrester on the exhaust outlet.
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