Toro 74901 Z Master 5000 Operator's Manual page 38

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5. Install the lefthand hydraulic unit shroud (Figure 52).
Checking the Spark Plug
Important: Never 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 0.030 inches (0.76 mm).
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Installing the Spark Plug
Tighten the spark plug(s) to 18-22 ft.-lb (24.4–29.8 N-m).
Figure 53
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Figure 54
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Figure 55