Exmark Radius X Series Operator's Manual page 54

Maintenance
Removing the Spark Plug
1. Disengage the PTO and ensure the parking brake
is engaged.
2. Stop the engine, remove the key, and wait for all
moving parts to stop before leaving the operating
position.
3. Disconnect the wire from the spark plug.
Note: Due to the deep recess around the spark
plug, blowing out the cavity with compressed air
is usually the most effective method for cleaning.
The spark plug is most accessible when the blower
housing is removed for cleaning.
Checking the Spark Plug
1. Inspect the spark plug
Note: 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.
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.
1. Center electrode
insulator
2. Side electrode
Figure 55
Figure 56
3. Air gap (not to scale)
2. Check the gap between the center and side
electrodes.
3. Set the gap to 0.030 inch (.76 mm).
Installing the Spark Plug
1. Install the spark plug. Make sure that the air gap
is set correctly.
2. Tighten the spark plug to 18.5–22.1 ft-lb (25–30
N-m).
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3. Push the wire onto the spark plug.
Check Valve Clearance
Service Interval: Every 300 hours—Check
Contact an Authorized Service Dealer.
• Intake: .004–.006 inches (.10–.15 mm)
• Exhaust: .006–.008 inches (.15–.20 mm)
Check and Clean Combustion
Chamber
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Service Interval: Every 300 hours—Check
Contact an Authorized Service Dealer.
54
Figure 57
valve clearance (Exmark
engine).
and clean combustion
chamber (Exmark engine).
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