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Servicing the Spark Plug
Service Interval: Every 100 hours
Check the spark plug after every 100 operating hours. Use an
Champion RN9YC spark plug or equivalent.
1. Stop the engine and wait for all moving parts to stop.
2. Disconnect the wire from the spark plug.
3. Clean around the spark plug.
4. Remove the spark plug from the cylinder head.
Important: Replace a cracked, fouled, or dirty
spark plug. Do not clean the electrodes because
grit entering the cylinder can damage the engine.
5. Set the gap on the plug to 0.76 mm (0.030 inch) (Figure
18).
1. Center electrode insulator
2. Side electrode
3. Air gap (not to scale)
6. Install the spark plug and the gasket seal.
7. Torque the plug to 20 N-m (15 ft-lb).
8. Connect the wire to the spark plug.
Replacing the Nylon Cutting
String
1. Turn the fuel tap to the off position and close the vent
knob.
2. Disconnect the wire from the spark plug.
3. Turn the machine on its left hand side, with the
carburetor facing upwards.
4. Wearing protective gloves, remove the nylon cutting
line.
5. Place one length of nylon cutting line into the desired
cutting height setting. Ensure that a second length
is placed in the corresponding cutting height on the
opposite side of the cutting disc.
Note: If using a spare reel, cut the line to a length of 200 mm.
Figure 18
Cleaning the Machine
Service Interval: Before each use or daily
After each use
WARNING
The machine may dislodge material from under the
machine housing.
• Wear eye protection.
• Stay in the operating position (behind the
handle).
• Do not allow bystanders in the area.
1. Tip the machine on its side.
2. Use a brush or compressed air to remove grass and
debris from the exhaust guard, the top cowl, and the
surrounding deck areas.
14
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