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Servicing the Spark Plug
Service Interval: Every 100 hours
Every 300 hours
Use an NGK BPR6ES spark plug or equivalent.
1.
Shut off the engine and wait for all moving
parts to stop; refer to
Maintenance (page
2.
Clean around the spark plug.
3.
Remove the spark plug from the cylinder head.
Important:
Replace a cracked, fouled, or
dirty spark plug. Do not sand blast, scrape,
or clean the electrodes because engine
damage could result from grit entering the
cylinder.
4.
Set the gap on the plug to 0.7 to 0.8 mm (0.028
to 0.031 inch)
Figure 18
1. Center-electrode insulator
2. Side electrode
5.
Carefully install the spark plug by hand (to avoid
cross threading) until it is hand tight.
6.
Tighten the spark plug an additional 1/2 turn if
it is new; otherwise, tighten it an additional 1/8
to 1/4 turn.
Important:
A loose spark plug can become
very hot and can damage the engine;
overtightening a spark plug may damage the
threads in the cylinder head.
7.
Connect the wire to the spark plug.
Preparing the Machine for
10).
3. Air gap
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