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4.
Remove the sediment cup and O-ring
18).
1. O-ring
5.
Wash the sediment cup in a nonflammable
solvent and dry it thoroughly.
6.
Place the O-ring in the fuel valve and install the
sediment cup, tightening it securely.
7.
Move the fuel shutoff lever to the On position.
If any fuel leaks, repeat this procedure and
replace the O-ring.
Servicing the Spark Plug
Service Interval: Every 100 hours—Inspect, clean,
and adjust the spark plug; replace it
if necessary.
Every 200 hours—Replace the spark plug.
Type: NGK BPR6ES or equivalent.
Air Gap: 0.76 mm (0.03 inch)
Removing the Spark Plug
1.
Park the machine on a level surface, disengage
the cutting blades, shut off the engine, and wait
for all moving parts to stop, and turn the engine
switch to the O
FF
2.
Disconnect the wire from the spark plug.
3.
Clean the area around the base of the plug(s) to
keep dirt and debris out of the engine.
4.
Remove the spark plug(s) as shown in
19.
Figure 18
2. Sediment cup
position.
(Figure
Checking the Spark Plug
Important:
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
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engine is operating properly. A black coating on the
insulator usually means the air cleaner is dirty.
Set the gap to 0.76 mm (0.03 inch).
Installing the Spark Plug
1.
Carefully install the spark plug by hand (to avoid
cross threading) until it is hand tight.
2.
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:
very hot and can damage the engine;
overtightening a spark plug may damage the
threads in the cylinder head.
3.
Connect the wire to the spark plug.
Figure
19
Figure 19
Do not clean the spark plug(s).
Figure 20
A loose spark plug can become
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