Cleaning the air fi lter
Remove the air fi lter cover and the fi lter. Rinse it in
warm soap suds. Check that the fi lter is dry before
reassembly. An air fi lter that has been used for some
time cannot be cleaned completely. Therefore, it
must regularly be replaced by a new one. A damaged
fi lter must always be replaced.
NOTE
Saturate the element in 2-cycle oil or the
equivalent. Squeeze the element to distribute the
oil completely and to remove any excess oil.
Spark plug (Fig. 15)
The spark plug condition is infl uenced by:
○ An incorrect carburetor setting.
○ Wrong fuel mixture (too much oil in the
gasoline).
○ A dirty air fi lter.
○ Hard running conditions (such as cold weather).
These factors cause deposits on the spark plug
electrodes, which may result in malfunction and
starting diffi culties. If the engine is low on power,
diffi cult to start or runs poorly at idling speed, always
check the spark plug fi rst. If the spark plug is dirty,
clean it and check the electrode gap. Readjust if
necessary. The correct gap is 0.024״ (0.6 mm).
The spark plug should be replaced after about 100
operation hours or earlier if the electrodes are badly
eroded.
0.024″ (0.6 mm)
Fig. 15
NOTE
In some areas, local law requires using a resistor
spark plug to suppress ignition signals. If this
machine was originally equipped with resistor
spark plug, use the same type of spark plug for
replacement.
Cutter blade (Fig. 16, 17)
The blades are installed to the cutter guide with the
four or fi ve bolts. Those bolts are tightened with a
clearance so that the cutters can move smoothly.
Fig. 16
Fig. 17
When clearance is too small
The cutters do not move properly and the sliding
surfaces may seize.
When clearance is too large
The cutters are poor in sharpness.
To adjust the cutter clearance
1. Loosen the cutter fi xing nuts.
2. Fully tighten the cutter fi xing bolts and then
loosen them approx. 1/2 turn.
3. With the bolts set at that position, tighten the
cutter fi xing nuts.
Be sure to replace cutter guide fi xing bolts when
they are loosened, worn or damaged. Also be sure
to replace damaged cutter blade.
NOTE
Properly lubricate the cutter sliding surfaces with
machine oil.
Gear case (Fig. 18)
Apply a good quality lithium based grease through
the grease fi tting until a small amount comes out
between the cutter blades and the gear case.
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000BookTHT210BUS.indb11000BookTHT210BUS.indb11 2009/07/1318:22:282009/07/1318:22:28
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