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○ Unnecessary wear on the engine parts
○ Abnormal fuel consumption
Clean the air fi lter daily or more often if working in exceptionally
dusty areas.
Cleaning the air fi lter
Remove the air fi lter cover and the fi lter (32). 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 with a new one. A damaged
fi lter must always be replaced.
Fuel fi lter (Fig. 29)
Drain all fuel from fuel tank and pull fuel fi lter line from tank. Pull fi lter
element out of holder assembly and rinse element in warm water with
detergent.
Rinse thoroughly until all traces of detergent are eliminated.
Squeeze, do not wring, away excess water and allow element to air
dry.
NOTE
If element is hard due to excessive dirt build-up, replace it.
Chain oil fi lter (Fig. 30)
Remove the oil fi lter and thoroughly wash it in solvent.
Spark plug (Fig. 31)
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)
10
32
Fig. 28
Fig. 29
Fig. 30
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. Re-adjust if necessary. The correct gap is 0.6
mm. The spark plug should be replaced after about 100 operation
hours or earlier if the electrodes are badly eroded.
0.6 mm
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 same type of spark plug
for replacement.
Muffl er (Fig. 32)
Remove the muffl er and clean out any excess carbon from the
exhaust port or muffl er inlet every 100 hours of operation.
Cylinder (Engine cooling) (Fig. 33)
The engine is air cooled and air must circulate freely around engine
and over cooling fi ns on cylinder head to prevent overheating.
Every 100 operating hours, or once a year (more often if conditions
require) clean fi ns and external surfaces of engine of dust, dirt and oil
deposits which can contribute to improper cooling.
Fig. 31
Fig. 32
Fig. 33
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