20
1
2
MAINTENANCE
1. Maintain a wire end-play of about 1/16 inch (1-
2mm) with the adjuster and fix it with the
tightening bolt (Ref.2).
WARNING
To reduce the risk of injury from loss of control,
maintain the wire end-play at about 1/16 inch
(1-2mm). If the wire end-play is not maintained,
engine speed may be enough for the clutch to
engage and turn the cutting tool.
C. CHECKING THE SPARK PLUG.
0.5mm-0.6mm
0.020”-0.024”
A
The wrong fuel mix (too much engine oil in the
gasoline), a dirty air filter or unfavorable running
conditions (mostly at low throttle) affect the
condition of the spark plug. These factors cause
deposits to form on the insulator nose which may
result in faulty operation.
1. If the engine doesn't seem to have any power, is
difficult to start or runs poorly at idling speed, first
check the spark plug.
2. Remove the spark plug and see "3. If the Engine
Doesn't Start" on page 14.
3. Clean the dirty spark plug.
4. Check the electrode gap.
It should be 0.20in.(0.5mm) - 0.024in.(0.6mm)
Re-gap if necessary.
5. Use only a suppressed spark plug of the
approved type:
NGK BPMR7A
Correct the problems which caused the fouling of
the spark plug:
Incorrect carburetor setting, too much oil in the
fuel mix, dirty air filter, unfavorable running
conditions, e.g. operating at partial load.
B. THE THROTTLE WIRE ADJUSTMENT
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