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Idle speed adjustment screw
Cylinder fins
Silencer cover
Silencer
ADJUSTING CARBURETOR
(As Required)
GENERAL INFORMATION
The idle speed adjuster screw controls the throttle
opening at the idle position.
IDLE ADJUSTMENT
1. Start engine and allow it to run at high idle until
warm.
2. Turn the idle speed screw clockwise until drill
bit begins to move.
3. Turn idle screw counterclockwise 1 and 1/2 to 2
turn or until the drill bit stops (2,700 to 3,300
r/min).
NOTE
When there is some trouble with the carburetor,
contact your dealer.
CLEANING CYLINDER FINS
(Check Periodically)
NOTE
Clogged fins will cause poor engine cooling.
1. Carefully remove housing and clean dirt and
dust from fins.
2. Reinstall housing.
CLEANING SILENCER AND
EXHAUST PORT
(Check Periodically)
1. Carefully remove housing halves.
2. Remove and disassemble silencer.
NOTE
Be careful not to scratch the cylinder or piston
when cleaning the cylinder exhaust port.
3. Clean deposits from cylinder exhaust port and
silencer.
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