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SERVICE AND ADJUSTMENTS
ADJUSTING PROCEDURE
IDLE SPEED ADJUSTMENT
• Allow the warm engine to idle.
• Adjust the Idle Speed Screw untilthe engine continues
to runwithout stalling and without the chain moving.
- Turn screw clockwise to increase engine speed ff
engine stalls or dies.
- Turn screw counterclockwise to slow engine down
and/or to keep the chain from turning.
• No further adjustments are necessary ifchain does not
move at idle speed and if performance is satisfactory.
LOW SPEED MIXTURE ADJUSTMENT
• Allow engine to idle.
• Turn the Low Speed Mixture Screw slowly clockwise
until the RPM starts to drop.Note the position.
• Turn the Low Speed Mixture Screw slowly counter-
clockwise untilthe RPM speeds up and starts to drop
again. Note the position.
• Set the Low Speed Mixture Screw at the midpoint
between the two positions.
HIGH SPEED MIXTURE ADJUSTMENT
IMPORTANT: DO NOT OPERATE ENGINE AT FULL
THROTTLE FOR PROLONGED PERIODS WHILE MAK-
ING HIGH SPEED ADJUSTMENTS AS DAMAGE TO
THE ENGINE CAN OCCUR.
CAUTION: A CARBURETOR SETTING
THAT IS TOO LEAN (CLOCKWISE
ADJUSTMENT ON HIGH SPEED SCREW
FOR MAXIMUM SPEED) WILL CAUSE
ENGINE DAMAGE TO ANY 2-CYCLE
ENGINE FROM OVERHEATING AND LACK
OF LUBRICATION. NEVER SET THE HIGH
SPEED SCREW SO FAR CLOCKWISE
THAT YOU HAVE HIGH ENGINE SPEED
LACKING POWER TO CUT. AN EFFECTIVE
APPROACH FOLLOWS.
- TURN HIGH SPEED SCREW COUNTER-
CLOCKWISE UNTIL ENGINE LOSES
POWER WHILE CUTTING,
- TURN HIGH SPEED SCREW CLOCK-
WISE USING 1/16 TURN INCREMENTS
ONLY UNTIL THE ENGINE HAS POWER
WHILE CUTTING.
IF THE ENGINE DOES NOT OPERATE
ACCORDING TO THESE INSTRUCTIONS
AFTER REPEATING THE ADJUSTING
STEPS, DO NOT USE THE UNIT. FOR
FURTHER ASSISTANCE, PLEASE CALL
OUR CUSTOMER ASSISTANCE HOTLINE
AT 1-800-235-5878.
• Make a test cut.
• Based on performance of the saw while cutting,adjust
the high speed mixture screw in 1/16 turn increments
as follows:
- Clockwise if saw loses power in the cut. Do not adjust
for best power by sound or speed, but judge by how
well the saw performs in the cut.
- Counterclockwise ff the saw has speed while out of
the cut, but dies in the cut or lacks power while cut-
ting.
• Repeat the test cut.
• Continue with 1/16 turn adjustments until the saw per-
formance is acceptable while cutting.
• After completing adjustments, check for acceleration.
ACCELERATION CHECK
• If the engine dies or hesitates instead of accelerating,
turn the Low Speed Mixture Screw 1/16 of a turn at a
time counterclockwiseuntil you have smooth accelera-
tion.
• Check the idle speed for stability and no chain move-
ment. Adjust as necessary.
• Recheck for smooth acceleration and stable idle.
Repeat process as necessary for acceptable perfor-
mance.
-26-
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