Craftsman 358.351080 - Manual (Page 26)

SERVICE AND ADJUSTMENTS
ADJUSTING PROCEDURE
IDLE SPEED ADJUSTMENT “Г’
• Allow the warm engine to idle.
• Adjust the Idle Speed until the engine continues to run
without stalling and without the chain moving.
— Turn clockwise to increase engine speed if enaine
stalls or dies.
- Turn counterclockwise to slow engine down and/or to
keep the chain from turning.
• No further adjustments are necessary if chain does not
move at idle speed and if performance is satisfactory.
LOW SPEED MIXTURE ADJUSTMENT “L"
• Allow engine to idle.
• Turn the Low Speed Mixture Adjustment slowly dock-
wise until the RPM starts to drop. Note the position.
• Turn the Low Speed Mixture Adjustment slowly counter­
clockwise until the RPM speeds up and starts to drop
again. Note the position.
• Set the Low Speed Mixture at the midpoint between the
two positions.
HIGH SPEED MIXTURE ADJUSTMENT“H”
IMPORTANT: DO NOT OPERATE ENGINE AT FULL
THROTTLE FOR PROLONGED PERIODS WHILE MAK­
ING HIGH SPEED ADJUSTMENTS AS DAMAGE TO THE
ENGINE CAN OCCUR.
• Make a test cut.
• Based on performance of the saw while cutting, adjust
the high speed mixture in 1/16 turn increments as fol­
lows:
- 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 if the saw has speed while out of the
cut, but dies in the cut or lacks power while cutting.
• Repeat the test cut.
• Continue with 1/16 turn adjustments until the saw perfor­
mance 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 Adjustment 1/16 of a turn at
a time counterclockwise until 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 performance.
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