Idle adjusting screw
Low speed needle (L) | High speed needle (H) |
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CARBURETOR ADJUSTMENT
Every unit is run at the factory and the carburetor is set in compliance with Emission Regulations. In addition, the carburetor is equipped with “H” (High Speed) and “L” (Low Speed) needle adjustment limiters that prevent settings outside acceptable limits.
1.Before adjusting carburetor clean or replace air filter and muffler “Spark Arrestor Screen”.
2.Make sure the bar and chain are properly adjusted.
3.Start engine and run several minutes to bring to operating temperature. Flash choke twice during
4.Stop engine.
Turn “H” speed needle counterclockwise (CCW) to stop.
Turn “L” speed needle midway between full clockwise (CW) stop and CCW stop.
5.Idle Speed Adjustment:
•Start engine, turn “Idle” speed adjustment screw CW until the saw chain begins to turn, then turn screw out CCW until the saw chain stops turning.
Turn screw out, CCW, an additional 1/4 turn.
WARNING
Cutting attachment must not move when unit is idling.
6.Accelerate to full throttle for 2 - 3 seconds to clear any excess fuel in the engine, then return to idle.
Accelerate engine to full throttle to check for smooth transition from idle to high speed.
If engine hesitates turn “L” needle CCW 1/8 turn and repeat acceleration.
Continue adjustment until smooth acceleration results.
7.Check idle speed and reset if necessary as described in item 5. If a tachometer is available idle speed should be set to 2700 - 2900 r/min.
CAUTION
When starting, idling adjustment speed should be adjusted not to rotate the saw chain. Correct idle speed is adjusted 2700 to 2900 r/min. Or 1/4 turn CCW from the point the chain stops moving.
When you experience trouble with the carburetor, contact your dealer.
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