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Posted on Sep 19, 2009
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Need to adjust 3 screws. I already try to adjust them, but it runs too fast or dies. Cannot get it right. I know I have to turn in low and high all the way and then unscrew about 1 1/4 turn back. Where to start with idle screw? How to proceed? I also did all the maintenance; new park plug, fuel filter, clean air filter, spark arresting screen, have fresh fuel and oil. It is really frustrating. I won't go to sears because it didn't work properly when I bought it, then they did some adjustment that worked few months only.

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  • Expert 61 Answers
  • Posted on Sep 19, 2009
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Joined: Sep 07, 2009
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Ok here goes. you are write to wind out the screws 1 1/4 turns +/-

you have 2 scews for the carb jets, the other is the idle speed adjuster. it has a conical shaft which simply open the throtle more as you screw it in. wind this in so that it will run a bit fast . if you can, start the saw. Without pulling the throttle, slowly turn the "low" jet in , or out untill the saw runs faster. if it starts running too fast, adjust the idle speed scew down a little. do this untill it is running best. adjust the idle speed down until the cahin just stops moving. the low speed is now set. now pull the trigger and run the saw full throttle. adjust the "high" jet in or out slightly until it is running fastest. Note..if you turn either screw in too far, the engine will stall.

I hope this helps,

Another thing that could cause problems is if there is an air gap between the carb and the cylinder. check that fixing screws are tight. check that the gasket is ok. some saws have a small rubber manifold between the carb and the cylinder. if this manifold is perferated or damaged,it will let air into the engine, and therefore will not run right.
good luck.

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If you have aready tried to adjust them then the adjustments below should get it running for you for final adjustment when warm.
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Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
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Then you will re-adjust the low speed of the engine when the engine is warm by turning the idle screw in or out till the engine runs smoothly at idle speed, around 1200 RPM.
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