Question about McCulloch Garden

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My chainsaw is reving too high - I found the screw that adjusts it but not sure which way to turn it - when I did turn it it either revs its guts out or doesn't start - so now afraid to turn it too far one way or the other for fear of blowing it up - so do i turn it clockwise or anti clockwise to slow it down???

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  • Start the engine and let it run long enough to warm it up (usually 1-2 minutes is sufficient). Shut off the engine.

  • Check the air filter to see if it is clean, and if it is not, replace it. Check the spark arrest filter in the muffler to be sure it is clean; clean the spark arrester if it is dirty by removing it and burning the deposits off with a BernzOmatic torch, or other torch. Replace the filter if it is in really bad shape.
  • Turn the "H" screw counterclockwise until it stops (should be no more than a 3/4 turn with a small flathead screwdriver. Turn the "L" screw clockwise until it stops. Then turn it counterclockwise 1/4 turn.
  • Set the Idle Speed
  • Be sure the carburetor is set to the standard setting. Start the engine.
  • Turn the "LA" screw clockwise until it stops, or until the chain begins to run. Turn the screw counterclockwise 1 x 1/2 turns.
  • Call your local chainsaw repair shop to have them repair the chainsaw if the chain continues to run after completing Step 2.
  • Choppy Idling and Acceleration Adjustment
  • Be sure the carburetor is set to the standard setting. Start the engine.
  • Verify that the low speed screw "L" is 1/4 turn open.
  • 3 Turn the low speed screw counterclockwise until the engine idles and accelerates.
  • Verify that the new setting works after the engine has cooled and warms up again.



  • Posted on Oct 05, 2010

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