Question about Husqvarna Chain Saw 20" Bar

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I have a husqvarna 575xp which i bought used.It was running great for 3 weeks when the motor started to race, the stop switch didn't seem to work in this state so i had to use the choke to shut it down. I thought it might had been the air filter so i blew it out and started it with the same problem. Could someone point me in the right direction.

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  • nedkelly900
    nedkelly900 Aug 05, 2010

    Have you tried turning the idle screw? The stop switch not working, should have nothing to do with your fast idle problem.

  • inshaper Aug 08, 2010

    No I havent tried the idle screw cause i never adjusted it in the first place but I will turn it in and then slowly turn it out in quater turn incredments. As for the stop switch it was working fine before i had this racing problem.

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You need to inspect the throttle mechanism at the carburetor. When you pull the throttle trigger, it should move the throttle arm to it's 'full on' stop, and when it is released, the arm should come back to the idle stop screw. If the action seems to be indefinite, take the throttle trigger mechanism apart (make notes of part placement as you go), and clean it of sawdust and dirt. Don't run the engine until the throttle is working correctly. The 'stop' switch may also be full of sawdust, or the connecting wire may be damaged. Make sure the carburetor fasteners are tight as an air leak behind the carburetor can cause engine racing. Hope this helps!

Posted on Aug 05, 2010

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