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Thread: Craftsman chainsaw will start, then dies

  1. #1

    Default Craftsman chainsaw will start, then dies

    It's a 42cc. It will start when very cold and run for 20-30 seconds. I've checked the muffler. I've checked spark. I've cleaned the carb(everything looked very clean, including the screen). It's a Walbro. I tightened the adjustment screws all in, then backed out 1-1/2 turns. If I try to give gas, it dies. The piston and cylinder looked good from what I could see when I had the muffler off. I'm at a loss. The carb was rebuilt last year and ran like a charm. The last time I used it I ran it dry for storage. It's new gas this time. What could the problem be?

  2. #2

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    Quote Originally Posted by biffula View Post
    It's a 42cc. It will start when very cold and run for 20-30 seconds. I've checked the muffler. I've checked spark. I've cleaned the carb(everything looked very clean, including the screen). It's a Walbro. I tightened the adjustment screws all in, then backed out 1-1/2 turns. If I try to give gas, it dies. The piston and cylinder looked good from what I could see when I had the muffler off. I'm at a loss. The carb was rebuilt last year and ran like a charm. The last time I used it I ran it dry for storage. It's new gas this time. What could the problem be?
    Hi Biffula, Sounds like a fuel issue still . Have you installed a carb kit?. The carb can be clean, but the diaphragms can still be dried out and not flexible. Just a thought.
    Tom
    Ontario, Canada.

  3. #3
    Join Date
    Nov 2008
    Location
    NewBrunswick Canada
    Posts
    651

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    There should be a small fuel filter down inside the tank, which is connected to your fuel supply line, sounds like its fuel starved. Not a big job, you will need somthing hooked to get it out. Hope this helps.
    MJ

  4. #4

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    Forgot to post originally, but I've checked the fuel lines, all in good shape. Fuel filter is new.

    Here's the latest. I put a new carb kit in. It will start up and run full tilt, but as soon as I let off full throttle, it dies. I've tried adjusting the low idle to no avail.

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