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  1. #26

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    RE: ASP FS61 midrange problems

    Now 1 of the things I have seen is someone bottoming out the lsn with out removing the hsn which damages the spraybar and or the lsn. Making it run rich in the 1/4 throttle range
    IF you are an exp engine tuner an can't seem to tune it then yeah I'd change the carb.
    I do love OS twin needle carbs try it an let us know

  2. #27
    Moderator w8ye's Avatar
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    RE: ASP FS61 midrange problems

    I had two of these engines at one time for about 5 years and there was never a rich midrange problem
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
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    Original AMA #31261

  3. #28

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    RE: ASP FS61 midrange problems


    ORIGINAL: kerwin50

    Now 1 of the things I have seen is someone bottoming out the lsn with out removing the hsn which damages the spraybar and or the lsn. Making it run rich in the 1/4 throttle range
    IF you are an exp engine tuner an can't seem to tune it then yeah I'd change the carb.
    I do love OS twin needle carbs try it an let us know
    One of the first things i did was to get a new carb, but I couldn't see much difference. An OS carb would probably solve the problem, but I'm not sure I want to spend half the price of a new engine on a new carb... OTOH OS carbs are usually very good.

  4. #29
    Moderator w8ye's Avatar
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    RE: ASP FS61 midrange problems

    The OS 52 carb is a direct bolt on swap.

    I've also seen Magnum carbs on the OS engines.
    Attended the CutFinger Institute of DirtNap University for years but never did graduate....
    Recipient, Mangledhand award August 2008
    Club Saito Member #7
    Original AMA #31261


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