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Thread: RPM drop

  1. #1

    Default RPM drop

    For you mechanics out there! I recently started to get an excessive RPM drop on run up when I pull the carb heat. Was usually around a 200 rpm drop but has now gone to 500... Any suggestions on things to check? It just don't seem right. Its a PA-18 with a 160 HP. Thanks

  2. #2
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    Jan 2012
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    Default

    Maybe air obstruction or exhaust leak (carbon monoxide)

  3. #3
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    runs rich with carb heat, are you running too rich already? then way too rich with carb heat? primer leaking?

  4. #4

    Default

    Check the float bowl screws on the carb they can come loose and will cause the RPM drop. Look for gas stains running down side of float bowl.
    I am not a mechanic but had same problem.
    DENNY

  5. #5
    Member algonquin's Avatar
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    Feb 2007
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    Seldovia, alaska
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    I don't intend this as a wise guy comment, but you need to have a A&P look at it, there are several thing that could be wrong and almost everything is not owner maintenance. I'm a A&P and wouldn't try to guess as that leads to giving it a try at test flight with a masked problem that has been covered by doing something else to the engine.

  6. #6
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    Tennessee
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    I hope you aren't flying that little Cub unless and until the problem is isolated and fixed !!!

  7. #7

    Default

    Thanks all for the input, It was the float bowl that was coming loose... problem solved!

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