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  1. #1

    Join Date
    Dec 2002
    Somerset, , UNITED KINGDOM
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    OS FX 91 carb swap

    Hello there.
    I have a new in box OSFX91. It's been in my draw since the 91 FX fistst came out.

    I have just bought one of the arf dirty birds and have toyed with putting the engine in.

    On doing some research I notice all the threads about carb/needle valve issues.
    I have the early type of engine with the metal valve housing.
    My question is can I just fit a carb with the needle valve at the front and totally dispense with the rear mounted needle valve?
    If I can what's the part number?


  2. #2
    Join Date
    Apr 2002
    Champaign, IL

    RE: OS FX 91 carb swap

    You will need to measure the intake diameter to see what size carburetor the engine can take. Then, purchase a .91-sized carb with that dimension at the neck of the carb that goes into the engine. O.S. doesn't have a part to fit.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007

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