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  1. #1

    Join Date
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    OS52FS Idle Adjust

    Bax,

    My OS52FS, 40N Carb, was running superbly until a hard landing in the weeds.
    Now it won't transition from low to high.
    The pinch test indicates the low end is to lean, dies instantly.
    I am guessing something is clogging the air bleed hole.
    I can't find the air bleed; where does the low end air enter the carb?

    The diagram I have found does not indicate the low end adjustment
    screw or the air intake.
    [link]http://downloads.hobbico.com/evpl/osm/ev44281000.pdf[/link]

    Thanks for your help,
    KW_Counter

  2. #2
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    Apr 2002
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    Champaign, IL
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    RE: OS52FS Idle Adjust

    There is no airbleed hole. The carburetor for your engine does not use an airbleed hole for idle mixture adjustment. There is a small screw next to the needle valve where you adjust the idle mixture. The air enters the carburetor through the venturi. On the exploded diagram of the carburetor, part #4, nozzle assembly, has the idle mixture adjustment.

    If the engine won't transition from low to high, you'll need to check the entire fuel system to make sure it's OK, and then get the engine properly set. If a fuel passage has gotten something into it, then you'll have to clean the carb.
    Bill Baxter, Manager Hobby Services/Futaba Service/North America
    3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
    Service Phone: 217 398-0007
    Email: hobbyservices@hobbico.com

  3. #3

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    RE: OS52FS Idle Adjust

    Bax,
    Thanks!
    KW_Counter


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