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  1. #1
    MX240's Avatar
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    Nov 2003
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    PoDunk City, NE
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    OS 120 lll Pump

    I have a OS 120 with a pump. Has been running good. Now RPM varies in the air...not the kind of too rich or lean rumming.
    I changed plugs with no help.
    What starts to happen when the pump wears out?
    Jim

  2. #2
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    Apr 2002
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    Champaign, IL
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    RE: OS 120 lll Pump

    Usually, the pump doesn't wear out.  It can become contaminated and have passages blocked by trash in the fuel.  Also, the regulator can have its ports blocked by trash, too.  Erratic running can usually be traced to the fuel system or by tuning.  If it's too rich, the engine can surge.


    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


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