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  1. #1

    Join Date
    May 2008
    Apopka, FL
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    OS 120 AX and black exhaust oil


    Ran my 120 AX after letting it set idle for several months. The exhaust oil discharge was very black. Someone said it was due to friction between the muffler and engine. Make sense? If so what solution do you propose?

    Could it be a bearing issue? No rough turning, strange sounds. Starts with one flip of the prop and runs fine.

    Thanks for your help!
    Kevin Goza

  2. #2

    Join Date
    Apr 2005
    Peoria, AZ

    RE: OS 120 AX and black exhaust oil

    The friction with the muffler that they might be talking about is when the muffler can move relative to the exhaust outlet. If that's the case, tighten the screws holding the muffler in place and check them frequently.

  3. #3
    Join Date
    Apr 2002
    Champaign, IL

    RE: OS 120 AX and black exhaust oil

    The muffler is held onto the engine by two bolts. This does allow the muffler to move around a bit. This will cause some aluminum to rub off of the muffler or exhaust port. Exhaust residue will also "cook" inside the muffler and become dark. The two together cause the dark residue to form. You can check this by running without the muffler and capturing some of the exhaust residue on a piece of white card. If you still see a dark residue with small metal particles, you do have an internal problem.
    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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