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Our EAA Tech set the idle on my RV-12 with the vacuum gage. He has done a number of them previously, and I feel confident he did it correctly.
However, I have had three occasions, so far, where the engine stopped when I pulled the throttle to idle. All three times it has been on the ground.
Once outside my hangar at an early start and run, I was ready to shut down, pulled the throttle to idle and turned off one of the ignitions. Twice it occurred after landing and roll out. Instant restart with key start.....
My EAA Tech says I bent the carburetor by pulling too hard to idle.....I don't think so. Is there a test or measurement to confirm the carburetor has been bent?
I think the idle should be reset to a little hight RPM.
  • Re: Idle on 912

    by » 8 years ago


    If the arms are bent, the carb was improperly adjusted. There are cable stops to prevent this. For proper adjustment follow the carburetor synchronization procedure in section 12 of the RV-12 MM. A copy can be downloaded from there website.

  • Re: Idle on 912

    by » 8 years ago


    Hi William,

    The carbs may have been set, but maybe they failed to reset the cable stops. The RV12 has cable stops. These stops should come to rest when you have the throttle all the way back. With your Vernier throttle you have enough muscle in your arm pull to bend the carb throttle stop plates. These can be bent back in place then you need to sync the idle rpm again. If your idle rpm is too low and you bent the plates then the engine may die due to low rpm. Depending on the plane and pilot I personally prefer 1650-1750 so long as the pilot doesn't just sit there at the lowest rpm and idle. Use the low idle setting for engine shutdown.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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