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Rough idle

in 912 / 914 Technical Questions 10 years ago

  • Re: Rough idle

    by » 10 years ago

    I am looking for the adaptor nipples. I may have them in the kit that I got with the syncromate I hope to get out to the airplane this afternoon. Thanks for the help.


    Charlie
      
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  • Re: Rough idle

    by » 10 years ago

    Here is a basic carb sync explanation. This can vary some between users and or experienced people, but should give you a better and basic understanding of what to do.

    p.s.
    I wouldn't use the clear plastic tubing on the set of gauges in the picture. You can buy some regular vacuum hose from any auto parts store.








    912carbsync.pdf (You do not have access to download this file.)
    Rog-O-Mate.jpg (You do not have access to download this file.)
    CarbMate.jpg (You do not have access to download this file.)

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

      
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  • Re: Rough idle

    by » 10 years ago

    the nipples are Rotax part number 940551
      
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  • Re: Rough idle

    by » 10 years ago

    Thanks for the part number.
    I went out yesterday after work and pulled the right carb. The idle jet was blocked and it took some effort to clean it out. I used a couple of strands of 16 ga wire and lots of carb cleaner. Is it a good idea to replace the jets?
    Reset the idle mixture to 1.5 and reinstalled. Idle is good now but I will need to sync on Friday when I have a helper

    Charlie
      
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  • Re: Rough idle

    by » 10 years ago

    I have had great success doing the carb sync on my RV-12 without the need for an "assistant". You can extend the sync vacuum hoses (I use "equal lengths" from the carbs to the gauges - although I don't think that matters much) from the two manifold connection points back into the cockpit via any readily accessible open hole (e.g., vent, window, door ajar, etc.). Attach lengths of monofilament fishing line to the two throttle arms and run the lines straight back into the cockpit. Now you can sit comfortably and safely in the cockpit monitoring the sync gauges while you gently tug on each carb's monofilament line to determine which carb needs tweaking. Then shut-down the engine, tweak the desired carb, restart the engine, and verify your settings. It might take an iteration or two to nail it. Works great for me and no one has to stand near the twirling propeller! :)
      
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