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rotax 912 ruff in start

in 912 / 914 Technical Questions 11 years ago
hello guys i hope every body is well and ready for the cresmes time,
i am having a rotax 912 only 110 hrs and lately it sounds ruff in idle ,
so i did the folwing
1 i did the synchronization for the carp by using the carpmate.
2 changed all fuel filters .
3 i cleaned the carps.
4 i changed the fuel.
5 i leaned the carps .
but still the sound is ruff and vipreating on idele 1400-1800 rpm and all the spark plugs are very black.
so please i am seeking for your help .
regards

  • Re: rotax 912 ruff in start

    by » 11 years ago

    Take out your slow running jet and see if it is blocked. Clean it with a strand of copper wire to make sure it is clear and give it a good blow out.

    The plugs can look black quite quickly if you have just done some ground runs and not flown it.

    Mark
    Thank you said by: Mike Roberg
      
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  • Re: rotax 912 ruff in start

    by » 11 years ago

    Hi Avvod,


    Is this a 912 UL or ULS?
    Your idle shouldn't be down in the 1400 or 1500's. You're better off up around 1700-1800. If the plugs are black dry soot then that is from too much low idle. That can be normal. If you run the engine up at higher rpms like when in cruise that black dry soot goes away. Don't judge your plugs color after sitting at idle for a while.
    If you are idling down around 1400 it probably does feel rough.

    p.s.
    Make sure the mixture screw on the bottom of the carb is set at 1.5 turns out.

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

      
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  • Re: rotax 912 ruff in start

    by » 11 years ago

    Thanks my frends
    I di every posipole things .
    But still the same thing :angry:
    I hate this engine .
      
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  • Re: rotax 912 ruff in start

    by » 11 years ago

    Hi Avvod,

    It's a good engine. You just need to find someone close that knows a little more about the Rotax if possible. I would bet your issue is something simple and many times issues are just that simple problems, but people tend to look in the wrong place and sometimes it's just a matter of diagnosing and ruling out a few things.

    Did it sync at idle and at what rpm? The bottom line idle rpm is important.Is this engine a 912 UL or ULS and what is the idle rpm?

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

      
    Report

  • Re: rotax 912 ruff in start

    by » 11 years ago

    Hi Awod,

    We are located in Dubai, United Arab Emirates.
    Please give us a call on: + 971 50 818 6263
    Regards,
    Andre'
      
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