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  1. C

    rpm random drop

    Yesterday I checked the fuel flow to the gascolator in every tank: aprox 1 litre per minute (this is more than enough). I checked the carb cups and I didn't found water or dirt. I am leaning to thing that the problem could be some kind of contamination in the fuel. When hangaring the plane, I...
  2. C

    rpm random drop

    In the video it is difficult to hear but it is really dropping the rpm in the engine. Today I have been checking the venting tube in the tanks and the fuel flow from the gascolator. Everything seems to be OK but I am not sure. The problem is that it is randomly happening and I don't know exactly...
  3. C

    rpm random drop

    Rpm are dropping around 200 at 5000 rpm only for several seconds. Not all the time. When I am reducing to 4800 rpm it stops. I found some water long time ago. I am going to check with more detail (The problem is that I am closing the tanks in the hangar and when I open, the fuel has to travel...
  4. C

    rpm random drop

    It is happening during cruise and full throttle, in the air, level flight and climbing. It has been happening one year ago and I changed completely the engine and now I have changed the fuel lines and fuel manifold. I will concentrate more in the fuel: water? dirty? bubble?. But how can I see...
  5. C

    rpm random drop

    Rotax 912 with only 80 hours. I charged the floaters of the carburetors and they were clean. if dirty I think that the fuel pressure will drop. air leaking? Do you mean vapor lock or could be other reason? I don't think it is vapor lock. Fuel return line is in accordance with rotax. Thank you
  6. C

    rpm random drop

    I am having some rpm dropping randomly and only for a few seconds. Fuel pressure is not going down when happening. I have changed and revised all the fuel lines and distribution in according with rotax. When happening I am switching off every electric devices and the ignitions to identify the...
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