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When my engine is cold I normally do not have starting problems. This fall and early winter, however, I have been having problems starting my 912 UL after the engine has been running and is warm. If I land and turn-off the engine for a short time (say 10 or 20 minutes) I have been having problems getting the engine started again. This problem has come up during the very moderate (60 to 70 F) weather we have been having here in Maryland.

When I start the cold engine after it has sat for a few days it starts right-up, but if I fly for a while and land I have problems starting the warmed engine again. When I begin to crank--the engine will quickly "catch" but than just as quickly "stop". This goes on for a while and than the thing finally starts and keeps running. The carbs seem to be well synchronized and the battery is rather new and seems quite strong. I keep thinking that the cooler weather is resulting in a leaner mixture but I have not tried to "choke" the engine during these start-up attempts since I do not want to flood the thing and get stuck away from my home field.

Any ideas or suggestions about how to handle this situation would be appreciated.
  • Re: Warm 912 UL Starting Question

    by » 9 years ago


    Are your fuel hoses in fire sleeve? It helps with some of the heat soaking of the fuel hoses and some vapor production. Gapping your plugs to .023 - .025.

    Try this next time. No choke and crack the throttle open more than usual and then hold the key a tad longer and see if that doesn't start it better.

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


    Thank you said by: James Mason

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