Rotax 912ULS shakes alot at start

Re: Rotax 912ULS shakes alot at start

by Kenneth Hagesten » 11 years ago

Kenneth Hagesten

2 38 0

Yes you are right with that. I have used my engine 15 years and 1200 hours. It is 80 hp UL. For me the problem appears only with cold engine in relative cold weather. (some plus degrees Celsius). When i preheat the engine it does not shake.

Re: Rotax 912ULS shakes alot at start

by Roger Lee » 11 years ago

Roger Lee

131 5.38k 5.44k

How cold is cold?
There is a video here on the forum that shows the effects of cold starts. If you live in cold country where starts are in the 20F's and below on a regular basis then engine
pre-heating is a good idea. This may be the only problem, but other issues may be adding on. I happen to live in a warm climate, but have friends with morning temps down in the single digits. They use a Tanis pre-heater and all swear by it for smooth quick and easy starts.

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

Re: Rotax 912ULS shakes alot at start

by Kenneth Hagesten » 11 years ago

Kenneth Hagesten

2 38 0

Also i have not a auxiliary electric fuelpum. Perhaps it would help if i installed one.

Re: Rotax 912ULS shakes alot at start

by Kenneth Hagesten » 11 years ago

Kenneth Hagesten

2 38 0

I live near the polar circle in Sweden. But i do not fly in minus degrees (Celsius). Cold is 7-3 plus degrees Celsius

Re: Rotax 912ULS shakes alot at start

by Kenneth Hagesten » 11 years ago

Kenneth Hagesten

2 38 0

About 44-37 degrees Fahrenheit is 7-3 degrees Celsius