Steve Schroeder Posted April 24, 2019 Report Share Posted April 24, 2019 I have a SportCruiser with a Rotax 912 ULS. I always got a lot of kickback with the prop on shutdown. It shakes the engine mounts pretty good. I try to let the RPM settle as slow as possible with the throttle all the way back before tuning the key to off but I still get the kickback. I stopped worrying about it when someone explained to me it was normal for a high compression engine as the Rotax 912 ULS. Now I m getting a screeching sound as well as the kickback. I have pulled the engine cowling and everything looks good inside. It sounds like a screeching belt on a car but there are no belts on a Rotax as far as I know. Should I be concerned? Link to comment Share on other sites More sharing options...
Warmi Posted April 24, 2019 Report Share Posted April 24, 2019 What I noticed with my engine is that , if I just taxi down to the hangar and then turn off one mag, wait and then another to shut it down, 90% of time it will shut down very softly. If , on the other hand, I do something like a 4000 rpm run up and then attempt to shut it down without idling for a while , I am more than likely to get a decently violent shudder which always makes me uncomfortable - no matter what people say it just can’t be good for the engine. I did get a screeching sound a few times when it didn’t shut down softly - and I also got this sound sometimes when attempting to burp a hot engine - but it seems quite random , I can never replicate it on demand and it comes and goes. Link to comment Share on other sites More sharing options...
Roger Lee Posted April 25, 2019 Report Share Posted April 25, 2019 The shut down screech is normal and usually will go away in time. Make sure you're using the correct oil. The wrong oils can cause this. My CT had it for a while then went away. Link to comment Share on other sites More sharing options...
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