Rotax engine registration check
Here is a website where you can type in your engine serial number and it will tell you if it is registered. If it is great and if not either call the aircraft MFG or your regional Rotax Service Center and get this done.
http://www.rotaxflyingclub.com/registration/engine
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell