Engine shut off

What Engine?

I had exactly this same problem. The reason turned out to be one ignition wire to the key switch had broken, so when I turned the engine off only one ignition was grounded thru the switch, the other stayed hot.

Its the Rotax 912 ULS.  Thank you James.  I'll have to take a look and see if that is the issue.  Bill if you have any other ideas on what it may be or what to check, I'd greatly appreciate it.  

It could be a bad ground wire. Could be a lose screw on the back of the ignition switch or a bad connection in the engine compartment on one of the white wires out of the ignition module plastic plugs. May be hanging by a thread at the metal connector inside the plastic plug. Just take a few minutes and check them all..

Thank you Roger!