to stop a Rotax reduce to minimum revs and then switch off both mags. The engine will stop, if you have reduced the revs as far as possible with less violence than might occur otherwise. With my conventional mag type switch I can go to one mg and then off.
which was post #13 with some typos.
But the critical point is to read the manual and do what your particular engine needs. Lycoming, deHavilland, Rotax are very different engines and should be treated that way - according to their manuals.