Herman,
Not an answer to your direct question, but possibly helpful, a local guy with an early 912ULS with nearly 1500 hours on it developed a starting routine that works for him. I use it on my 80 hp and it results on easy quick starts with no bouncing around.

He will start with throttle full closed, Ignition off, Crank for about ten seconds with full choke. Rotate throttle to an approximate fast idle. Ignitions on and crank again with full choke. Presto. I don't think he has yet to install the aftermarket - for him - Sprague Clutch.