Rotax 912isc 3 sport -Without Governor

Great Question!

However, it's crucial to emphasize that the governor pad cover plate is NOT intended for use during flight; it serves exclusively for shipping purposes.

Prior to commencing engine operation, it is imperative to remove the governor pad plate cover. Afterward, you have the option to either install a governor along with a constant-speed propeller or proceed with a version 2 conversion.

For detailed information, please consult the SI-PAG-002 document available at this link: SI-PAG-002

Just an add on to what Rotax Owner has said.  In the past Rotax had an option to use the version 3 shaft with the governor pad blocked off.  Oil would still come from the oil pump and fill the shaft.  The version 3 shaft has one tiny hole in one of the splines on the propshaft that is therefore lubricated by the oil pressure within the bore of the prop shaft.  The bearings are lubricated by the oil vapor inside the gearbox.  The issue here is you must block off the propshaft end or all your oil will dump on the floor.  There was a modification you could do to the shaft, it was called a version 4 configuration.  The change was a small frost type plug inside the propshaft that stopped oil pressure pumping out behind the prop hub.  Rotax has discontinued this and no longer offers a version 4, they want you to reconfigure to match the prop type you are using.  (oil or no oil in the shaft)  

As noted by Rotax Owner the pad as supplied by Rotax was intended as a shipping/test plate so you could select your govnor supply to match your prop.  If you were to run that in flight it is not tested for that by Rotax and you need to block the oil from coming out on the propshaft end. 

Cheers