Since all the engine intake air on a 2-stroke usually goes through the crankcase, and the piston back-stroke compresses it in the case to inject it into the cylinders, there's usually a pretty good airflow through there and a pretty good pressure cycle. Quite likely the governor could be an airflap (or more likely a piston/diaphragm?) on the inside. It would be expected that inside the crankcase it could produce a pretty hefty push on a stiff external linkage.

In most conventional (automotive) rigs I've seen the rectifier is about as close as possible to the alternator, and usually mounted directly on (or inside) the gen case. In older auto alternators, it often was two or three diodes pressed into separate holes, and there wasn't a single "rectifier" part bolted on somewhere.

Have you tried the local library for obsolete engine manuals?

John