This B&S video has some graphics on a V-Twin lubrication system (they don't say which one). Don't expect to learn a lot. It's a PR video, not a true technical one. It looks like the pressure lube goes to both crankshaft bearings and the heads in the vertical shaft engine shown. It's not clear how the camshaft or wrist pins get oil. I'm assuming there are some complete technical manuals for these engines somewhere. My local library has only the most basic material, and the B&S manuals online are primarily very rudimentary manuals for owners (how to check the oil, etc) or parts manuals with exploded diagrams.