To remove the high gear bearing, the case should be heated to 200 degrees. This takes longer than you might think, as the aluminum dissipates the heat so well. I went round and round with a propane torch, continually testing with a 200-degree temp stick. Finally, after at least 15 minutes, the temp stick melted, and you could just about push the bearing out with your fingers. Same thing on the way in, and cool the new bearing in the freezer. Fashion a drift that's the diameter of the outer race to tap it in.
'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.