From previous reads, I understood either the flywheel ring gear is different, or the starter gears are different for 6v vs. 12v. The engine I ordered came with 12v starter and generator (Chrysler!!). I ASSumed the ring gear that came with the engine was for the 12v starter. I tried reverting back to my original 6v starter and generator but incurred very slow cranking and super-hot starter. I was lucky to get it fired up just once. As above, I replaced with new thicker cables. Got fed up and put back on the 12v. Now engine fires right up and runs every time.
