Differences between the various engines:
1. The Cub cranks use a 1"x 2-7/8" PTO end of the crankshaft.
JD and WH use a 1-1/8" x 3-1/4" and longer PTO end.
2. Check the engine tech section of this forum for the differences between
the different Kohler engine oil pan bolt-up areas.
3. The starter/generator engines use a different bearing plate than do the
starter/alternater engines.
4. With a torch, welder, a BFH, and a lot of hair pulling and cussing, you
just might make it work.
(#4 comes from personal experiences!!)
Happy Cubbing!!
FFGino.