Try http://smallenginewarehouse.com/. No other motor will fit plug and play exactly like the Onans but the kits work well. Roger
I vote chevy small block...You can "make" just about anything work---but it ain't that easy.Wiring,shaft size,etc.
Wow! 990 dollars!I haven't tried these short blocks but they might be worth looking at.
Yep, it is a lot of money to throw into an old tractor but you never know who will be willing to pay it.Wow! 990 dollars!