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It's next to impossible to change the engine without changing the transmission unless you have SERIOUS machinist skills, as you know. They share cases, the crankshaft gear drives the clutch basket in a nice bath of shared oil, etc. I imagine it is possible to cut the existing motor out and machine the new one to bolt it, but it would be a complex undertaking.
An easy alternative would be to ditch the transmission and get an automatic variable speed belt drive (CVT) setup and drive the final drive (chain) off that. They are about $150 and work quite well.
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