I doubt it since the frames are vastly different... you'd have to chop the frame up pretty good, or maybe make some wild motor mounts. Keep the 92 CR together if you can... although, I have an old 1976 RM frame that it might fit in to, hahaha!
Why not sell your 92 CR250 engine and then look around for a 1990 CR500 engine on EBAY or in the salvage yard? Maybe a salvage yard would trade you for your engine plus some cash.
Possibly a cheaper/better solution than giving birth to a b@$tard bike.
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