The '91-'94 kdx250 sold here in the USA was basically a mildly ported '88 KX250 motor with wide ratio tranny, thicker head gasket, heavy flywheel and lighting system. I think an '89 KX would interchange as well, and possibly '90 and '91. I've never heard of anyone making the swap, but I my guess is an '88 KX250 motor would drop right in.
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