Well, since I decided a long time ago that the RMX 250 was getting the boot, my father has handed down a barely used late model KTM 300 EXC to me - free of charge! It's an amazing bike with all the nicest bits - including WP suspension and Brembo brakes - but I don't want to ride a 2-stroke. Are any of the KTM 250cc, 400cc, or 450cc 4-stroke engines swappable into the frame of the 300cc 2-stroke??? I really don't want to fire from the hip on this one since it's such a nice bike, anyone know anything or anybody who might? What I really want to do is eventually convert it into a street-legal motard. Thank you.