Buddy of mine is starting his motor swap and is putting a 300EX motor on a Baja DN 250. This is probably going to be a slower build but should be done ina couple of months and shouldnt be near as complicated as my 400cc swap.
Got the 250/gearbox and upper cradle out last night and next is to flip the axle and swap positions with the sprocket and brake rotor and then hes going to order some parts for the 300 like cam and rings etc. Biggest pain i believe is goin to be building a shifter/clutch setup and figuring out a throttle cable.