Originally Posted by
swampthang
Hot Rod 250sx... the idea has pasted my mind a couple times. Its fun to build a machine that's kind of a sleeper. Yes there are lots of ways to hop one up motor wise but in the end your left with a heavy machine with limited handling and an empty wallet. One other mod for speed that hasn't been mentioned is changing the primary drive gears. guys take the primary drive gears from 250es/sx and 300 fourtrax and put them in foreman 400/450 for a 14.5% gear reduction. Havent heard of anyone trying it but if you could fit foreman 400/450 primary drive gears in a 250es/sx case then you would gain 14.5% higher gearing for more top speed.