I used to have a '97 that was pretty gutless before I got rid of it. The cylinders were worn out and i think I was only getting like 85 psi out of each. Barely would stay runnin' let alone rip up some powder once it got warm. Any way, the only major upgrade I did to the machine was a clutch kit from a store off ebay (speed works I think is their name). But the best thing you could to for that sled is drop a '98+ ves 440 or even a bigger domestic twin possibly. Good luck