these engines are so under tuned its pathetic, get your timing advanced at least 4 to6 degrees and rejet for the little extra heat you will generate. I did this on my 99rmk and am now able to pull 54gram weights, 2"x 136 long track, gear ratio is only 17/41. you wont believe the differance it makes.
My brother-in-law had a 91 indy 500 that he installed fox shocks a pipe and clutch and that thing really moved. At the time he rode it for 4 years and there were not to many guys who could beat him on the trails. He sold it and got a 96 xcr 440 which was even faster!!! Just goes to show you that it not the size but the set-up!!!
A forum community dedicated to snowmobile owners and enthusiasts. Come join the discussion about performance, troubleshooting, trails, maintenance, riding tips, modifications, classifieds, accessories, and more!