Its time for some work to be done on the old 650 Indy cluches, the old boy is only doing about 85 mph now. Does anybody have any ideas of what type of springs and wieghts I might use to get a bit more UMPHH out of the old boy? Both primary and secondary! Any ideas would be much appreciated! Thanks , and happy sledding...

Did this sled go faster at one time? If it has slowed down then it probably needs some parts replacement and clutch maintenance more than changing springs and weights. If you have done all that and the engine is sound then probably change the gearing if you want more speed. Go up on the top gear or down on the bottom gear by one tooth to see what it does for you.

Did this sled go faster at one time? If it has slowed down then it probably needs some parts replacement and clutch maintenance more than changing springs and weights. If you have done all that and the engine is sound then probably change the gearing if you want more speed. Go up on the top gear or down on the bottom gear by one tooth to see what it does for you.

Thanks for the advice. Yes it used to get closer to a 100mph (according to the speedo) Its been sitting for a couple of yrs( bad back) Just put a a newer suspension in and still lots of snow left!! Thanks again!!!!