Generally, with a clutch of that type, you get lower engagement speeds and generally faster acceleration, however, you get much, much shorter belt life, but in my opinion, some kick ass 800 miles vs. normal 1500 mi. is an easy determination, and whats $45 for a new DYNO-MAX 2?
the shorten the life if they do anything, becuse they run so much spring rate. I will tell you what, you send me the 250 bucks for the clutch the 80 bucks for the helix, and 100 bucks for there kit to fit your sled, I will send you a kit that will be just as nice on the trail and pull better top end, or mid range or low range, where ever you want it, and send you a check back for 230 bucks you can use for gas. they are a gimmick. yes they work for ditch riding and sno-cross, but to spend that kind of money for a trail sled, I used the same studs they do on the race track and my sled didnt get any faster, why not, racers use them, well ya i had to pay more than a regular stud but they are supposed to be better. if you are using a dennis kirk book get the epi kit and you will be that much richer and just as happy. or call epi and choose one of the three levels of kit that they make.
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