This is the first Polaris RZR RS1 clutch kit on the market that includes adjustable weights and a helix. With hours of testing, we have found that the factory Polaris clutching is very lazy. With our adjustable weights and helix we can wake up your sluggish Polaris RZR RS1. The helix is a straight 47 which we found is the best designed helix for belt grip and quick rpm ramp while still allowing shift out on the top end. Mix in our adjustable weights and the customer can directly dial the machine into peak rpm (8200-8400).