I have an Indy Trail 500 fan and looking to upgrade the stock clutching. It has a red/white primary spring, stock weights, stock 36?? helix with red secondary in the second hole, 96 studs. I'm just looking to get it to run the best for what it is, a 500 fan. It's my backup sled when the wifey wants to ride my 800xc :no_bashing: .