helix

Hey guys, i have searched through this whole website and haven't found exactly what i need for information, i have a 2014 mcxpress 270 turbo yamaha nytro mtx se with a 153x2.5 challenger extreme track with 20/40 gearing that i have spent a ton of time trying to tune these clutches and have yet...

I'm running TD powertrail, ulmer primary spring, stm weights, stock secondary spring with a 35/39 dalton. I'm not sold on the reverse angle and feel there may be something better out there. In my SRX days we always ran 3 or 4 degrees higher than stock start to 3 or 4 degrees lower on finish. I...

We have developed an all in one speed upgrade for your MPI 190 turbo SR Vipers. This kit includes a new lower gear, hyvo chain, machined helix with overdrive acceptance, secondary spring (set at 3-3), and secondary washers. We have seen drastic improvements over stock gearing/clutching as this...