I just picked up a 2000 Scrambler 400 2x4 that has a FMF exhaust and epi clutch kit. I took the clutches apart to clean / inspect them and noticed this kit uses Polaris 10-60 snowmobile weights. Anyone tried the epi belly buster weights? Also the kit comes with epi's orange primary spring, anyone tried the epi yellow spring with a stiffer start rate to bump the engagement a bit more?