I am new to the whole cvt quads and am in the process of building a 50cc eton for my son to start racing. I need to find out what clutch set up I need (springs, roller weight, etc). The mods I have done are koso intake, pipe (not sure of brand bought used), ported cylinder, decked head, 21mm carb, uni filter, aftermarket cdi and coil, durablue +4" axle, 16" snow hogs, +3" +2" a-arms. That is about all I can think of that would effect clutch performance. Any help would be appreciated.