I am having trouble getting my clutching dialed in and am thinking maybe a different helix might be what I need. I have a 2013 Sportsman 400HO. I have installed a piston (.060 over 500 top end, 515cc 10.8:1), Web camshaft, mild head work, BSR42 carb (predator 500 carb), Custom snorkels (dual 2 inch to airbox), and exhaust, Ritter cycle lightened flywheel,

The problem Im having is over rev off the line. I have tried changing springs and weights and I either end up with a good pull off the line followed by the rpm dropping too low above 20mph, or hitting the rev limiter off the line and good rpm above 20. Basicly it seems its not upshifting fast enough in the 0 to 20 range. Im trying to keep the rpm around 6700-6800. I installed some 10MH weights and they were really good up to 20mph but then dropped down to 6300 by 45mph. The stock 10WH weights over rev badly up to 20mph but then seem perfect for the rest of the pull. Basicly if I get it to not over rev off the line its too low up top and vice versa. I have the stock button secondary with stock helix (5131446 straight 40 degree) and secondary spring. Primary spring is an EPI Red. Im wondering if the Sportsman 500 41/37 helix would help fight the RPM drop with the 10MH weights. Let me know what you guys think

 

You're running basically at the rpm limit(6900 rpm soft limit,7050 rpm hard limit) as the manual says. A 500 stationary ramp(helix) would probably fit from the same model,but as to whether it might help..Might be a good idea to give the guys at Dalton,Epi or Highlifter a call on what they'd recommend with what all you've done performance wise.Even an aftermarket performance cdi that would help on the timing curve might help that are listed on Ebay,etc.