Epi sells a sport utility and utility clutch kit, 4 stock tires on my 08 sportsman 500 efi. Is the calibration already perfect from the factory or is there room 4 improvement? Would this b a waste of $ or beneficial?

 

I installed the EPI sport/utility stock tire kit on my 02 700. I thought the engagement of the Orange primary spring it came with was a little high and abrupt so I ordered a drk green spring. Acceleration is much better, it pulls consistantly through the poweband, no flat spots. Backshifting is much quicker as well. From my perspective, worth the money.

Hopefully EPIChad will respond as he helped me a lot.

 

Decent kit but I like the Dalton better but it is more costly.
For a quick shot try a Polaris white aka 400 Scrambler spring