will someone explain to me the basics of primary and secondary clutch springs. and what upshifting and back shifting actually is in the pvt. i have a 05 800 and am considering changing them, but i dont have any knowledge of clutch systems and how they affect the ride. any info would be appreciated.

 

Scooch, here is a breif run through, Primary spring main function controls engagment and operating rpm. Secondary spring helps control how fast a machien upshifts and backshifts. FYI both the weights and helix angle play a big roll on this as well. What is it that you want to chagne and why? Do you have larger tires or any other mods? We have found that the stk. cltuch on a stk. machine is tough to make any better.

 

thank you very much, my bike is a stock 800 sportsman. my tire choice will be the new ITP radial tires in a 27".would you recommend a clutch change?

 

I'd start with our green primary spring, stk. or slightly stiffer secondary spring depends on tire weight and riding conditions. The stk. weights should be ok.