I cant total say thats my own clutch mod idea. To be honest, I got the idea years ago from a dirt bike rider & just converted the idea to the TRX250R.
One thing for sure, it will stiffen up the clutch lever from those springs being stronger & a rider thats youst to blipping the clutch lever coming out of a corner trying to keep the rpms up because they are in the wrong gear, in about a lap or two those blipping clutch fingers will be done.
After that, it wont take that rider very many races before they figure out which gear they should be in to keep their speed up going around & out of that corner.
Last I remember, that full Hinson set up, was around 1000 bucks or more & if you didnt use the oil Hinson recommended, that clutch set up was no better than any other clutch & would soon be slipping just like any other clutch.
Neil