I wanted to give a review on the coop45 mod 3 on my 2016 grizzly 700. Arnie was very easy to work with after emailing him to get the info that I needed to proceed. I ended up ordering a new sheave from him so I could keep the stock one. My set up ended up being modified sheave and orange epi secondary spring and stock weights. He told me I would get all the low end back and no top end loss. His set up did exactly that. I am very impressed with his work and the service and info I got from him . I asked all the questions from low end power to top end speed. The answer was use the parts the he selected for the low end and if you want more top speed add horsepower. It was about as simple and straight forward as it gets. So if you want to do clutch mods go coop45 custom clutch mods. Good luck getting service and info from the other guys like Arnie will give you. Satisfied customer here Thanks Arnie
I too had an excellent experience with Arnie and theroughly enjoy the benefits of my machined sheave!