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I have read over a couple of the forums on here that include some clutch modifications done on the Kodiak's. At the moment my quad contains a sheave milled by Coop, a Purple Secondary Spring and 18 Gram roller weights both by EPI. The results are nice, the RPM's at cruising speeds are a little much but something I can get used to. Besides the point, I was viewing JBS's Performance packages which looked to include a new sheave, OD Weights and spring of your choice. I am wanting to know if you guys happen to know the true differences, advantages or disadvantages to OD Weights vs. Roller weights from EPI, Coops sheave vs JBS Sheave. Is there any performance differences, top speed differences or so on. Right now my quad under full throttle on a stretch with 190 pounds on it will hit 58 MPH. I have seem some higher and some lower results from other riders on the Internet. Basically just looking for an overall input from other people with more experience. Thanks in advance!
 

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You did quite a few changes to your clutch already, what was the goal? How would you compare to stock?
By OD weights I believe you refer to the Dr. Pulley weights. I replaced my stock round weights with Dr. Pulley and the end result was a gain of about 5 MPH gain for the top speed . I clocked it with the GPS at 66 mph up from 61 with stock weights.
 

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You did quite a few changes to your clutch already, what was the goal? How would you compare to stock?
By OD weights I believe you refer to the Dr. Pulley weights. I replaced my stock round weights with Dr. Pulley and the end result was a gain of about 5 MPH gain for the top speed . I clocked it with the GPS at 66 mph up from 61 with stock weights.
The main thing I noticed when I bought the machine is that it lacked the punch from a cruise or a hole shot when you pinned the throttle, which was expected from what I read. I wanted to get the quad to launch a little better, be somewhere near its "power band" if you will, when I was cruising so when I nailed it from a cruise there was no sluggish, unresponsive feel. I can't really compare the top speeds from stock until now, because I didn't top the quad out before doing the mod to it. By no means am I displeased with the outcome, I think the set up was created in my head with the intentions of a lot of mud riding, which I don't do much of. I tend to ride more trails more so then mud. The Kodiak only has 27" tires so it's not having to turn a big mud tire. I just wanted to see if the outcome of cruising RPM's and performance from JBS could be comparable. I have heard a lot about them!
 

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I personally don't care much for high speed at the top end, as my riding is all trail raiding. Not a big fan of the mud either. As of right now I am on stock tires and there may be a big difference as I see you have 27" tires. That may throw your speedometer reading off and definitely are heavier and harder to turn than the lighter, smaller OEM tires.
I have read good things about Coop sheave mod and that should help your case.
I feel the same sluggish half a second when I open it up but I thought that a fuel tuner will resolve that - at least based on other users reports. Did you contact EHS and ask them ? Maybe there is something they can help you with. I was really considering this mod, now I'm having second thoughts.....
 
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