older cat 98 zr 600 efi it's got a 136 2in track on it just been playing with the clutch I bought the clutch kit when I had a 121 zr 600 i think it's all wrong for off trail. came with a 60/48 helix hits good on the bottom just dont like how the mid is hitting I think thats when it's on the 48 part of the helix so I put a 53 degree in it and a purple spring we'll see tomorrow got it to engage at 4000 rpm used to engage at 5200.I think i'm a little over weighted for off trail also. stock weight is 49.5 But i'm still hitting 8200 rpms I'm pretty green when playing with the clutch LOL.