Hey, I was wondering if anyone out there is having the same problem as me and if anyone knows of any remedies for this problem. I have a highly modified 2007 YZ450F (HC piston, cams, ignition, pipe, etc) and I cannot keep a clutch in it. I am aware of the pro circuit stiffer springs which are available, which I have already ordered to help the problem. However, the weird thing about this whole issue is that I never had clutch issues with my 2006 YZ450F. I went the entire season on 2 sets of clutches, but last year I needed a clutch every two races and I am anticipating the same problem for this year. I know from 2006-2007 they went from 9 fibers and 8 steels to 8 fibers and 7 steels and they also changed the pressure plate and hub to accommodate this difference. I have heard of guys actually having their hubs machined to help the 2007 clutch because the problem seems to be that when the clutch gets hot, the hub expands, causing the gap between the pressure plate and the outer most friction to get bigger. This results in not enough pressure being applied to the plates which causes the clutch to begin slipping. This quickly results in a fried clutch. The mod that I heard of a couple guys doing basically decreases the gap between the pressure plate and the friction, resulting in more pressure applied to the plates, even once they become a bit worn. Has anyone heard of this mod and its validity or any other mods that might help? Should I just go to a Rekluse clutch or will I have just as many problems...? Does anyone have the answer??