Well, after 3040 miles and once a week trips to the track running high 9's, my '06's stock clutch finally gave up the ghost. I thought that was pretty good though, considering the hard riding. What kind of mileage have you guys who drag got out of your stock clutches?
I doubt it is hurt too badly. Mine wasn't. Mine started slipping after 8500 miles and 100-120 passes. Pull it apart and check it with a micrometer or a caliper. The outside fiber and inside fiber are ticket. There will be 9 steels, 2 are .010â€ thicker than the other 7. Have all the steels bead blasted. Check for thickness. From what I can find out the optimum stack height is 1.95-2.00 with most preferring to get as close to 2.00 as possible without going over. The service manual shows using up to 4 thick steel plates. There is no reason you canâ€™t use all thick steels if you donâ€™t exceed .200 totals.
Springs, buy another set. The stock ones in mine dropped about .050-.060â€ in height. Putting them on a spring pressure checker and checking them at installed height showed a drop of 4-6lbs per spring. 30lbs total. I think that is where I started slipping.
I built a new stack to put in mine. I intend on pulling it and checking it every 40-50 passes now and putting in a fresh set of springs.
But doing a clutch rebuild isn't really an easy thing, is it? I've taken my bikes to Johnny at Exoticycle in Sarasota, because I know he knows what he's doing...Is messing with your clutch really a DIY project? Especially if you're trying to pound it in the 1/4? I'm not saying I wouldn't try it, it's just that I always thought it was over my head, and I'm pretty mechanically inclined.