So after about 2000 miles on the new clutch, its starting to chatter only when cold. And only the first few engagements. It seems to be supper grabby when cold too. Once I engage the clutch a few times, the chatter goes away. When the car is warmed up, the clutch is smooth as silk and like butter. Feels like an automatic. I took the inspection cover down and everything is bone dry. So I don't think oil contamination is a factor. I also thought maybe the pilot bushing got loose and spun? But if the pilot went bad and wasn't supporting the input, wouldn't it chatter all the time? Im thinking maybe the disc is glazed over a little? Maybe try doing a couple holeshots to try and de-glaze it?
Pull inspection cover, have someone disengage the clutch and spray a bunch of brake cleaner, rotate the engine and repeat. (do all those "safe" things. chocks, jack stands, scoot your butt out from under the car during the "rotating" part and wear them eye protections!!!) That will get any possible greasy monkey thumb prints and what not off the disc, flywheel and pressure plate surfaces. Even if you cannot see any "evidence". If it is still chattering, before you do the "burn off", double check the pushrod adjustment, the fork, release bearing and fork ball adjustments, just to be sure that is not contributing. I never had any luck with "glazed" disc or hot spots on the steels, by any hard launches or anything short of resurfacing. But that was 40 years ago experiences/materials.
After many more miles and testing, Ive determined that it had to be humidity/ dampness issue. The chattering had disappeared when the hot humid weather ended. The clutch seems to like the cooler, dryer air. We'll see if the problem returns with the warm weather in a few more months.
