Well, my shee already had a pvl ignition setup on it when I bought it, so I'm not sure what it's SUPPOSED to look like. I'm coming off a yfz450. I took the side cover off to switch my 13t sprocket for a 15t. Well, once I got it off I noticed some metal shavings and was like WTF? I look down and the nut is just kinda hangin there on the end of the stud that everything mounts on. Shavings were from the inside of the nut gettin wallowed out by the shaft it's supposed to screw onto. Shaft is fine, it has a tapered no thread spot on the end. I KNOW it was supposed to be there at some point, but is it supposed to tighten down when the pvl stuff is in there. I'm not sure.. It's kinda weird, there's no flywheel, so who know?? LOL I'm just surprised that if it IS supposed to be there, nothing has came apart yet. LOL