I was working on my bike today and noticed that there was little black chunks of stuff on the sides of the overflow bottle. So I took the radiator cap off and the same chunks were on the cap, it almost looked like the rubber on the cap was coming off in tiny chunks. About 3 months ago I put a bottle of water wetter in, did this cause the problem? My raptor is about 1 1/2 years old. Any body ever had this problem, or heard of it?