I have a 2000 XR650 R. Last summer I did a top-end on it because it was starting to get loud. Unon tearing apart the engine, I found out I had a loose cam chain, and some pretty bad piston slap, along with some valves that weren't seating right. Anyway, I went through there and put in new piston/rings/pin etc, I sent the cylinder off to millenium technologies to have it re-plated, I got 4 new valves, and a new cam chain. I re-used the original springs, retainers, rockers, cam, and decompressor. After I got everything back together, the noise had dropped, but I still have some noise. Whats weird, is that sometimes the noise seems to get louder after the bike is warm, or maybe its just cause I don't hear it when I'm riding. Anyway, it doesn't really go away after the bike is warm. I was told by a tech that it might be my auto decomp system going out, but he didn't know. The noise sounds like a ticking noise coming from the top end, and it increases/decreases w/ engine speed. Has anyone had this happen to them before? Anyone have any ideas? Also, can I take the auto decomp system off the stock cam, and will it still run just fine? I don't care about the starting; I use the manual decomp for that anyways. But, will the bike run fine w/ the auto decomp removed, and is it a chore to get that off? Thanks.