I just recently shimmed the valves on my 2008 wr450 and noticed there were some discrepancies between the marks on the crank and the dimples on the cams when finding TDC. After lining up the marks on the crank (via the 2 engine caps), it needs just a little more rotation (~1 tooth) to line up the dimples on the cams so that they're flush with the head walls. The cams are timed right relative to each other but seem to be retarded ~ 1 tooth. I zip tied the cam chain to the intake cam before shifting it out of the way so It must have been done by the previous owner. Could this have been done intentionally? Are there any advantages or disadvantages? Or could it be that the cam chain is worn and should be replaced? I've only had the bike for 4-5 months and have put ~ 15-20k miles on it in that time. oil changes ~every 1-1.5k. It sees as much street as it does dirt.