Ok heres the scoop: when i bought this bike, the guy told me it was a 2001, mentioned that it had titanium valves... I reshimmed the valves, wouldnt start, so i pulled the head to inspect. I did some reasearch on the VIN number on the frame and from my understanding its a 2000, not a 2001. All of the valves on the bike are original except for the middle intake valve, which looks to be titanium, and its much lighter than the rest. Could this be a problem? having one titanium valve and the rest stainless steel or w/e theyre made out of? Oh and by the way it turned out that 3 of the valves didnt have the keepers locked in place, i guess giving me innacurate readings? I hope this is comprehendable ha.