This is an 09 yz450. The bike has a LOT of hours on it with no valve adjustments. It is pretty damn hard to start so they are finally being done. Here is what I came up with. Looking from the back of the bike forward, the intake valve left to right are .077, .077, and .127mm . The .077s I am unsure of, the smallest feelers I have are .004" (.127mm) and they would not fit so I am assuming .05mm (.002") would fit. The exhaust left is .203 and right is .152, yikes.... What does it sound like..?