Hello all, first post here. Just recently after a break from riding that lasted about 3 years or so, I decided to jump back into it. I have an '04 YZ450F and an '06 YZ250. I decided that before I started riding the 450 again, I needed to check the valve clearances. The two exhaust valves are about .18-19mm. Just out of spec. All three intake valves were in the .10-.15mm range so I'm good there. Now, I have never done any kind of valve work on anything so I'm probably going to sound like a newb. It would seem to me that I would need a smaller (thinner) shim to increase the distance between the lobe and the bucket and get it back up into that .20-.25mm spec. Am I right or wrong? Also, what shim kit would you guys recommend? Thank you.