I have an 06 450x. It has about 30 hours on it. After finding this great site and reading the valuable information you guys post. I decided to check my valves. The intake's spec is .16 +or- .03 checked it and was .10 and the exaust spec is .28 +or- .03 checked and it was .23 These are slightly out of tolerance. My question is do I shim the valves to fix the movement? Or would it be acceptable to keep riding and inspect for more movement periodically and replace when they move more? Hey thanks for the great data base to use Thumper Talk!! And thank you all for the great advise.