I was measuring the valves on my 2007 YZ450F this morning and saw that the exhaust valves were a bit out of spec. The intake valves were fine. The exhaust valves, according to my manual are to be about .25, and mine were at .17. I had a 170 pads in there, but what number pad should I get to put it back in spec? I have asked every mechanic I know, and they said to just toy with it and see what happens, but I dont want to tear apart the bike just to see what will work and what wont, plus those things are 6 bucks each!!!! Thanks for any info you can share with me.