i bouihgt a used yz450f a while back and havent really rode it only a hour on the meter. it had about 25 on it when i bought it. . any way i check the valve clearances yesterday and im a bit pissed of now. the bike is only supost to have a hand full of hours on it and it was overall clean other then plastics, event he linkage bearings where packed with grease. anyway here is the valve clearances. 0 0 .23 .18 0 0 0 zero .10 .30 195 181 160 shim pad size i have no clue why the orginal owner put these shim pads in but do i have anything to worry about with the excessively large gap (.30mm) in the right valve. the only thing that should change is how late the valve opens right? i doubt i have to worry about piston contact since .15mm isnt that big of a gap but i could be wrong. im just going to order a 175-185 shims and that should get me in the ball park. didnt have a chance to see what the shims where in the exhaust side yet. just venting a bit pissed off that some one is that incompten to set the valve clearance that far off. funny part is i bought the bike from a little racing bike shop that sponsers a few of the local series. and not to mention that the valve caps had to be over torqued i could harley brake the bolts lose with a twrench.