I have an 06 YZ450F with 90 hrs of use and I decided to do a valve job. I sent my head off to have the valves seats machined and and new OEM valve components installed. I replaced all the shims to achieve the correct valve clearance and I ended up having to make a bigger adjustment on the intake side than what I would of expected. The stock intake shims were all 192's and I ended up with two 160's and one 165 (.0106in to .0125in from stock). Does this seem to excessive? Is there a service limit and if so how do I check with all the variables?