I'm rebuilding a 98' YZ400F. I've reached the point that I'm assembling the head and needing to put in shims and lifters. Now the head is off of a 00' WR and there were no shims with it when bought. I also only have 3 lifters from the old YZ head. So my questions are which lifters do I purchase(Yellow or Blue?) and where should I start shim wise? I know what the valve specs are ,but what do they come with stock?