I have a 98' YZ400F with a 00' WR head. Now my questions are what color lifters fit what? A 98' YZF has blue or yellow lifters. A 00' WR has blue, yellow, and black. That is all the info I get from OE parts descriptions. My manual has no info about which color is for either intake or exhaust. Another question is which cams to use? Is it smarter to use the WR cams with the WR head or use the YZ cams with the WR head? Or do the cams have the same specs and it really doesn't matter? A little help please. Thanks.