I have been reading early posts about the mixture screw in 05 WR 450. I have been told that with the free mods done, I am probably running a little lean. However, the manual does not list a "mixture screw" in the carb diagram. Can anyone tell me what the part would be called in the manual so that I can change out to a zip T. Is it going to be difficult to get to? Help with location and diagram would be usefull too.