Ok so I've noticed with my 09 450 XCW that when I stab the throttle regardless of whether it's cold/hot I get a short cloud/puff of black smoke. From what I understand that would be indicitave of a rich condition, right??? So thinking that I moved the needle down 1 position/clip up 1, that I believed would lean it out. Well after doing that it changed nothing, but I will say regardless of this rich condition the bike runs awsome. I'm just thinking if I could clean up this issue ie;get the jetting right then I would see a small improvment in how the bike is running. So what I'm looking for is some guidance on what could cause this and what I should do to clean it up? Again the smoke is black, not white or blue as those to colors mean different issues all together.