Black smoke when cold but not when warmed up 2013yz250f

[Harshy529]

I have a 2013 yz250f and the last few times that I raced my bike there was black smoke coming out of the exhaust when cold. When the bike warmed up it went away has this happens to any one else? If so what can I do to fix it?

[ronbuell]

Normal.

Black is fuel, when enriching circuit is engaged.  After the engine warms up and you take the choke off, you're good to go.

Black is fuel, blue is oil, white is water vapor.

[Harshy529]

Ok! Thanks a lot I appreciate it. I'm glad that it isn't anything serious