Hi guys I recently got 2009 kx 250f monster edition. The guy who had it before me didn't ride it much.so its in pretty good shape.starts 1st kick but when I take the chock off its dose not like to idle but soon as motor worms up a bit it idles fine.and some black smoke comes out from exhaust when it's cold motor.sparck plug was a bit back when I took it out. Thanks for any help I can get

 

Sounds like running rich... Why idk.. If your choking it to long that can happen.. Or if your air/fuel mix screw isnt adjusted.