Hello i am a new owner of a 2008 kfx 450 and she is all stock. when riding it yesterday i opened it up and when i went to slow down and pulled the clutch in, it just killed on me. The guy that was riding with me said that when i got on it, I had black smoke coming out of the exhaust. I am thinking i am running rich, but could be wrong. Has anyone ever had this issue or came across someone who did? thanks in advance.