[Saverain]

I was driving it on the highway, kind of pushing it and black smoke started coming out of the exhaust, may for about 5 minutes. I pulled over and everytime I tryed started it it would smoke and then shut down. I left it on the side of the road and had someone pick it up. I haven't looked at it since, but what oculd be going on? I just put in a quart of oil and there was engine coolant in there and it didn't go past 100 degrees on the temperature guage, I put on the fan while riding because it was getting there, maybe I shouldn't of. What should I do to get it back up running?