Hi, I was riding my 650l today in the woods and my friend that was riding behind me said that my bike is smoking, Not a lot but it is puffing when I get on it, for the rest of the day i would stop here and thare and rev the bike and it is definity puffing. I dont know wy it is burning oil when the bike only has a 1000 miles on it and i take care of it, i have already changed the oil and filter once and the air filter is always clean and i let warm up every time i ride. I do know i was riding some pretty long second gear wheelies but i dont see wy that would do anything the oil level is at the upper mark but not over, my bike has never smoked before untill halfway through today. Can someone help me figure this out, Thankyou!!!