I just got this bike yesterday, and am new to the 2 stroke bike world. Seems that I have a "spooge" problem, I'm guessing it's the black stuff coming out of the exhaust and getting on the rear fender. What would be causing this and how do I fix it. I've included a link to a picture of it. http://i918.photobucket.com/albums/ad28/jramsey8258/RM250002.jpg Thanks J.D.