Is this a dirtbike issue, or ALL motorized vehicles? Having been there, seen it's crystal-clear waters, and heard from some of the locals who remember cleaner waters, I think they ought to ban motorized watercraft and boats first. The waters of that lake, being pure runoff, are being destroyed by the 2-stroke and large boat engines dumping pollutants into the lake. Dirtbikes the problem? I didn't see any evidence of it. What damage could they possibly do, knock down a tree with your 250? I don't think so.