I heard a similar rumor, but it was ALL 2 strokes by 2006. I saw an article where some states have already tried to pass laws like this. I havent seen any reliable information on the issue yet though. If they try to pass any laws like this around my area,though, ill be taking pics of every '76 caddilac el'dorado that's still driving around burning oil faster than it can leak,and bring them down to the senators office on the back of my shee. The problem here is that with the recent bad publicity that the sport has gotten, theyre killing two birds with one stone here. These laws will get the vote of the enviromentalists, the people against off road hobbies, and half the people who just arent educated on the topic. Sorry about the book, but laws with poor logic like this really burn my a$$