Man, I thought vintage bikes were unpopular with the general public. But from what I've been reading, the environmental types want the vintage PWCs to just be wiped of the face of the planet. In 20 years, the manufacturers managed to cut emissions on those things by 70%, but the sentiment out there was still negative because of all the older models that were dirtying up the world! At Lake Tahoe, if you want to run something pre-2006, chances are it won't meet the standards. 2006!
Although, I have heard many a story of hot days on the Willamette River where the two-stroke boats and two-stroke skis were all over the place, and by sunset there was a very noticeable blue fog hugging the water. No wonder people got so blood-thirsty about it!