I suppose in a crackdown on emissions, all noxious emissions sources should be regulated. It also makes sense to start with the worst offenders... like coal burning electric plants and diesel trucks. And only then move on to the lesser offenders, like cars, lawn-mowers, weed-whackers, leaf-blowers, etc. And then deal with motorcycles wherever they fall in the list of "Worst offenders." What galls me in all this is that the EPA can walk right over us just because we are a minority with a weak lobbying group. Not every senator rides a bike, but I bet the gaping majority hire somebody to mow their lawn and clean up with leaf-blowers. So which do you think will get regulated first? No-brainer here...