Came back through the snow (grrrr!) today to find the following on the porch: Tusk dual-sport kit with a total-loss battery and full set of LED lights, all necessary switches, horns and the like to make the KDX truly street-legal. I also ordered a Pirelli MT43 DOT trials tire and an HD tube for the rear, as the meat Jackpiner57 spooned on about 5 years ago was dry and chunked pretty badly in my wholly illegal test forays last fall, although there was plenty of tread left until the knobs started peeling off.
I'm reluctant to take off the pipe, although I have the stocker. The KDX runs well as it sits. I had a good conversation with BigE, my mechanic and guru the other day. I've heard plusses and minuses about adding a flywheel weight to an already heavy unit. BigE was completely in favor of adding the weight. His reasoning was that you get to keep the horsepower that the reeds and pipe give, while the additional flywheel weight calms down the hit and makes the bike more tractable in real-world riding conditions.
Another option would be a Rekluse clutch. Hmm. The Steahy flywheel weight is around $125 shipped. The Rekluse is four times that, and I'd have to re-learn my riding style. I can feather a clutch. I grew up double-clutching farm trucks that were way beyond any reasonable service life.
I picked up a Giant Loop Coyote for luggage in the Fall. Because of the limited range, I don't think I'll take the KDX on long trips, but I'm very excited about taking it out on weekends.