So until today my bike was pretty solid. It started up fine this morning. I drove myself and my girlfriend to brunch at a restaurant. Then it started up again just fine after we were done eating. Dropped GF off at our apt, then got back on the road for a 3-hour ride.
After riding for an hour, I stopped on the side of the road to take a scenic picture. I started the bike, put it in 1st and eased on the throttle while easing out the clutch. As soon as I let out a bit of clutch, it STALLED. It didn't lurch; it just died. I started it up again, making sure the kickstand was up after opening the gas cap to clear any vacuum. Started fine, revved fine. Eased out the clutch - STALL. Again. Eff me.
I happened to be on a hill at the time, so I figured I would try rolling it into 2nd. I start it up, get it rolling down the hill in neutral, shift up to 2nd, then let out the clutch:
Well it stayed running, but any throttle input just made a "whooooom" sound. No power, no rpm change. Eventually I got to the bottom of the hill and the engine slowly braked itself to a stop.
My first guess is a clogged float valve, but that would only affect one of the cylinders. And why all-of-a-sudden after behaving just fine all day? And while I was passing through a state park that was closing in an hour? And in an area with no cell reception?
Any suggestions before I tow the bike back to the garage?