The fuel bowls on these engines are extremely efficient at causing condensation and fuel breakdown. I would chalk it up to a combination of airspace, an aluminum bowl and it's inherent rapid heat transfer characteristics, and I wouldn't be surprised if some dissimilar metal voodoo had something to do with my bad fuel. If memory serves, there are at least three different metal / alloy types within an inch of the bowls - the aluminum bowl, brass jets, & steel springs and parts, and maybe even some stainless in the bowl screws? Just a theory...
Due to my schedule last Summer riding herd on Gus Boy, I had the bike parked for two months. It wouldn't start right, and so I drained the bowls. The fuel was visibly off color, had a wrong odor, and a few drops of water & algae were swimming around in there too. The source fuel was no more than 3 months old in the tank.
Not that you asked, but, if a length of tubing is not at hand, a cut down plastic soda bottle can be helpful in draining the bowls. Pour the nasty fuel into a whole / uncut capped bottle, and it's good to go to the waste oil tank. Gravel driveway dandelions like bad fuel too.
