I felt I cleaned this carb well about a month ago. I used Berryman’s carb dip, carb spray, compressed air, and wire (for the tiny port near the jets). I also drained the tank and put in fresh ethanol free 91 octane fuel. I don’t know what this crystalline stuff is, especially developing in such a short time. The main jet had a big chunk stuck in it, so that explains how it was running. Anybody have a good idea what happened here and how I can prevent it happening again?