The problem has come up several times at our field. I don't have pics because they are not my engines. I wouldn't own one after seeing how miserably they are to get to run properly, never mind the carb jamming problem. A flying buddy bought one to save a few bucks instead of buying OS and had to replace his trainer after one too many deadsticks. He brought the "new" trainer out to our field and I tried to get to adjust the thing for several minutes. I thought it was good so we refilled the tank and took off. In about 40 seconds after the takeoff, the engine died. My buddy has basically left the hobby after 3 years of trying to solo because of his crappy running engine that no one could keep running. One flyer that was experienced brought out a new sport plane that he had just completed building with a new ST 45 on the front. We usually run 5 tanks of fuel through the engines and then fly at our field. About half way through the 4th tank was when his carb barrel froze! He was surprized and POed. I told him about the carb barrel and when he checked, that was where the problem was. I also ran into this problem on a 75 size engine that I bought from World Models. It took me 1/2 hour just to get the barrel out of the throttle body to repair it. It was worth it in this case beacause at least the engine is easy to adjust and has good power. I can draw up a pic of where the problem occours and post it if you like. After 7 or so years in the hobby, I love to see newbys show up with with TT or OS engines on their shiny new trainers and curse under my breath when I see a ST on the nose! [8D]