Last week I purchased a 52 inch Scag TT with a 22hp kawi liquid cooled. So far I have been impressed with the cut of the Advantage deck, but the engine began to sputter and pop with only 1 hour on it. I took it to the shop where they cleaned the carb, flushed the tank, and replaced filters at no cost. They determined that the unit had been on the showroom floor for a while and that the fuel went stale. This unit now has 10 hours on it and is beginning to sputter and pop again. I have a 17hp kawi on a Hustler Shortcut that has given me constant trouble since day one. Does anyone have any suggestions on a way to hopefully solve this problem, or is this just typical for Kawasaki engines? Any help would be appreciated..