I am looking for any ideas for the problems I'm having. My 06 250f was running fine and all of a sudden it lost power and started popping. I have checked the compression, tried a new CDI box, changed the coil, cleaned the stator, changed the plug twice, checked the valves, cleaned out the carb three times, changed the fuel and still no change. Each time I have cleaned the carb and changed the plug it has ran for a short amount of time and then quit. Help!!!!