Everything I have tried has not made any difference in the way it is running. So far I have drained the fuel tank and replaced the fuel filter. I replaced the spark plug. I opened, inspected, and cleaned the carb. I replaced the gas cap. I checked for vacuum leaks. I checked and re-checked valve clearance. Nothing that I have done has made it run above idle. It starts and idles as it always has, but just as soon as I give it any throttle is starts bogging down. I have to walk away from it for the day..........just getting frustrated now. I am open to all suggestions.......if there is anything I have overlooked please please please help me figure this out. I have been working on this since 7am this morning and am my whits end. I even swapped out the cdi and that made no diffference as well.