[Tommy]

Last spring I revived a motorcycle that had been sitting for about ten years. Even with determined soaking and cleaning, some of the smallest passages in the carburetor were not completely clear, so it ran and idled a little rough. I researched the same question you asked and ultimately decided to try a product called Sea Foam. I added it in the recommended amount to the fuel and within three gallons (140 miles) the bike ran noticeably smoother. I don't know if it was the Sea Foam or just running a tank of fuel through the carb that made the difference, but I don't think it hurt anything. ... You may hear lots of strong opinions about additives, but I doubt you will discover any objective evidence supporting them.