If the bike has been sitting a long time, fresh gas is about the best thing you can put in it. Most of these magic potions require you to run the bike for a while to get the effect, which is the same effect you get if you put in fresh gas and run the bike for a while. If you let it get up to temperature, and run it for a while, the engine cleans itself. That's the instructions on all the mechanic in a bottle products people claim cause the bike to run smoother. So you're adding money to the tank and letting the bike do what it's going to do anyway.