i feel the fouled plug. i just changed the plug in my 79 motobecane. you would not believe how much more power i could feel once i did that. i have only had the bike for like 2 months so i dont know how old the plug was, but personaly i had put at least 500 miles on it. once it was changed out no problems at all. bjerg, what set up are you running? is your bike all stock?