The PO said the cap was from a Suzuki. I was wondering if that may cause problems since I've seen on some forums here that the stock cap makes a seal and has some vent system. My cap just sits in the hole and no seal. Having issues with not being able to open full throttle and has a misfire running up through the gears. Sounds like its not getting fuel. I have adjusted the AMS and coasterd, cleaned the carbs and put iridium plugs. Idles great but just skips as you go through the gears and can't go full throttle. Could this be a cap problem?