Karl, another 2 cents for you; Fuel on this bike is pulled by gravity, no pump. Inside your petcock there is a diaphragm, when the bike runs, or attempts to, vacuum from a line pulls the diaphragm open and allows fuel to pass. Of course, check the line to insure it is connected properly. Next, bypass the petcock. Disco the main line that feeds the carbs. You will need to supply that line directly with fuel. You dont need something as elaborate as this, but a clean cup fitted to the fuel line will work just fine. This will determine if there is a fuel delivery issue with your petcock.