Your fuel tap/valve works by vacum, ie the suction of the engine opens the tap and lets the fuel through. check the pipe that is attached to the inlet manifold between the carb and the engine. take of the pipe an suck on it, you should hear a click from the fuel tap as it opens. you could try sucking on the pipe whilst turning over the bike, but make sure you cover the hole in the inlet manifold first or it will suck in to much air and wont start. check the pipe for splits or cracks and that it is not crimped in any way
Gordon Richards, October 2008
