Hi i have recently got a yamaha bws and i have encounted a problem with it! i have taken the bike to bits so far and have managaed to bring the problem down to two things that i think have gone wrong and they are either my carboretor or my diaphragm in the petrol tank. What seems to be happening is that fuel isnt getting into the carboretor from the fuel tank in order for the bike to keep running. But when i bypass the system and pour petrol into the piston itself the bike will kick over but not keep running for longer than about 3 seconds. Can anybody help me with a possible solution that may help me fix this problem. Thanks