i have recently bought a yzf750r started no prob rode it back 75 miles following morning non starter have had the carbs checked cleaned and balanced bike then started three hours later restarted bike no probs left running for two mins turned of then started again following morning no prob later that afeternoon wouldnt start turned over no prob with a putting sound through exhaust petrol getting through no probs there can you help please want my bike back on road