Just fitted th O2 Sensor purchased from the Greek guy (thanks for the info Bulldog2) first off didn't notice much difference and then after about 4 miles when the bike had warmed up fully bingo! can now do most islands in second without dipping the clutch, really has smoothed out the bottom end and it also seems much happier going into 5th gear and cruising down to 50mph. I think the ECU needed a bit of time to adjust the fuel injection at start off. well worth the dosh - highly recommended!