My Tuono is experiencing some problems and Im not overly convinced about the reasoning that I have recieved from the shop. The bike will be running fine then all of a sudden it gets sluggish and loses power. However, If I am in higher gears, it then starts to surge and regain power then it will lose power again. The red warning light comes on and then on the Tuono Display the word Service comes on and basically the bike wants to shut down. It was taken back the first time and I was told that the temperature coolant sensor was faulty and needed replacing. That was replaced under warranty. I rode the bike home and it was fine. The next itme I rode the bike was to the service station where I filled up with Premium unleaded. When I went to start the bike, it would not start the first go. I turned it off then turned it back on and it started. I rode to cricket trianing and home without issue. The next day when I was commuting to work, it started doing the same thing again. I took the bike home and it was picked up by the shop. Two days later I get a call saying it was ok to pick up. There was some gunk in the Carbys and that was caused by the premium unleaded petrol and that I should run it on normal unleaded for a while until the carbys can dry out. I put it up on the stand today and noticed a small leak in the exhaust where the joins have been welded. The stuff coming out of the leak was black. I have no idea what it is, but could this leak be helping to cause the problem. I tried putting a hose in the tank to drain out the premium unleaded, but cant get it flowing properly. Any suggestions? Thanks for your help.