Rode the bike going well. Put fuel in and rode another 30 odd kms then sitting at a set of lights just tapped throttle the engine died. started first go and kept riding. From then on started to sound flat like a 2 stroke with to little revs and found myself with a flat spot and having to ride like a 2 stroke. This was about 11:15 last night. Any ideas whether it could be dirty fuel or something else like flattening battery odr even blockage in the fuel lines. After some advice as need the bike as a daily. Cheers in advance.