This is strange. Just got back from the Isle of Man, bike not missed a beat once. Pulled over for a break and after about 10 mins I noticed a brown oily petrol mix seeping out of carb no2 running down onto the generator cover. I rode another 300 odd miles since then, turning the fuel off every time I stopped (which was annoying). I've just taken the carbs off and found the float bowl rubber gasket split on no2 carb but, carbs are clean inside! So what was the brown stuff?? It felt like oil, so now confused!!