the thing is with bike carbs they are proned to water i no you said you stripped and cleaned them unless you blow through every piece wit an air line when you give it the gun the water gets sucked up the jets but cant go through when you back of water being heavier than petrol drops back down only takes a bit or missed a bit with the air line i got a zzr 1100 had to clean them twice try new plugs as well they dont like loads a fuel ray