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My tw125 has done 23,000 miles and is used during May to October on a daily round trip of 16 miles with some rest days. Occasionally, when I park it on the stand before trying to start it and open the fuel tap, there is a discharge of liquid from a drain tube behind the engine and in front of the rear forks. The liquid seems to be oily water. When this happens, the bike is impossible to start with the self-starter but can be bump started often with some reluctance. I am guessing that the liquid comes from the emission separation box which receives crankcase vapours. Perhaps this liquid syphons off when the separation box is full. Perhaps also some liquid finds its way into the carburettor and this is hindering ignition. Please can anyone advise me as to what is happening, why, and what to do about it? Thanks.