Right, 3 weeks since last flight... it should normally be impossible to start without removing and cleaning excess oil from the 4 spark plugs - if normally is without a closed fuel tap...
But as I had not only installed a fuel tap right on the fire wall prior to my last flight but also closed it I had no problems starting the engine.
Or put differently even when closed the Bing carburettors leak fule and slowly flood the engine and the oil remains in the cylinder head if there is a gravity feed from the fuel tanks.
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