there is no sump bolt as the bike does not have a sump,its a two stroke engine and has just a small amount of 2 stroke oil injected into it via a small pipe from the oil pump,there is a small gearbox assembly at the very rear of the engine that holds about 100ml of ep90 gear oil there is a drain and filler bolt there but you have to take the transmission cover off to see it if memory serves me well.
adam bike doctor(of milton keynes motorcycle centre), June 2011
