Thanks Tony, the bike hasn't been run yet since rebuild.It's on a lift/bench so it is upright and level.It's a learner bike but i'm 50 and have experience of rebuilding 2strokes (maico,husky,Sachs,RM,CR,YZ moto-x,Gasgas,Bultaco,Fantic,Beta trials plus GT,RD etc).Looking at the crankcase with the clutch cover off and measuring where the sightglass level would be it looks like the oil level should come to just above the selector mechanism but i just can't see an obvious place for the oil to get into the gearbox.........more tea and head scratching required!