dutch that's a lot of messing about making a vent when all you have to do is move the crank a tiny bit with resting a leg on the kickstart, and the rest of the oil drains out, I think it gets vacuumed because my old sump plate had BIG holes muchos damage in it and in the days of it being stood a few weeks and wet sumping if I thought there was more in there I just prodded the kicker a bit and it all came out