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Thanks, hadn't planned on blocking the vent just trying to understand the concepts surrounding the design etc but have been reading all the threads and even pulled my oil system apart to check on a few of your pointers in regards too swarf in the non return valves.

All this was kicked off when for no apparent reason mine blew a dinner plate sized pool onto the floor randomly via the airbox/collector bottle.

My hypothesis is that the factory non return valves stuck open randomly and flooded the sump, on starting bike that blew excess up and overcame the capabilities of the air/oil trap and eventuated in the mess on the floor.

All my non-return valves were clear and indeed the reservoir did not drain via the oil cooler just dripped a bit initially so proved the valve worked.

I'm actually of the opinion that if the vent had been as JWilsons is now and the engines were originally designed with the vent via the rocker cover, that oil would have just dropped into the engine as impossible for that glut of oil to traverse the space and out the vent on opposing side.

I have reed valves, oil separators and pipe..... I will await Mr Richard-7's knowledge transfer before doing anything further though.