I like the idea of having the check valve in the oil pump . If it could be done like the one from Thiel (threaded in to the outlet side of the oil pump and larger diameter etc). This would be easier to service /replace and Norton can do this from the factory. I also am of the view that wet sumping should not have to be tolerated , or at the very least not cause you to have to drain and refill your oil. Let me put it into perspective : When my bike was delivered (Dec. 2014) it would wet sump the entire oil tank into the crankcase within 6 hours or less , probably closer to 4 hours ! Next morning my oil tank was DRY not a drop of oil in there , all in the bottom.