When I drained the oil from the tank and crankcase of the XBR I was surprised to find quite a lot came out of the crankcase. I was expecting only 100cc or so but it was way more than half a litre - about the same as came out of the oil tank. If it had been my Norton I would have put this down to wet sumping. Does the Honda engine suffer from this? I must admit I haven't studied the oil circulation carefully.