I just wanted to set the record straight on the enfield oiling system.
There are too many urban legends out there.
It's been virtually the same on all the singles and twins (except the series II intercepters), since the 40's.
There are 2 oil pumps each driven by the same shaft. The oil is drawn from the tank, thru 1 pump, into the filter then directly into the crank and big end. The oil is then scavenged fron the crankcase thru the 2nd pump which is larger capacity than the feed pump, and up to the rockers, then drains down the pushrod tunnels to the timing case and back into the tank.
The english singles also had a pressure relief in the line to the rockers which fed directly back into the tank.
There is no way you could change the flow to the big end other than by the speed of the engine! (you could use larger oil pumps)