Thought this article might be interesting for some.
There are quite a few reasons why a bike will wet sump.
http://bunnbreather.bigblog.com.au/post.do?id=219490
A very good move Musky.
Rex, who designed the "improved" breather because he was too lazy to pull the barrel of his B40 and do the traditional fix to stop oil running up the stud and leaking from under the head nut washer, has now become a world authority on crank case breathing.
Seems that no one in the past actually did much in the way of research into crankcase breathing each designer just followed the theories of the previous generations ( make a vaccuum in there and it won't leak ). The idea of pulling fresh air into the cases then expelling the old air had just not been done.
Auckland uni ( I think ) has just made a research grant available so they should be some substantial improvements in the next few years.
Most of the ones fitted to members bikes have gone onto singles but a BSA twin is in effect a 2 cylinder single due to the 360 deg crank.
Apparently the historic racers have taken to them big time and get significantly more power & better acceleration from the breathing system.
Talk about giant elms from little acorns.
Best still is that he now has access to better materials consultants that myself so he should be able to find or have made better valves. At present he still cuts them by hand from scrap rather than buying them in prepunched from virgin material which effectivly halves the price. The stuff ( which I will not reveal) is more expensive than carbon fiber impregnated kevlar.