Hello fellas,
Let me start off by saying that I am unclear on the fundamentals of oil delivery on our bikes. Although I have read some threads elsewhere on wet-sumping and various modifications such as check valves etc. that can be installed, I still do not understand the basics of how the BSA pre-unit oil system works.
My A10 has oil that "appears" on the top fin. Since I bought it I have not ridden it much because there are a couple items that need to be ironed out before she's road worthy, so after it sits for a day or so, this oil appears. The couple of times that I have rode it, I noticed some oil leakage around the rocker box covers, etc. but after cleaning all that up oil still accumulates on the edge of the top few fins.
Following advice elsewhere on this thread, I removed the oil tank for the first oil change in order to flush it. It does have some sludge in the bottom, although it's not too bad. But further adding to my confusion is the "crimped" oil line inside the tank. Is this by design? if it is, what is the purpose of the hose attached to it (that goes to the crankcase which I assumed to be a return)? Any information would be much appreciated.