does it puke every time? Or just if it sits a couple days or longer? If only when it sits, you may need a new checkball & spring in the oil pump. The
ball's job is to hold the oil in the tank against gravity flow. The pressure
when it's running pushes it up. It may have corrosion or flat spots. If the
ball is bad, the seat it fits into may be bad also. There are ways to repair
that on this and other forums. One member has even built a tool to make this repair professionally.
If it sprays oil the whole time it is running, your chain oiler may be open.
Or if your engine is made from parts of different vintages (as my new Pan
is) there may be a passage from the oil pump into the cam chest that is
putting so much oil into the lower end your scavenge side can not keep up. Have you removed the return line & started the engine to see how the
return flow is? On a stock '80 you can remove the large cap under the seat, and see the flow. Caution, you may get oil everywhere! Pull the filter
out to perform this. Put the bike on a stand or table to sit level. Pull the cap then start it and watch. Probably get a new gasket for the cap if it's been a while since the cap was off.
Good Luck, I'm still chasing mine, too. d.rinner-okc
old harley parts are MY 401K!