Don't forget to check your clutch side cover gasket to make sure sealant is not restircting the tiny oil passage.
Second.... when I rebuilt mine, the owner of the salvage yard where I got the used good head said to loosen the oil passage head cover bolt and make sure you get oil out.
When I tested mine, I took the sparkplug out so no load on engine, and crank crank crank .... nothing. Then took the bolt all the way out, looked down to see if I could see any oil.... crank crank crank
splat ...... oil all over the face... shot up a good foot or so.