....periodically flood the crankcase with oil through the
breather nipple....and remove the valve cover and oil the
rockers as well. Thin some oil a little bit, and run it down
the pushrod tubes, and flood the cambox as well.

After you run the 4-strokes for awhile, you will find out that
they really don't lube from the "blow-by" worth a hoot. In fact
no oil gets to the cambox and rockers at all. They rely on the
hardness of the metal surfaces to make them last.

Dave.