He stated that the oil relief was missing and installed a new one.
My bad ... looks like I missed that somehow ....
....
I guess the next place to look is at the end of the crank where the brass fitting is (Flywheel has to come off) , if that was smashed during installation , it will not seal and you will not have oil pressure to the top end , if that is damaged , as far as I know , the only "fix" is to replace the crank ... There is also a Oil Seal in the ignition cover where that brass fitting goes