Oiling issue

[Bandera rider]

I am new to the forum, but have owned my Hawk 250 for a little over a year. I bought it new in February of 2023. I have put 2000 miles on it with no issues. Recently while adjusting the valve lash I noticed the rocker was darker in color, as well as the push rod on the intake side. I cleaned it up put it back together and went on a short ride and somehow bent a valve and lost compression. Ordered a new head assembly and installed it, adjusted valves started it up and have gone on a few short rides. On the last start up noticed a louder tapping noise. Removed valve cover and seems like the same issue is reoccurring. It seems as if the valves are not getting properly lubricated. I have used a compressor to check the passageways in the valve cover to make sure they are clear . Not sure what else to check and fear if I continue to run it I will mess up another head assembly. Any suggestions would be appreciated.