ok guys, my first time posting here. i apologize if this has been discussed over and over, but i couldn't find anything to answer my questions real easily. I am trying to rebuild an old Honda XL80s i had when i was younger for my son. We have had it running, but have since then, had to replace cam chain, both sprockets, one valve (thanks to cam chain slipping). Now, after having it all back together and running for several months, the valves started ticking. i readjusted the valves and it ran fine for a little while, now they started ticking again. when i went to readjust them again, i see what the problem is; there is little or no oil making it to the top end and the cam journals have worn. So i did a little research and found that a newer XR80 head will fit without any retrofit, as long as i have the appropriate head gasket for the year of head i am using. i also have a newer cam and cam holder. is there anything else i may need to make this swap? i also purchased a newer oil pump to hopefully correct the oil flow problem. i will thoroughly clean the block and screen when i have the cover off to change the oil pump. How can i verify i am getting oil to the top without running the valve train dry for long? Thanks for any help! it's great to see my boy learning to love to ride as i did when i was younger.