This engine came out of my 1983 XS650SK. It came out of the frame for an oil change. I broke a pan bolt and had it repaired by a machinist. While the bottom case was off, I replaced the transmission because I broke a dog off more years ago than I can remember.
OK, this engine runs fine. It pulls just fine. It smokes. It has 57,372 miles on it.
So, first thing I did was put an engine in the frame that I bought in 2003, condition unknown. It runs fine, but the fwd cam chain tensioner foot has lost the plastic bit and must be replaced. So, I have to pull it and take it apart to fix that. I operated it for 1.4 miles and it ran fine.
I just discovered the thread on replacing valve seals without tear down.
So, what would you do? Replace the foot and go, or replace valve seals and go? I would prefer to put off restoration of this motorcycle and just keep riding it. I have others I wish to resurrect first.