CB450K5 question, if anyone can assist. 15K mile engine that sat for 20 years before I acquired, I’ve put another 3k-ish on it since. Last week it started putting some oil out of the valve breather hose (enough to cause worry)and subsequently starting running poorly on one of the pots. Compression is good on both sides (~180psi at full rev), with little variance between the two, so the rings don’t seem to be the culprit. I’ve narrowed it to the valve oil seals, which I plan on getting into directly. Has anyone had this issue, and can these be replaced without pulling the cams? Any tips or tricks? Not had much luck with youtube, Haynes manual, etc. Thanks in advance!