by bgsengine » Wed Oct 23, 2019 5:40 pm
exhaust valve leak can cause a lean misfire or bit of surge, lack of power, I wouldnt worry too much about the rings for now, what you describe is pretty normal during leakdown test, rings are not a perfect seal as you know there *are* end gaps to the rings, so there'll always be a bit of air out the crankcase. just make sure your exhaust valve is actually closed (and not on the start of exhaust stroke, or in some cases on compression release) before condemning it.
How poor are they who have not patience. What wound did ever heal, but by degrees? - Iago (Othello Act II, Scene 3)