I’ve never noticed if one, or both, of the poppet valves lift when rocking the flywheel. When cleaning, compare the height of the 2 springs. If one is longer than the other, the poppet valve with the least resistance will be the one that lifts. Unless you find something I don’t think you have a problem. Try switching springs and see what happens.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.
