Valve lash adjustment

Use the starter and "EOIC"

This means

Turn the engine until the EXHAUST just starts to OPEN and adjust that intake

Turn the engine until the INTAKE has fully opened and is nearly CLOSED and adjust that exhaust

This, by the way, works on anything with poppet valves from a Briggs single whanger to a V, a W, a Boxer, or an inline whatever

I can't speak for U engines



or big radials, but at my age I'm unlikely to need to know