I know there's a similar question over in the motorcycle forum but maybe it's different for mowers, anyway I did the first valve adjustment on this blower (very long overdue), and I got to wondering if I should expect to see them tighten or loosen down the road. FWIW the intake was good, the exhaust was way loose. The mfr spec is .003"-.006", I didn't want to set it at either extreme so there would be room to roam with wear so that's where I got the question, I don't know which direction it will go. I set it at .004". As a comparison I know on my dirt bike they always tighten but that's due to the seats wearing and also that's a shim system with an overhead cam.
Anyway, runs awesome, and took almost no time.
Anyway, runs awesome, and took almost no time.