I really don't think this is the valves. This is usually is a sign of the piston rings sticking. This can be caused by a few things... I think. I do remember the member @Madkawi750 having his rings sticking because he used canned ham oil mixed in with his regular Grizzly oil. But wiser people than me will chime in.motor smokes on start up till engine gets warm so if valves are out of adjustment would that be one thing that would cause that?
In most cases its valve seals. But piston rings could also cause it.I see. So for the sake of education could piston rings cause this as well? Or did I remember wrong.