Deptydog,
what is valve lash. Never heard that term before.

I did check the valves before I installed the motor. They were perfect. I checked all my screws before I installed it, and they were tight.

Like I said. I have about 1/2 gallon thru it. Do I need to flight it some more, and just keep breaking in my engine. And start worry about it after about another 1/2 gallon are so.

I was thinking about freshness of fuel. this just is about 3 months old. I have about 1 tank or so left in the jug. I am picking me up some fresh fuel this week for the weekend. So maybe this might help. by the way I am running byron 20/20