Read the original post! It does not say he ran it at WOT for three minutes.
I would never trust an engine to fly a plane that had not been run on the ground. I like to know that both needles are close before flying. I can't imagine anyone holding a 100 cc engine at WOT on the ground for 3 minutes.
I also think Keith should have had him send it in (at Keith's expense) because of the problems.

Bob