Thanks, Tom - you hit the nail on the head - I opened the idle needle about 1/2 a turn which was too much and then backed off 1/4 - tweaked it a bit more and it sounds like a different engine - 90 minutes into the break-in - I feel a lot better - at 3/4 throttle, the engine started to pull the stand weighed down with a 40 pound bag of wood pellets across the floor - LOL.