ORIGINAL: Oldbob
Artisan & Turk, thanks for the input. I took the carb apart and found that the venturi hole in the barrel had a sharp edge sticking outward and cut a deep grove into the carb housing. I used a small file and removed the sharp edges. Now the barrel turns easy but I wonder if I am sucking air into the engine that is not going through the venturi?? The engine runs at 12,500 peak and steady at about 12,000+ with an APC 11X6. Does this sound about right?
oldbob
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The peak rpm sounds about right. This is a new engine that will probably gain close to another 500 rpm over time, putting it right where the winners in this class are running at. I think you are home free with this one.
Oil from the fuel will fill in around the carb barrel fit and will plug it up sufficiently. Besides, all you really should care about is how the engine is running and leave the fitting worries to the manufacturer. Your engine sounds as though it is running perfectly from your description.