Good position about the "Made in America".

I'm concerned that if this engine has a broken lug, and that there may be some distortion in the crankcase. This can case extra drag and often results in sealing problems with the crankshaft and crankcase. Now I fear that the most likely damage is that if this engine was crashed ( broken lug) that the low speed needle might has been jammed into the low speed metering orifice (found in the spray bar) If this has happened the damaged low speed fuel orifice will not allow for proper mid range operation.

I'm concerned about the 1/2 turn low speed needle setting. I suspect that this is still too tight and might be your fuel restriction at full throttle. Is this 1/2 turn set with the carb just barely closed?

Can you define "full RPM"? I don't think a 10 x 6 will spin 14K on this engine. Do you get a high speed needle response from rich to lean?

The fuel is not an issue for getting the engine to start. It is more an issue with longevity.

All the best,