I've adjusted timing, mixture screws, checked compression, fuel flow, and spark and running out of options here. The best I've had so far was about 3800 rpm. It won't plane at all. I have a service manual to refer to but still can't pinpoint the culprit. Also it has some minor carbon build up but nothing that I would think could cause it to run like it does. Either way I'm in the process of burning it out. Can someone help please it's driving me crazy.
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