I know you said you cleared the carbs, and triple checked your work but I'm going to say I think it's going to be an carburetor issue. I have cleaned mine well, and still had managed to have trash in the carb. I am a master mechanic for two different manufacturers, albeit 95% diesel fuel only.
What I'm saying, is it only take that one circuit robbery clogged, even partially, and give your kind of complaint.
Is it due for a valve clearance check?
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