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@Jung
Hesitation off idle sounds like a lean condition. If it starts well, and responds eventually to full throttle, I'd say you've got dirty needle jets. I've found these are the most consistently difficult to clean with all the shite that builds up from modern fuels. Usually easier to bung in a new one. You can try raising the needle too if you still have the issue once they're clean. Lower the circlip one notch to start - richens the mixture on part throttle.