Not to sure you have a fuel related problem since you do only have one carb.
I would throw in a new set of plugs. Also take your plug caps off the wire, cut about 1/4" off and put the cap back on. I have this problem sometimes with my CA. I always carry an extra set of plugs.
Could be an overall rich fuel condition or maybe a weak ignition.
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1965 Honda CP77 — Ulsan Metro City, Rep. Korea
Restored with original parts — Owner: J. Doe
