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What did you actually do when you 'cleaned out the carb'?
Did you buy a new gasket /overhaul kit, then remove & strip the carb? Did you clean it in the prescribed manner then reassemble it all & check all the various settings as per the book?
Have you replaced the fuel filter? For the price, it's often a good idea to replace it at the first sign of a fuel related problem.

If everything else is on the money [points, timing, plugs & tappets] then giving the carb a minor overhaul will usually fix everything.