Hayter R53S starter problem

Hi, My Hayter R53S recycling mower suddenly won't start properly. The engine starts on a pull from the cord but it just turns over slowly and laboriously and when I try to move forward it cuts out. I've checked the fuel line is not blocked and the air filter is fine. The oil seems ok. Can there be a blockage inside the carb? If so do I take the carb off (to do this do I just undo the two nuts and pull it off?) and clean it by swishing it around in petrol. Is there anything else that comes to mind? Any other suggestions would be most welcome.
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