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@retrodicorsa
Also, turn the pedals with the back wheel off the ground and watch how the chain runs over the sprocket - if you see a 'lump' go round it every so often you squeezed the chain too tight when you re-joined it and there is a tight spot. Locate the tight link on the bottom run of the chain and then gently bend the chain sideways pressing with your thumbs either side of the tight link, this should open it up enough to make it smooth again.