It may have been just functional enough the way it was to run acceptably. Once time had accumulated the existing parts likely degraded to a point they could no longer provide the additional capacity needed to overcome the deficient condition. New parts always work better than old parts and if there is enough additional capacity new parts can often overcome a deficiency that would otherwise be evident.

This situation reinforces points I've made in other threads noting that we do not know what we are getting when we buy a new carb or engine with a new carb and to trust in a factory to assemble an item to be ready for flight to be ludricous. Never, ever, trust the needle position on a new carb, and hope they put all the parts in the right places inside the carb. Be prepared to correct deficiencies that arrive with new coarbs. They are never, ever assembled by the most competant or intelligent people.

DadsToys,

Thanks for the opportunity to take advange of this situation to make mention of it again.