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You do not need to replace the rings, but they do need to come around after sitting.  With all of the various oils used to free up the engine, those oils are also sitting the exhaust system now.  Plus, there is also a chance that you have excess gasoline running past the carbs into the engine.  All of these show up as the engine warms up.  Best thing to do is run it to temperature and just let the oil burn off.  You will know if it is gas leaking because you will have white smoke just after start-up.