The carburettors are designed to be run with an airbox there are pipes that force air into the carbs while its running to lift the diapragms up and if there are any leaking vaccum pipes from the inlet side of the carbs it will suck in air and run weak .best thing to do is put the airbox back on it.
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The carburettors are designed to be run with an airbox there are pipes that force air into the carbs while its running to lift the diapragms up and if there are any leaking vaccum pipes from the inlet side of the carbs it will suck in air and run weak .best thing to do is put the airbox back on it.