Proper synchronization of dual carburetor set-ups is essential for peak performance. Accurately dial in your carbs. with one of these Carburetor Synchronizers. P/N: 43-5712 includes two Adapters which allows for 1-tool usage on a wide spectrum of applications. The Pro-Synchronizer will not restrict airflow and feature an easy to read 1-30 kg/h numbered scale for precise synchronization.