When your vintage Honda motorcycle is properly tuned and the carbs are perfectly vacuum synced you will find that it fires up cold in an instant, has a smooth steady idle, and smooth acceleration at riding speeds. When it is out of sync you can often find your idle peaky, hanging, overly sensitive, and the perfect recipe for a rough ride. With a 4-cylinder motorcycle like the Honda CB350F, CB400F, CB500K, CB550, CB750, or many more vintage 4 cylinder motorcycles you need to take the extra steps past getting the engine to fire and run, and tune it to a place where it is going to keep you safe and perform properly. In this 2 part series, we go over the why, when, and how of vacuum synchronization as well as dive into some of the differences between the different models of motorcycles we support. Learn how to set up your Common Motor 4-cylinder vacuum sync kit and tune your new cafe racer or scrambler right at home in your garage.

4-Cylinder Vacuum Sync Kit: https://www.common-motor.com/honda-55...


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