Seller notes

This listing is for ONE (1) NEW, Motorcycle Carburetor Vacuum Synchronizer Tool for use on twin cylinder British motorcycles. We say British twins because most have a vacuum port on each intake manifold, otherwise known as the balance tube. We first came across these vacuum gauges when tuning the four-cylinder Japanese motorcycles of the 1970's. Attach the hose from each gauge to the port on each carb, adjust your air and idle screws to within spec until all gauges read the same. Bada bada bing!...

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