Precise carburetor adjustment is as easy as changing spark plugs with the Gunson Colortune. Different air-fuel mixtures burn different colors, and the Colortune plug insert allows you to see the combustion color while the engine is running. Carburetor adjustment is then made to achieve the correct combustion color. Maximum power and fuel efficiency are obtained. The Colortune kit comes with an ignition cable extension, plug cleaning brush and optical extension tube. Full instructions for operation are included.
Very helpful in setting up twin carb applications.