G4074 Colortune for 14mm Spark Plug The Tune-up plug for two & four stroke engines with single, twin or multiple carburetors or fuel injection systems. The best tool for seeing what’s happening inside the combustion chamber of the gas engine. It allows you to see the combustion and to adjust the mixture by color. Fits most gas engines in standard form. Additional adapters available for vehicles with alternative sized spark plugs.
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