Tuning the engine with a colortune plug

Although some experienced mechanics can tune a car's carburettor fairly well by ear, to do the job really accurately you need the help of special equipment.
Although some experienced mechanics can tune a car's carburettor fairly well by ear, to do the job really accurately you need the help of special equipment.

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Tuning the engine with a colortune plug

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Tuning the engine with a colortune plug