The Gunson Colortune kit – G4074

allows you to see into the combustion chamber of the engine and to adjust the mixture simply by the colour you see down. It fits most standard petrol engines

The Gunson Colortune is a unique mixture setting device and a detector of other mixture related problems. It is a sparking plug, which runs the engine like any normal sparking plug, but because it has a glass insulator, it allows the colour of the combustion flame inside the cylinder to show through it, thereby indicating the strength of the mixture or other faults.

Key Features

  • Will fit most vehicles
  • The Colortune allows you to set the mixture very accurately
  • Provides a unique view of the behaviour of the fuel burn

In the box

  • 14mm short reach plug
  • Instructions
  • 1 year warranty


  • Correctly setting the mixture will improve the ignition


  • All vehicles fitted with standard 14mm plugs, (some large Fords will have the 18mm spark plug which is available separately)
  • It will also fit motorcycles with 2 stroke engines, although others bikes may use the smaller 12mm plug, therefore please check before buying (available separately)

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