Gunson G4074 Colortune Single Plug Kit For Vehicles with 14mm Spark Plug

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£31.25 (inc. VAT)

Out of stock

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Item Description


Quality Tools from


Colortune Single Plug Kit

Size 14mm

The Tune-up plug for Petrol/LPG 2 & 4 stroke engines with single, twin or multiple carburettors or fuel injection systems. The original and best tool for seeing what’s happening inside the combustion chamber of the petrol engine. It allows you to see the combustion and to adjust the mixture by colour. Fits most petrol engines in standard form with additional adaptors available for vehicles with alternative sized spark plugs 

18mm- G4055E 

14mm – Long Reach G4055D 

14mm – Tapered Seat G4055C 

12mm – G4055B 

10mm – G4055A 


  • Kit includes: 14mm Short reach plug
  • Hexagonal adaptor
  • Colortune will fit most vehicles
  • Kit complete with instructions
  • Extra adaptor sizes available separately