Gunson Colortune Single Plug Kit 14mm

Save pound’s by having the correct fuel mixture. Tests proved that Colortune can save petrol by enabling you to correctly adjust the fuel mixture at the Carburettor. It actually provides a window into the combustion chamber as the engine runs, so you can adjust the colour of the combustion flame. Pays for itself in petrol savings. Its unique design maintains compression while the engine runs and ensures correct firing of the mixture.

Gunson G4074 Colortune Single Plug Kit (14mm thread) fits most standard petrol engines. Colortune adaptors are also available.

See the How do I adjust the carb on my vehicle ? article in the Technical Articles section