How to Tune SU Carburettors (part 2) - Gunson ColorTune

Adjusting an SU carburettor

Restoration Volvo 122S 1969: Volvo 122S B20B engine - More tuning

Australian RR Forums: Understanding the HIF7 Carb

Colortune plug insert changes the air-fuel mixture combustion color while the engine is running. Ref: MSA1002, COLORTUNE, GUNG4074, GUNSON02.

Colortune, Carb Tune-Up Tool (STL0037)

How to Set Up and Tune SU Carbs in Easy Steps

Fuel Mixture Tuning Tools - Pre-XK - Jag-lovers Forums

Colortune spark plug user manual

Proper use of the Gunson Colortune

Twin HD6 Carbs adjustment - Jaguar Forums - Jaguar Enthusiasts Forum

SW-EM Carburetor Additional Notes