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.

Project Snicket, Colortune – Tastes Like Petrol

Gunson Colortune 10mm Fuel Air Mixture Tester Kit G4172

Gunson G4171 Motorcycle Colortune Kit 12mm

Gunsons Colortune – MGB tips mods and maintenance

Colortune spark plug — Moped Army

Any old timer carb tuning guys here? Any thoughts on gunson

Gunson's Colortune carburettor tuning kit. (14mm Spark plug) MSA1002

Color-Tune 2 Kit January 1969 - Motor Sport Magazine

Gunson Colortune See Through Spark Plug Kit

Colortune for 14mm Spark Plug G4074 U

COLORTUNE, GUNSONS, 14mm

Gunson Colortune 14mm Spark Plug Tune up Tool for sale online

Project Snicket, Colortune – Tastes Like Petrol

Adjusting 928 mixture using Colortune, anyone? - Rennlist

Tuning the engine with a colortune plug