Colortune 500 Lean/Rich Tool

Colortune is a glass topped spark plug which allows you to see the color of combustion in your cylinders. Colortune takes the guesswork out of mixture

fixing the damn idle on my T120's mikunis

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

Triumph TR7, TR8 Tools

Sold] Vintage Gunson's Colortune 500 : Buy, Sell & Trade Forum : The MG Experience

Colortune Inst

MG Midget, Austin Healey Sprite Car care, garage supplies and tools

Gunson Tech Torque Colortune See inside the combustion chamber

Determining Rich or Lean Condition

Triumph TR7, TR8 Carburetors

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

Gunson Tech Torque Colortune See inside the combustion chamber

Reading Spark Plug Info, Quote From John Healy - Britbike forum

Colortune spark plug user manual

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

Jaguar XK120, XK140, XK150 Restoration & Maintenance Tools