Glass Insulator Spark Plug - Colortune, The Gunson Colortun…

The Gunson Colortune spark plug, another fine piece of work from our friends across the pond, the Brits. This plug is designed with a glass insulator to allow viewing of the combustion chamber in autos, cycles and other small engines. The purpose is to identify the color of the combustion and therefore determine the fuel/oxygen mixture strength and adjust as needed. Too rich, yellow/orange flame; too lean, light blue/white flame. Bunsen blue flame is just right.

Gunson Tech Torque Colortune See inside the combustion chamber

Tuning the engine with a colortune plug

Gunson Colortune 14mm Plug Most Common Best Spark Plug Mixture Tester Tool kit 689789506875

Colortune Hi-Gauge Spark Plug Adaptor Kit 10mm - Gunson Part Number G4055A TOOL

Gunson Colortune 14mm Plug Most Common Best Spark Plug Mixture Tester Tool kit 689789506875

Gunson Testing Tools

Gunson G4171 Motorcycle Colortune Kit 12mm : Automotive

Gunson Colortune Issue Patrol 4x4 - Nissan Patrol Forum

SU Midel For All Your SU Carburetter Requirements - Colortune Single Plug Kit

GUNSON COLORTUNE KIT MOTORCYCLE 10 MM (G4172) - Matthys

Easy engine tuning - Colortune by Gunson

Gunson G4171 Motorcycle Colortune Kit 12mm : Automotive