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G4171 Colortune for 12mm Spark Plug Specially designed for motorcycle engines this low volume colortune maintains the compression ratio of the engine, ensuring better firing of the mixture. Suitable for 12mm spark plug.
Gunson G4171 Motorcycle Colortune Kit 12mm
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Gunson's Colortune carburettor tuning kit. (14mm Spark plug) MSA1002
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Tune Your Engine Using a Colortune Spark Plug - Gadget's Fixit Page
Gunson Tech Torque Colortune See inside the combustion chamber
The Tune-up plug for Petrol/LPG 2 & 4 stroke engines with single, twin or multiple carburettors or fuel injection systems. The original and best tool
Gunson Colortune 14mm Plug Most Common Best Spark Plug Mixture Tester Tool kit
How to Tune SU Carburettors (part 2) - Gunson ColorTune