12mm spark plug Motorcycle Colortune 33-4171-100

Colortune for Motorcycles and Other High Performance Engines - Adjust carburetors or injectors with a translucent spark plug while the engine is running. Designed to take the higher heat and pressure of a performance engine, this Colortune allows you to watch the flame in the combustion chamber as adjustments are made. Fits most 12mm plug thread engines. Made in England.

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