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How to use a Colortune plug

How to use a Colortune plug Mixture adjusting screw Carburettor Colortune spark plug HT adapter HT lead Cylinder head

The Colortune spark plug is screwed into the engine in place of the normal plug. By viewing the colour of the burning fuel/air mixture, you can tell whether the mixture is too rich, too lean or correct.

You can then adjust the mixture by tuning the mixture adjusting screw on the carburettor until the flame is the correct dark blue colour.