Is the Gunson Colortune still a good device? : MG Midget Forum : The MG Experience

I have used a Gunson Colortune glass spark plug to set the mixture on my Midget for years. With this device you can see the combustion flame. You tune it until you get a Bunsen Blue flame. I also read my plugs to confirm the settings. I h

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Gunson Colortune - My Thoughts : MGB & GT Forum : The MG Experience

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