Glass Insulator Spark Plug - Colortune, The Gunson Colortun…
![Glass Insulator Spark Plug - Colortune, The Gunson Colortun…](https://live.staticflickr.com/4001/4392205184_82a001997d_b.jpg)
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.
![](https://classiccarpartsaustralia.com.au/image/catalog/products_2021/MSA1002__2_.jpg)
Gunson's Colortune carburettor tuning kit. (14mm Spark plug) MSA1002
![](https://i.ytimg.com/vi/hBdB0GX1nM0/sddefault.jpg)
See Through Spark Plug!
Gunson Colortune Spark Plug Kit
![](https://www.gunson.co.uk/images/Technical_Articles/Colortune8.jpg)
Gunson Tech Torque Colortune See inside the combustion chamber
![](https://m.media-amazon.com/images/I/41My+8cy8oL._AC_.jpg)
Gunson G4171 Motorcycle Colortune Kit 12mm : Automotive
![](https://www.gunson.co.uk/items/medium/77121_Insitu.jpg)
Gunson Tech Torque Colortune See inside the combustion chamber
![](https://m.media-amazon.com/images/I/61iwgMM8TwL.jpg)
Colortune Engine Carburettor Mixture Tuning Gunson See Inside The Engine LSR41, Spark Plugs - Canada
![](https://www.howacarworks.com/illustration/1898/the-colortune-kit.png)
Tuning the engine with a colortune plug
![](https://www.gunsonshop.com/contents/media/g4055e_gunson_colortune_adaptor_kit_18_mm_gunsonshop_004.jpg)
18 MM Adaptor Kit for Gunson Colortune G4055E
![](https://www.gunson.co.uk/images/Technical_Articles/Colortune9.jpg)
Gunson Tech Torque Colortune See inside the combustion chamber
![](https://i.ebayimg.com/images/g/O~sAAOSw9YdcsHmJ/s-l400.jpg)
Gunson Colortune 14mm Plug Most Common Best Spark Plug Mixture Tester Tool kit 689789506875