GUNSON.Colortune looks like a sparking plug with a transparent chamber in place of the ceramic insulator. It allows you to see the colour of the flame in the combustion chamber of a petrol engine and, where it is possible, to adjust the mixture simply by colour.
Full instructions, more on applications and fault-finding included.
See Instructions as a PDF file. Colortune has a standard 14mm thread and the kit includes a thick copper washer to cope with tapered seats. Fits most standard petrol engines including motorcycles, boats and garden machines, but some might need an adapter as follows:
G4055A Adapter 10mm, 2-stroke motorcycles.
G4055B Adapter 12mm, 2-stroke motorcycles.
G4055C Adapter 14mm, slim.
G4055D Adapter 14mm, Long Reach.
G4055E Adapter 18mm, Large Fords, American and some other imports, and some Classic cars.
There are also Colortunes available in 10mm and 12mm size, specifically for motorcycles - see GG4172 and GG4171.
12-month Gunson warrantyE&OE
