What is the Colortune?
The Colortune has a clear spark plug that lets
into the combustion chamber while the engine is firing. The colour of
combustion flame tells you if the mixture is correct. With the
carburettor mixture screw you can then adjust the flame colour to get
the correct mixture.
The Colortune has colour charts and comprehensive
instructions to carry out the job effectively. An effective flame
colour - diagnosis section is included in the booklet. Comes complete
with periscope for recessed plugs.
Take the guesswork out of engine tuning with the
The world famous glass topped spark plug that
gives you a window into the combustion chamber so you can see the
Why is this important? The flame's colour tells
you the richness of the air/fuel ratio. A yellow flame means a rich
mixture and a blueish white flame a weaker mixture. Usually a bunsen
blue flame is spot on.
The Colortune is so simple that anyone can use
works on the principle that certain fuel mixtures burn with a certain
The Colortune will work on both motorcycles and
cars with carburettors. Just adjust the mixture screw to get the
correct flame colour.
Also works on injection systems that have a
Mainly older injection systems.
The Colortune comes in 3 spark plug thread sizes.
10mm, 12mm and 14mm. (Most cars are 14mm)
What size are your spark plugs?
Check the size on the Champion spark plug website here. Click on the vehicle type and select "Power Sport" then "Motorcycles etc.For NGK the first letter on the spark
plug number indicates the size.
Check the NGK code number for:
marine engines here
Here is a reference website that
shows the coding for different manufacturers plugs here
When ordering state whether you want the 10mm,
one motorcycle and need different plugs? Use the Colortune
kit. This best value kit is the standard 10mm Colortune with spare 12mm
14mm plugs. This is a complete 10mm kit with loose 12mm and 14mm
plugs. It will cover virtually the entire motorcycle range and
let you do most any motorcycle.
Motorcycle kit with two extra plugs, Colortune "A" kit: £63
(Extra plugs normally £18 each. Separate price would be £71