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Colortune contents

What is the Colortune?

The Colortune has a clear spark plug that lets you look into the combustion chamber while the engine is firing. The colour of the 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 Colortune.

The world famous glass topped spark plug that gives you a window into the combustion chamber so you can see the flame.

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 it. It works on the principle that certain fuel mixtures burn with a certain color.

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 mixture adjuster. 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? For NGK the first letter on the spark plug number indicates the size.

C 10mm
D 12mm
B 14mm

Check the NGK code number for:

motorcycles here

marine engines here

snowmobiles here

When ordering state whether you want the 10mm, 12mm or 14mm kit.

Only £37


Check what that is in your currency.


Professional Colortune Kit in hard carry case

The Professional Motorcycle Colortune has up to four clear spark plugs that lets you look into all combustion chambers at the same time while the engine is firing.

With the carburettor mixture screws you can then adjust the flame colours to get the correct mixtures on all cylinders at the same time. You can do one at a time with the standard motorcycle Colortune but it's simpler with the professional model.

Also available is the multiple Colortune kit that comes complete with one 10mm, one 12mm and one 14mm plug so you can tune just about any bike in the garage.

Supplied with viewerscopes for bright light conditions, and viewing in recessed engines.

Available in 10, 12 & 14mm, in kits of 1 - 4 plugs.
Large Hard Carry Case - will hold up to 4 plugs
Can also be used on cars

The basic price for the Professional Motorcycle Colortune is £70.

Two 10mm (or 12mm or 14mm) plugs kit £70

Three 10mm (or 12mm or 14mm) plugs kit £92

Four 10mm (or 12mm or 14mm) plugs kit £110

Special mix kit contains one 10mm plug, one 12mm plug and one 14mm plug. This will cover virtually the entire motorcycle range and let you do most any motorcycle. £92 Or you can have any mix of plugs. Special offers when combined with the Carbtune. See Combinations in the shopping cart.

Post and packing UK £2
£3 Airmail Europe, £5 airmail USA, Canada, Japan, Australia, N Zealand. Rest of World £12



Morgan Carbtune Ltd
Unit 33W
Townsend Enterprise Park

Townsend Street

Belfast BT13 2ES

United Kingdom


Téléphone +44 2890 239007
Fax +44 2890 247294

D' USA/Canada Direct dial
Tel 011 44  2890 239007
Fax 011 44  2890 247294