Colortune 12mm

Auto Expert Products Inc.

Call 1.800.795.6958 or email John Abbott with your technical questions

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1998 Cobra

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Gastester

Tech Edge - Air Fuel Ratio Meters

Colortune12mm

$69.95

The Motorcycle Colortune has a higher range for engines with compression ratio greater than 10.5:1. Use Motorcycle Colortune if you use higher heat range plugs. Made from a metal with greater heat dissipation capabilities Buy Adapters

Colortune adapters are $14.95 each: 10mm, 12mm,14mm long, 18mm. Colortune adapters fit 14mm Moto Colortune and standard Colortune.

Here's how to determine if you need an adapter

Look up your vehicle in the NGK product guide

Motorcycles and ATVs
Cars, trucks and SUV
Marine engines
Snowmobiles

Use the first letter of the product code to determine the adapter. Remember colortune comes with 14mm threads.

A - 18mm
B - 14mm
C - 10mm
D - 12mm
J - 12mm

How to decode spark plug codes

Master Cross Reference Table If that fails look up your plug number in the cross reference chart. First find the plug manufacturer. Next click on the column header to select the entire column. Then do a FIND command using the spark plug number. Scroll right and check the column that indicates thread diameter.

Take the guesswork out of engine tuning with Gunson's 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 color tells you the richness of the air fuel mixture. A yellow flame means a rich mixture and a blueish white flame a weaker mixture. A Bunsen blue flame is spot on. Colortune is so damn simple that anyone can use it. Colortune is unaffected by ambient weather conditions because it works on the law of physics that gases burn with a certain color. Remember high school chemistry lab and the Bunsen burner. So stop reading plugs and start tuning by color.

How to choose between colortune and Gastester. Use colortune when you have multiple carbs and don't want to drill ports in exhaust manifolds and you have a clear line of sight to the top of a spark plug. In a multiple carb application you must be able to associate an exhaust stream with a carb so you can adjust the carb's fuel mixture by measuring the exhaust stream. If you just want to set the fuel mixture to it's correct strength without knowing what that strength is then use colortune. If you want to know the air/fuel ratio then use Gastester.

Colortune 12mm