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Colortune for 14mm Spark Plug

4.1 out of 5 stars 14 customer reviews
| 7 answered questions

Price: $69.89 + $10.95 shipping
Only 19 left in stock.
Ships from and sold by Automotive Specialty Tools, LLC.
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  • Adjust the idle mixture and determine the overall condition of your carb during actual use
  • Simply screw the Colortune Engine Analyzer into one of the spark plug holes and you can see the color of the flame produced during combustion
  • Includes detailed, full-color instructions, special viewer, cleaning brush and extension
  • For use on Motorcycles and High Performance engines with 14mm thread spark plugs
$69.89 + $10.95 shipping Only 19 left in stock. Ships from and sold by Automotive Specialty Tools, LLC.

Frequently Bought Together

  • Colortune for 14mm Spark Plug
  • +
  • Edelbrock 4025 Uni-Syn Carburetor Balancing Instrument
Total price: $99.88
Buy the selected items together


Product Information

Technical Details

Brand Automotive Specialty Tools
Item model number 19-4074-100
Manufacturer Part Number 19-4074-100

Additional Information

ASIN B000E9VGNM
Customer Reviews
4.1 out of 5 stars 14 customer reviews

4.1 out of 5 stars
Best Sellers Rank #17,414 in Automotive (See top 100)
#2 in Automotive > Tools & Equipment > Diagnostic & Test Tools > Ignition Testers
Shipping Information View shipping rates and policies
Date First Available September 24, 2012

Warranty & Support

Product Warranty: For warranty information about this product, please click here

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Product Description

Adjust carburetors or injectors with a translucent spark plug while the engine is running. The Colortune allows you to watch the flame in the combustion chamber as adjustments are made.

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

I used the 10mm Gunson Colortune to tune my 1992 Yamaha Seca II (XJ600). The bike is ridiculously lean from the factory, taking about 10 minutes to warm up on cool days (it would literally starve and die when given throttle if you didn't wait this long to warm it up).

I bought a dynojet Stage 1 Jet Kit, which added fuel to the mid and upper range and improved performance dramatically. But the idle was still awful, and it still took forever to warm up enough to actually ride.

I tried messing with the idle adjust screws on the carbs but couldn't really tell what was going on. I turned all of the pilot screws a turn out, to richen it a bit, but it didn't really seem to help. I also synced the carbs, which helped the bike, but didn't help the 'cold blooded' nature of it.

Enter the Colortune. I did my tuning at night in the dark, it was easy to see the combustion process at night in my driveway, even with the lights on in my garage. I would not attempt to do it in sunlight, you won't see anything.

I started with cylinder 1, after the bike fully warmed up, and saw blue combustion; as I expected (it's lean). I turned the pilot screw out with the bike running; and was shocked that it stayed blue after 3 full turns! Finally, at around 4 turns, everything turned orange and the bike started to bog a bit. You should note that the color in the glass tends to be leaner than the color in the cylinder; on these old engines, fuel doesn't distribute as evenly as a new fuel injected bike. So try to look down in and see the color at the spark itself. Look past the occasional lean, blue flash up in the plug itself, and you can see exactly what's going on in the cylinder.
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I really like this product! If I can take the guess work out of any task then I am all for it. When it comes to working on old cars, it just makes sense to find the best mixture as soon as possible so you can move on. The colortune makes it very easy to find that sweet blue flame an engine needs to purr. Be patient and take the time to make some micro adjustments until you are satisfied the firing color is to your liking. Make sure you check the timing too. Once you are dialed in, hit the road and enjoy.
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Excellent Product. Tuning carburetors by ear is an art, but it is still not as accurate as the visual feedback provided by this tool. Simply replace one spark plug with this tool (hand tighten only), then start the motor and observe the color firing inside the cylinder. Orange = too rich, Light-Blue/White = too lean, Bunsen Blue (deep blue) = just right. Doesn't get any better or easier than that. Saved my hundreds of hours on my race engine. Thank you ColorTune...
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Had difficulty being able to see a difference in color when adjusting the carburetor jet from lean to rich.
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Works like a charm. Much easier to tune than listening by ear for revs.
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This is another nice tool to have on hand. It takes a learning curve to use, but and the instructions really help in this area. I say this because if you have not used something like this before. like me, then it may take several attemps using it to get the hang of it. It does give insight into the cylinder fuel mixture and burning. This is a nice add on to my tool collection. As my auto has multible carbs on it.
Nice tool.
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i like being able to see into the combustion chamber made initial set up much easier although im still gettin used to tuning via this method
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