Colortune for 14mm Spark Plug 19-4074-100

Now you can 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. Adapters available for 10mm, 12mm, 14mm long reach and 18mm thread plugs.For High Performance Motorcycles Engines use Colortune 19-4171-100 (12mm) or 19-4172-100 (10mm)