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    • ***Download Release Form Here***
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Spark Plugs

Reading spark plugs…I know I am guilty of not doing this enough. Sometimes we are in such a hurry that we don't read the plugs...silly. Fact is if you take the few extra minutes to read your plugs you could prevent that expensive engine from death. Below are some links I have read over the years. Some of this does not apply to boats but should broaden your understanding. Fact of the matter is our two-strokes with small props with light load require different maps than large props with high load. Period. Read the plugs. This applies to both fuel and ignition. This general rule of thumb and a conservative approach to mapping can keep boating fun. I thank the companies who have published their hard work. Enjoy.

Dave Bush

How To Read Spark Plugs by Gordon Jennings
Reading Spark Plugs by Rising Sun Cycles
NGK Spark Plugs Overview

Back To Technical 101
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  • Winning
  • Products
    • Electronics
    • Johnson/Evinrude >
      • Sleeves >
        • DBR Johnson/Evinrude 3.0 Liter Finger Port B-Spec Sleeve
        • DBR Johnson/Evinrude 3.3 Liter B-Spec Sleeve
      • Pistons >
        • DBR 3.3 Liter B-Spec Piston
      • Pyros
      • Pyro Studs
      • RWF Heads >
        • DBR 3.0 Liter RWF Head
        • DBR 3.3 Liter RWF Head
      • E-Tec Slide Intake
    • Mercury >
      • ECU Reprogramming & Performance Kits >
        • OPTIMAX 300XS ECU Reprogramming & Performance
      • Cowlings and Vents
  • Services
  • Flash My Merc ECU
    • ***Download Release Form Here***
  • Technical 101
    • 300X vs 300XS
    • Engine Combustion Pressure Analysis
    • ECU Re-Mapping 101
  • About Us
    • Our Dyno
  • Contact Us
    • Links and Affiliates
    • For Sale