(0502195) Evinrude/Johnson Champion 2-Stroke Spark Plug (UL77V)

The UL77V most commonly refers to a Champion Marine Spark Plug (part number 831), specifically a surface gap plug designed for marine and small engine applications. It is widely used in outboard and inboard marine engines, particularly those from OMC, and is known for its durability and corrosion resistance in wet environments. 

Champion UL77V Spark Plug Specifications

• Shell Thread Diameter: 14mm.
• Reach: 1/2 inch (12.7mm).
• Hex Size: 13/16 inch (21mm).
• Core Material: Copper core with nickel alloy electrodes for increased conductivity.
• Spark Gap: 1.02 mm (approximately 0.040 inches).
• Type: Surface discharge (non-projected).
• Resistor: This is a non-resistor plug. 

Key Performance Benefits

Expert and user feedback highlights several key characteristics of this model:

• Longevity: Users note that while surface gap plugs like the UL77V can be prone to fouling in certain conditions, they "almost last forever" once running.
• Corrosion Resistance: Emphasizes its triple-coated shell, which is specifically engineered to withstand harsh marine conditions.