Champion UL77V Spark Plug

Function and technical context

The spark plug is the component responsible for generating the electrical spark that ignites the fuel and air mixture inside the combustion chamber of the outboard engine. It operates in the ignition system and is subjected to continuous cycles of high voltage, pressure and extreme temperature with each engine revolution. A worn spark plug causes incomplete or irregular combustion, resulting in loss of power, increased fuel consumption and difficulty starting the engine. The Champion UL77V is manufactured to deliver constant and reliable spark, ensuring efficient combustion and optimal engine response under all navigation conditions.

When should this part be replaced?

The most common symptoms of a deteriorated spark plug include difficult starting or multiple attempts, unstable idle or jerking during acceleration, notable increase in fuel consumption and presence of soot or deposits on the electrode when visually inspecting the spark plug. On recreational outboard engines it is recommended to check the spark plugs at each seasonal maintenance and replace them approximately every 100 operating hours or when detecting any of the above symptoms. Changing spark plugs preventively is one of the most economical and effective interventions to avoid unexpected breakdowns at sea and ensure full engine performance.

Compatibility

Equivalent manufacturer references