NGK YR5IX IRIDIUM SPARK PLUG

Function and technical context

Spark plugs are the component responsible for initiating combustion in petrol engines by generating a high-voltage electrical spark in the combustion chamber. The NGK YR5IX spark plug belongs to the iridium range, where the central electrode is made of this high melting point alloy, which gives it an outstanding ionization capacity and a resistance to erosion much higher than that of conventional nickel electrodes. In the marine environment, continuous exposure to humidity and saline environments accelerates the deterioration of ignition components; The iridium electrode of this spark plug resists these corrosive agents effectively, keeping the ignition gap stable over longer periods of use. An ignition system in perfect condition is essential to guarantee immediate starting, complete fuel combustion and optimal engine response at any load regime.

When to replace this part?

The most common symptoms of a worn or bad spark plug include difficulty starting when cold or hot, jerking and misfiring at idle or under load, increased fuel consumption and the presence of black smoke in the exhaust due to incomplete combustion. Unlike conventional nickel spark plugs, iridium spark plugs allow longer replacement intervals; However, in marine engines it is recommended to inspect them during each seasonal maintenance and consider their preventive replacement if the engine exceeds the hours of use recommended by the engine manufacturer. Changing the spark plugs preventively before starting the season prevents unexpected stops in the water and ensures that the engine responds reliably from the first start.

Equivalent manufacturer part numbers