NGK BP6ES SPARK PLUG

Function and technical context

The NGK BP6ES spark plug is part of the outboard engine's ignition system, being responsible for generating the electrical spark that ignites the fuel and air mixture in each combustion cycle. Its high-precision nickel central electrode ensures a stable and consistent electrical arc, which translates into complete and efficient combustion in each cylinder. In the marine environment, where humidity, salt and sudden temperature variations subject components to accelerated degradation, the thermal stability of this spark plug is decisive in maintaining engine performance. Poor ignition causes loss of power, increased fuel consumption and, in severe cases, starting failures that can leave the boat without propulsion.

When to replace this part?

The most common symptoms of a worn or bad spark plug include difficulty or irregularity when starting cold, jerking or "backfiring" during acceleration, unstable idle and a noticeable increase in petrol consumption. As a general rule, it is recommended to check the spark plugs at each seasonal maintenance and replace them every 100 hours of boating or once a year, whichever comes first, to ensure reliable ignition. Changing spark plugs preventively is one of the most economical interventions available and prevents unexpected breakdowns at sea or far from port.

Compatibility table

Equivalent manufacturer part numbers