NGK BPR5EFS-13 SPARK PLUG

Function and technical context

The NGK BPR5EFS-13 spark plug is part of the ignition system of the outboard or stationary engine, being responsible for generating the electric spark that ignites the air-fuel mixture in the combustion chamber at the precise moment of the engine cycle. Its correct function guarantees complete and efficient combustion, which directly translates into optimal power, adjusted fuel consumption and controlled emissions. A bad spark plug causes misfires, jerks during acceleration, excessive fuel consumption and, in advanced cases, damage to the ignition coil or the piston itself due to irregular combustion. The NGK reference BPR5EFS-13 incorporates the suffix -13, which indicates a factory-set air gap of 1.3 mm, eliminating the need for manual calibration at assembly.

When to replace this part?

The most common symptoms of a worn or fouled spark plug include difficult cold starting, unstable or vibrating idle, noticeable loss of acceleration and increased petrol consumption with no apparent cause in the installation. For outboard engines in nautical use, NGK recommends checking the spark plugs every 100 hours of operation or at the beginning of each navigation season, proceeding with their preventive replacement even if the visual wear is slight, since the inner electrode may be eroded without being noticeable to the naked eye. Changing the spark plugs preventively before going out into open navigation prevents breakdowns at sea and ensures that the engine responds reliably in any working condition.

Compatibility table