NGK CR5EH-9 SPARK PLUG

Function and technical context

The spark plug is part of the outboard engine's ignition system and is responsible for generating the electrical spark that ignites the air-fuel mixture inside the combustion chamber. In Honda four-stroke engines, this component works under conditions of high temperature and cyclic pressure, so its condition directly influences the efficiency of the combustion process. A worn electrode or an incorrect gap causes misfires, loss of power, increased fuel consumption and difficulties in starting the engine. The NGK CR5EH-9 spark plug is designed to meet the technical requirements of Honda engines that specify this reference, guaranteeing a consistent and reliable spark in each cycle.

When to replace this part?

The most common symptoms that indicate that the spark plug needs replacement are: difficult or irregular starting, jerks and speed losses during acceleration, increased fuel consumption and, in advanced cases, jerky operation or unexpected engine stops. For Honda outboard engines, it is recommended that the spark plugs be inspected at each seasonal service and replaced at the interval indicated in the engine manual, usually between 100 and 200 hours of operation or once a year for recreational use. Changing the spark plugs preventively is one of the lowest-cost interventions that exists and avoids more serious—and more expensive—breakdowns while sailing.

Equivalent manufacturer part numbers