A spark plug is a device that is used in internal combustion engines, including those found in Kawasaki jet skis Sea Doo's Yamaha waverunners, Honda aquatrax, to ignite the fuel-air mixture in the engine's cylinders. The spark plug consists of a ceramic insulator that is surrounded by a metal shell and a central electrode, which extends into the engine's cylinder.

When the spark plug is activated by an electrical current, it creates a spark that ignites the fuel-air mixture in the cylinder. This spark must be strong enough to ignite the mixture, but it must also be carefully controlled to avoid damaging the engine.

Spark plugs are critical components of an engine, as they are responsible for starting the engine and keeping it running smoothly. They must be able to withstand the high temperatures and pressures found in the engine's cylinders, and they must be able to generate a consistent spark to ensure reliable ignition.

NGK Jet ski spark plugs are typically made of high-quality materials, such as copper, nickel, or platinum, to ensure that they are durable and able to withstand the harsh conditions found in a Sea Doo Yamaha Polaris Honda Kawasaki jet ski engine. They are also designed to be resistant to fouling, which can occur when excess fuel or carbon accumulates on the spark plug and interferes with its operation.

Proper maintenance and care of the spark plugs is important to ensure that a jet ski runs smoothly and efficiently. This includes regularly checking the spark plugs for wear and replacing them as needed, and keeping them clean and free of debris.