A spark plug seals the combustion chamber. It conducts a spark that is generated in the ignition coil into the combustion chamber and provides a gap for that spark to jump across. Finally, it conducts the heat it picks up in the combustion process to the cylinder head and into the cooling system. Since 1936, NGK has built itself to be the world's leading spark plug manufacturer. NGK's spark plugs have a triple-gasket sealing process which helps them to withstand the roughest ride. A solid copper core increases spark and heat transfer and the longer insulating nose prevents fouling. The double dipped zinc-chromate shells resists corrosion and rusting.
Over time jet ski spark plugs can deteriorate from producing the spark. When this happens, it changes the spark plug gap causing irregular spark and missing. You don't have to wait to change your plugs. When you do change them, however, wait for the engine to be cold. Do notchange them when the engine is hot or warm because it could cause you to cross thread it by putting a cold spark plug in an heated up expanded hole.
2000 GTX DI
2000 RX DI
2001 GTX DI
2001 RX DI
2002 GTX DI
2002 LRV DI
2002 RX DI
2003 GTX DI
2003 LRV DI
2003 RX DI
2003 XP DI
2004 XP DI
2006 3D 947 DI
2007 3D 947 DI
2004 Sportster LE DI
2005 Sportster LE DI
2006 Sportster LE DI
