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.
1995 Tigershark 900
1996 Monte Carlo 900
1995 900 ZXI
1996 1100 ZXI
1996 900 ZXI
1997 1100 STX
1997 1100 ZXI
1997 900 STX
1997 900 ZXI
1998 1100 STX
1998 1100 ZXI
1998 900 STX
1999 1100 STX
1999 1100 ZXI
1999 900 STX
2000 1100 ZXI
2000 900 STX
2000 Ultra 150
2001 1100 ZXI
2001 900 STS
2001 900 STX
2001 Ultra 150
2002 1100 ZXI
2002 1200 STX-R
2002 900 STS
2002 900 STX
2002 Ultra 150
2003 1100 ZXI
2003 1200 STX-R
2003 900 STX
2003 Ultra 150
2004 1200 STX-R
2004 900 STX
2004 Ultra 150
2005 900 STX
2005 Ultra 150
2006 900 STX
