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.
Yamaha:
1998 GP 800
1999 GP 800
2000 GP 800
2000 XL 800
2001 GP 800R
2001 XL 800
2002 GP 800R
2002 XLT 800
2003 GP 800R
2003 XLT 800
2004 GP 800R
2004 XL 800
2005 GP 800R
2005 LX 210
Sea-Doo:
1993 GTX
1993 XP
1994 Explorer
1994 GTX
1994 SPX
1994 XP
1994 XPI
1995 Explorer
1995 GTX
1995 HX
1995 SPX
1995 XP
1995 XP 800
1996 Explorer
1996 GSX
1996 GTI
1996 GTX
1996 HX
1996 SPX
1996 XP
1997 Explorer
1997 GS
1997 GSI
1997 GSX
1997 GTI
1997 GTS
1997 GTX
1997 HX
1997 SP
1997 SPX
1997 XP
1998 GS
1998 GSX Limited
1998 GTI
1998 GTS
1998 GTX Limited
1998 GTX RFI
1998 SPX
1998 XP Limited
1999 GS
1999 GSX Limited
1999 GSX RFI
1999 GTI
1999 GTS
1999 GTX Limited
1999 GTX RFI
1999 SPX
1999 VSP-L
1999 XP Limited
2000 GS
2000 GSX RFI
2000 GTI
2000 GTS
2000 GTX
2000 GTX RFI
2000 LRV
2000 RX
2000 VSP-L
2000 XP
2001 GS
2001 GTI
2001 GTS
2001 GTX
2001 GTX RFI
2001 LRV
2001 RX
2001 RX DI
2001 VSP-L
2001 XP
2002 Explorer
2002 GTI
2002 GTI LE
2002 GTX
2002 GTX RFI
2002 RX
2002 VSP-L
2002 XP
2003 GTI
2003 GTI LE
2003 GTI LE RFI
2003 VSP-L
2004 GTI
2004 GTI LE
2004 GTI LE RFI
2004 GTI RFI
2005 3D RFI
2005 GTI
2005 GTI LE RFI
2005 GTI RFI
1994 Speedster
1995 Speedster
1995 Sportster
1996 Challenger
1996 Speedster
1996 Sportster
1997 Challenger
1997 Challenger 1800
1997 Speedster
1997 Sportster
1998 Challenger
1998 Challenger 1800
1998 Speedster
1998 Sportster
1998 Sportster 1800
1999 Challenger 1800
1999 Speedster
1999 Sportster 1800
2000 Challenger
2000 Sportster
2000 Sportster LE
2001 Challenger
2001 Sportster LE
2002 Sportster LE
2002 Sportster LT
2003 Sportster LE
Kawasaki:
1992 750 SS
1992 750 SX
1993 750 SS
1993 750 SX
1993 Super Sport Xi
1994 750 SS
1994 750 SX
1994 ST
1994 Super Sport XI
1994 XIR
1995 750 SS
1995 750 SX
1995 750 SXI
1995 750 ZXI
1995 ST
1995 STS
1995 Super Sport XI
1996 750 SXI
1996 750 ZXI
1996 SS
1996 STS
1996 Super Sport XI
1997 750 SXI
1997 750 ZXI
1997 SS
1997 STS
1997 Super Sport XI
1998 750 STX
1998 SXI PRO
1998 Xi Sport
1999 SXI Pro
1999 Xi Sport
2000 SXI PRO
2001 SXI PRO
2002 SXI PRO
2003 800 SX-R
2006 800 SX-R
2007 800 SX-R
2008 800 SX-R
2009 800 SX-R
2010 800 SX-R
2010 STX
2011 800 SX-R
