Spark plugs are a vital component of your marine engine ignition system, as they supply the spark that ignites a mixture of air and fuel within the cylinders of your engine, thus creating a combustion that makes your engine operation.

A pure alumina silicate ceramic insulator provides superior strength and heat transfer, whilst a copper core aids heat removal. Corrugated ribs prevent flashover and triple seals prevent leakage.

Technical Specifications:

Shell:
Thread Diameter: 14mm.
Thread Pitch: 1.25mm.
Hex Size: 21mm.
Reach: 12.7mm.
Seat Type: Gasket.
Terminal Type: Removable Nut.
Gap: 0.7mm.

Centre Electrode:
Material: Nickel.
Type: Standard.
Size: 2.5mm.
Projection: Non-Projected.

Ground Electrode:
Material: Nickel.
Type: Standard.

Specifications:
Resistor: Yes.
Resistor Value: 5K Ohm.
Heat Range: 7.
Torque Specs: Cast Iron: 18-25.3lb, ft Aluminium 18-21.6lb ft.
Longevity: 30,000 miles.

NGK Spark Plug BR7HS is suitable for the following models of marine engines:

Outboards:
Evinrude: 40HP 1984-1993.
Johnson: 10HP 2006, 10HP RHLSRC, RHSRC, RLSRD, RSRD 2004, 10HP RHLSTS, RHSTS, RLSTE, RSTE 2003, 10HP RRHLSOR, RHSOR, RLSOS, RSOS 2005, 15HP LSRS, RSRS, WRLSRM, WRSRM 2004, 15HP 2006, 48HP 1989-1993, 50HP 1989-1994.
Mariner: 15HP W15(662)/M15(662) 1992 For CDN, 25HP K25(6A4) For CDN, 25HP M25(694) 1992 For CDN, 30HP 30A(689) 1992-1994 For CDN, 40HP M40(6F6)/K40(6F5) 1992-1996 For CDN.
Spirit: 16HP Spirit 16, 20HP Spirit 20, 25HP Spirit 25, 50HP Spirit 50 - 1978.
Suzuki: DT9.9 -1997, DT15 - 1997, DT15C, DT20 - 1997, DT25C - 1997, DT30 - 1997, DT30C - 1997
Yamaha: 2C 2006, 4A 2001, 4AC (4), 4AS, 4B 2001, 4BC, 5C, 5CS, 40J 2001, 40X - 2000, 2003, MJ700FX/SJ/TZT/XL, MJ-SJ700 2002.
Yamaha Enduro Model: E40G, E40J (E40), E40X (E40) 2001, E48C (E48).
Yamaha Water Vehicle: FX700 1997-1998, SJ700B-E 2006 For EU, WB700A/AX.