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 Type.
Gap: 0.6mm.

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

Ground Electrode:
Material: Nickel.
Type: Standard.

Specifications:
Resistor: No.
Resistor Value: 1K Ohm.
Heat Range: 8.
Torque Specs: Cast Iron: 18-25.3lb, ft Aluminium 18-21.6lb ft.
Longevity: 50,000 miles.

NGK Spark Plug B8HS is suitable for the following models of marine engines:

Outboards:
Archimedes-Penta: 20, 25S, 45, 55, 60, 70, 1975.
Carniti: 15HP, 18HP, 45, 55, 65, 80, 90, 100HP, 700Sport, 850Sport, 1000Sport.
Crescent: 4.5, 5A, 35, 35E, 55, 55E, 55S, 55Tornado, 60, 70F, Drive45.
Mariner: 40HP 40A (676A), 40B (675B), 40C (6E9), W40 (676A), 55HP Marathon 55 (6A3) /W55 (663), W55 (6A3).
Sea-King: 9.9HP 1980 - 1986, 15HP 1978 - 1986, 35HP 1978 - 1979.
Sears: 25.0HP.
Suzuki: DT40W - 1997, DT48M - 2000, DT55C - 1992, DT55M/MQ - 2000, DT55TC For CDN - 2000, DT60W - 1997, DT65C - 1992, DT65TC For CDN - 2000, DT75, DT75C - 1992, DT75MQ/W/WT - 1993, DT75TC - 2000, DT85, DT85C - 1992, DT85TC - 2000, DT115, DT115C - 1990, DT140, DT140C - 1990, PU40 - 1993, PU55 - 1993, PU85 - 1993, PU140 - 1993.
Volvo Penta: 200 1975, 280, 300, 330, 350 1975, 400 1975, 450, 550 1975, 600, 700.