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: 0.9mm.

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: 5.
Torque Specs: Cast Iron: 18-25.3lb, ft Aluminium 18-21.6lb ft.
Longevity: 30,000 miles.

NGK Spark Plug B5HS is suitable for the following models of marine engines:

Outboards:
Archimedes-Penta: 6, 7.5, 9, 14, 1975.
Carniti: 3.5HP, 8HP, 25HP.
Crescent: 14, 14E.
Mariner: 2HP 2A(646), 2B(6A1) 1993 - 1994, 6HP 6B(678) 1993 - 1995.
Suzuki: DT2 1987 - For Asia, DT2.2 For Asia.
Valmet Oy: Terhi 5.5VV.
Volvo-Penta: 90, 140, 150, 151, 180, 181, 210, 211, 212.
Yamaha: 5D.
Zundapp: 304-03 L5,L6, 304-04 L5,L6.

Inboards:
Volvo-Penta: AQ60F, BB30F, MB18F.