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: 1mm.

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

Ground Electrode:
Material: Nickel.
Type: Standard.

Specifications:
Resistor: No.
Resistor Value: 1K Ohm.
Heat Range: 6.
Torque Specs: Cast Iron: 18-25.3lb, ft Aluminium 18-21.6lb ft.
Longevity: 30,000 miles.

NGK Spark Plug BP6HS-10 is suitable for the following models of marine engines:

Outboards:
Mercury: 3.5hp 1983-1994.
Nissan: NS2.5A, NS3.5A.