NGK 6431 BU8H Surface Gap Spark Plug
Product details
| Management number | 236082559 | Release Date | 2026/07/09 | List Price | US$2.00 | Model Number | 236082559 | ||
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NGK 6431 BU8H Surface Gap Spark Plug.
NGK's Surface Gap Plugs are Nearly Immune to Pre-Ignition, and Usually Require a Special High Energy Ignition System. They Can be Susceptible to Fouling, Especially in Colder Applications, but May be Necessary in High Compression Applications.
Fits Mariner and Mercury outboard engines.
Specifications:
Shell
Thread Size: 14mm
Thread Pitch: 1.25mm
Seat Type: Gasket
Resistor: No
Reach: 12.7mm (1/2")
Hex Size: 13/16" (21mm)
Terminal Type: Solid
Overall Height: ISO
Gap: .016" (0.4mm)
Center Electrode
Material: Nickel
Type: Standard
Size: 2.5mm
Projection: Non-Projected
Ground Electrode
Material: Nickel
Type: Surface Discharge
Torque Specs: Cast Iron: 18-25.3 lb. ft. Aluminum: 18-21.6 lb. ft.
Brand: NGK
Heat Range: 8
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