# BU8H NGK Standard Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Standard Spark Plug – Part Number: BU8H**

Spark plugs are a critical engine component, providing the spark that ignites the air-fuel mixture that drives an engine. NGK spark plugs feature trivalent plating – a silver/chrome-coloured finish on the threads – for corrosion resistance against moisture and chemicals, and are designed to meet or exceed OE standards.

## ⚙️ Key Features

-   Standard nickel centre electrode
-   Trivalent metal plating provides superior anti-corrosion and anti-seizing properties
-   Corrugated ribs reduce the risk of flashover
-   Pure alumina silicate ceramic insulator, providing superior strength and better heat transfer
-   Copper core aids in heat removal
-   Triple seals prevent leakage

## 📏 Specifications

-   NGK stock number: 6431
-   Thread: 14 mm
-   Reach: 12.7 mm (1/2 in)
-   Hex: 20.8 mm (13/16 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: Surface Discharge

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment.

-   Mariner 275 (275 HP, 1994-1991) – Outboard Engine
-   Mariner 2.5L EFI (265 HP, 1997) – Outboard Engine
-   Mariner 2.5L EFI (260 HP, 1998-1995) – Outboard Engine
-   Mariner 250 3.4L (250 HP, 1990-1989) – Outboard Engine
-   Mariner SUPER MAGNUM EFI (225 HP, 1999-1997) – Outboard Engine
-   Mariner 220 MAGNUM EFI (220 HP, 1988-1987) – Outboard Engine
-   Mariner 200 (200 HP, 1999-1979) – Outboard Engine
-   Mariner 200 EFI (200 HP, 1999-1998) – Outboard Engine
-   Mariner 200 MAGNUM EFI (200 HP, 1997-1989) – Outboard Engine
-   Mariner 200 SUPER MAGNUM EFI (200 HP, 1997) – Outboard Engine
-   Mariner 175 (175 HP, 1998-1978) – Outboard Engine
-   Mariner 175 EFI (175 HP, 1999-1998) – Outboard Engine
-   Mariner 175 MAGNUM EFI (175 HP, 1997-1991) – Outboard Engine
-   Mariner 175 SKI (175 HP, 1994-1989) – Outboard Engine
-   Mariner 150 (150 HP, 1999-1979) – Outboard Engine
-   Mariner 150 EFI (150 HP, 1999-1997) – Outboard Engine
-   Mariner 150 MAGNUM (150 HP) – Outboard Engine
-   Mariner 150 MAGNUM EFI (150 HP, 1997-1993) – Outboard Engine
-   Mariner 150 MAGNUM II (150 HP, 1991-1988) – Outboard Engine
-   Mariner 150 MAGNUM III (150 HP, 1997-1992) – Outboard Engine
-   Mariner 150 WORK (150 HP) – Outboard Engine
-   Mariner 140 JET (140 HP, 1999-1995) – Outboard Engine
-   Mariner 135 (135 HP, 1999-1986) – Outboard Engine
-   Mariner 135 MARATHON (135 HP, 1999-1986) – Outboard Engine
-   Mariner 135 WORK (135 HP, 1993-1986) – Outboard Engine

That is the 25 most common of 43 applications NGK's charts list for this plug – ask us to check yours.

## 🔄 Supersession & Cross Reference

NGK's cross-reference tables list this plug against these part numbers.

-   DENSO: 6038, SF24

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 18.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 18.00 AUD | In stock |

## Images

- BU8H NGK spark plug
- BU8H NGK spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/bu8h-ngk-standard-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03