# B4ES NGK Standard Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Standard Spark Plug – Part Number: B4ES**

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: 4129
-   Thread: 14 mm
-   Reach: 19 mm (3/4 in)
-   Hex: 20.8 mm (13/16 in)
-   Seat: Gasket
-   Type: 14mm Spark Plugs cont'd

## 🚘 Application

Listed in NGK's application charts for marine, motorcycle, ATV and snowmobile equipment and lawn, garden and commercial equipment. The chart shows a 0.5 mm gap for these engines, but check it against your engine's manual before fitting.

-   B.S.A. M21 - ALUMINUM HEADS (600) – Motorcycle
-   B.S.A. C10 - ALUMINUM HEADS – Motorcycle
-   B.S.A. M20 - ALUMINUM HEADS – Motorcycle
-   B.S.A. M21 - ALUMINUM HEADS – Motorcycle
-   Nissan H20 (1980 MODEL) – Industrial Tractors & Lift Truck
-   Nissan H30 (1980 MODEL) – Industrial Tractors & Lift Truck
-   Nissan J15 (1980 MODEL) – Industrial Tractors & Lift Truck
-   Nissan MA10 – Industrial Tractors & Lift Truck
-   Nissan P40 (1980 MODEL) – Industrial Tractors & Lift Truck
-   Nissan Z24 – Industrial Tractors & Lift Truck

## 🔄 Supersession & Cross Reference

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

-   Motorcraft: AG5C, AG7, AG9, AG9U
-   Champion: 504, B7, N21
-   Bosch: W9C, W9CC
-   DENSO: 6009, W14E
-   ACDelco: 47XL
-   Autolite: 398
-   Torch: F5C

## 📦 Condition

-   Brand new genuine product
-   Supplied in original packaging

## Details

- **Price:** 10.0 AUD
- **Vendor:** NGK
- **Type:** Ignition & Controls

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 10.00 AUD | In stock |

## Images

- B4ES NGK spark plug
- B4ES NGK spark plug firing end

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/b4es-ngk-standard-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03