# CMR7A NGK Standard Compact Spark Plug | Genuine NGK Spark Plug

## 🔧 Product Description

**NGK Standard Compact Spark Plug – Part Number: CMR7A**

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: 7543
-   Thread: 10 mm
-   Reach: 9.5 mm (3/8 in)
-   Hex: 16 mm (5/8 in)
-   Seat: Gasket
-   Terminal: Solid
-   Type: Compact

## 🚘 Application

Listed in NGK's application charts for 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.

-   Ryobi RY09466A (30cc) – Outdoor Power Equipment
-   Trimmer/Brushcutter/Powerhead RY13016 (30cc) – Outdoor Power Equipment
-   Trimmer/Brushcutter/Powerhead RY34005 (30cc) – Outdoor Power Equipment
-   Trimmer/Brushcutter/Powerhead RY34426 (30cc) – Outdoor Power Equipment
-   Trimmer/Brushcutter/Powerhead RY34446 (30cc) – Outdoor Power Equipment
-   Edger FC73, FC83 – Outdoor Power Equipment
-   Hedge Trimmer HL73 – Outdoor Power Equipment
-   Stihl HT70, HT75, HT73 – Outdoor Power Equipment
-   Turf Equipment (KOMATSU) – Outdoor Power Equipment
-   Trimmer 51930 (1HP FULL CRANK TORO) – Outdoor Power Equipment
-   Trimmer 51932 (1HP FULL CRANK TORO) – Outdoor Power Equipment
-   Trimmer 51934 (1HP FULL CRANK TORO) – Outdoor Power Equipment
-   Komatsu – Power Equipment Engine

## 🔄 Supersession & Cross Reference

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

-   Champion: 978, RY4C

## 📦 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

- CMR7A NGK spark plug

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/cmr7a-ngk-standard-compact-spark-plug-genuine-ngk-spark-plug)
> Updated: 2026-09-03