Champion Spark Plug - CJ8

Product Details & Features

The Champion Spark Plug – CJ8 is a dependable, OEM-quality ignition component engineered to deliver reliable starting and consistent combustion in a wide range of small petrol engines. Built with Champion’s copper core electrode technology and engineered to the correct heat range for smoother running, the CJ8 helps ensure stable engine performance, reduced fouling and strong throttle response — ideal for handheld outdoor power tools, garden machinery and light-duty engines.

Designed to meet or exceed original equipment specifications, the CJ8 spark plug is a trusted replacement choice for professionals and homeowners seeking durable, efficient ignition performance across various petrol-powered equipment.

Key Features

• Champion OEM-Standard Spark Plug – Manufactured to Champion’s original quality requirements for dependable fit and performance.

• Copper Core Centre Electrode – Improves electrical conductivity and effective heat transfer for optimal combustion.

• Balanced Heat Range (8) – Engineered for the correct operating temperature to reduce fouling and support smoother running under diverse loads.

• 10 mm Thread Diameter – Suits many compact two-stroke and four-stroke small engines.

• 19 mm (3/4") Reach – Correct thread length for compatible heads on appropriate small petrol engines.

• Resistor Suppression – Helps minimise electrical interference with ignition systems and electronics.

• Part Reference: CJ8 – Confirms correct Champion plug identification and application.

Technical Specifications

• Product Type: Spark Plug

• Brand: Champion

• Part Number: CJ8

• Thread Diameter: 10 mm

• Reach (Thread Length): 19 mm (3/4″)

• Hex Size: 16 mm (5/8″)

• Heat Range: 8

• Electrode Type: Copper core centre electrode with standard ground electrode

• Suppression: Yes (Resistor)

Suitable Machines / Compatible Models

The Champion CJ8 spark plug fits a variety of small petrol engines typically found in garden and outdoor power equipment. Typical compatible applications include:

• STIHL chainsaws, brush cutters and trimmers

• Husqvarna handheld petrol tools

• Echo brush cutters, trimmers and blowers

• Makita petrol garden machinery

• Other small two-stroke and four-stroke engines requiring a heat range 8 plug

(Exact fitment depends on engine model and production year — always verify against your machine’s official parts diagram or existing plug specification before ordering.)

Typical Compatible Applications

The CJ8 spark plug is commonly used for:

• Petrol chainsaws

• Brush cutters and trimmers

• Hedge trimmers

• Leaf blowers

• Petrol lawn and garden machinery

Designed to support smooth starting, consistent idling and reliable combustion where correct heat range and ignition characteristics are crucial.

Parts This Spark Plug Replaces / Cross References

The Champion CJ8 may be a direct replacement or cross-reference for equivalent spark plugs with matching specifications, including:

• NGK BM8A (matching heat range and thread size)

• Bosch WSR8F / equivalent specification

• Other brands with 10 mm thread, 19 mm reach and heat range 8

(Always confirm any cross-reference compatibility with your specific engine’s requirements before substitution.)

Fitment Tip

To ensure correct spark plug performance and engine reliability:

1. Check the part number on your existing spark plug and match it to your engine’s specification.

2. Confirm thread size, reach and heat range before installation.

3. Inspect and set the correct electrode gap according to the manufacturer’s service manual.

Correct fitment helps optimise combustion efficiency, reduce misfiring and protect the engine from poor running conditions.

Why Choose the Champion CJ8 Spark Plug

The Champion CJ8 spark plug delivers reliable ignition performance with a well-balanced heat range suitable for a broad set of small petrol engines. Its copper core construction and resistor suppression help ensure consistent starts, reduced fouling and smoother engine operation. As an OEM-standard replacement option, the CJ8 offers durability, dependable performance and long-lasting service compared with many generic alternatives — keeping your outdoor equipment operating efficiently through varied tasks and conditions.