The Champion Spark Plug – CJ7Y is a high-quality replacement ignition component engineered to deliver reliable performance for a wide range of small petrol engines. Designed with Champion’s proven copper core technology and optimised heat range, the CJ7Y ensures consistent spark delivery, improved combustion efficiency and dependable starts — making it a trusted choice for garden machinery, handheld tools and light-duty power equipment. Crafted to OEM-equivalent standards with robust materials and precise construction, the CJ7Y spark plug helps promote smoother idle, reduced fouling and stable throttle response — ideal for both professional users and homeowners maintaining outdoor power equipment. Key Features OEM-Quality Champion Spark Plug – Built to original Champion manufacturing specifications for reliable ignition and accurate fitment. Copper Core Centre Electrode – Enhances conductivity and effective heat dissipation for better combustion performance. Optimised Heat Rating (7) – Suited for engines requiring a slightly hotter plug to resist fouling and sustain performance under varied loads. 10 mm Thread Diameter – Standard size for many two-stroke and small four-stroke petrol engines. 19 mm (3/4") Reach – Correct thread length for compatible cylinder heads on appropriate power tools. Resistor Suppression – Helps minimise radio frequency interference (RFI) with onboard electronics and ignition systems. Part Reference: CJ7Y – Confirms correct Champion identification and application. Technical Specifications Product Type: Spark Plug Brand: Champion Part Number: CJ7Y Thread Diameter: 10 mm Reach (Thread Length): 19 mm (3/4″) Hex Size: 16 mm (5/8″) Heat Range: 7 (Hotter profile than CJ6Y) Electrode Type: Copper core centre with standard ground electrode Suppression: Yes (Resistor) Suitable Machines / Compatible Models The Champion CJ7Y spark plug fits a variety of small petrol engines typically found in handheld outdoor power equipment. Typical compatible applications include: STIHL chainsaws, trimmers and blowers Husqvarna handheld two-stroke engines Echo brush cutters and hedge trimmers Makita petrol-powered garden tools Small petrol engines across a range of lawn and garden machinery (Always verify fitment against your specific engine’s parts manual or the plug reference of your existing spark plug before ordering.) Typical Compatible Applications The CJ7Y spark plug is commonly used for: Petrol chainsaws Brush cutters and trimmers Hedge trimmers Leaf blowers Lightweight petrol garden machinery Providing dependable starts and smooth operation where correct heat range and ignition characteristics are essential. Parts This Spark Plug Replaces / Cross References The Champion CJ7Y may be a direct replacement or cross-reference for equivalent spark plugs with matching specifications, including: NGK BM7A (equivalent heat range and thread size) Bosch WSR7F / equivalent Other brands of spark plugs with matching thread, reach and heat range (Always confirm cross-reference compatibility with your machine’s recommended specifications prior to fitment.) Fitment Tip To ensure correct spark plug performance and engine reliability: Confirm the part number on your existing spark plug matches your machine’s specifications. Verify thread size, reach and heat range before installing. Check and adjust the electrode gap according to the engine manufacturer’s recommendations. Correct fitment reduces fouling, supports efficient ignition and helps protect your engine from misfires or poor running. Why Choose the Champion CJ7Y Spark Plug The Champion CJ7Y delivers dependable ignition and combustion performance with a carefully selected heat range suited for a broad range of small petrol engines. Its robust copper core design, resistor suppression and OEM-standard construction make it an excellent replacement option to maintain consistent starts, smoother operation and lasting service life compared with generic alternatives — helping keep your outdoor equipment running reliably through regular use and demanding conditions.
