Repco High Energy Ignition Spark Tester - RST400

Repco High Energy Ignition Spark Tester

Chasing a no-start or stubborn misfire? This Repco spark tester lets you confirm ignition health quickly and safely, so you’re not throwing parts at a problem. By verifying spark without having to start the engine, you can pinpoint issues fast, protect components, and get your vehicle back to reliable running sooner.

Designed for real-world versatility, it works across traditional ignition, modern electronic/HEI and DIS setups, plus small 2- or 4-stroke engines including lawnmowers, motorcycles and marine applications. Simply connect it in-line between the spark plug and the plug wire or coil lead, then observe spark while cranking or with the engine running. A steady flash confirms a healthy system; a weak or intermittent flash helps you zero in on faults like failing coils, leads or connections—before they strand you or your customer.

Compact, durable and easy to use, this Repco specialty tool earns its keep in any toolbox. Whether you’re troubleshooting your daily driver, tuning a bike or maintaining marine and garden gear, it gives you clear answers in minutes and helps you diagnose with confidence.