50850 Ignition spark tester

The Lisle ignition spark tester provides a safe and efficient way to diagnose ignition system health without removing the spark plug from the cylinder head. By connecting the spark plug wire boot to the tester and grounding the tool, you can observe the spark while cranking the engine. It features an adjustable calibration screw that allows you to simulate specific spark plug gaps, helping to identify weak coils or faulty leads on motorcycle ignition systems. This tool is particularly useful for troubleshooting intermittent firing issues or verifying spark strength across different engine cycles. Lisle remains a trusted name for diagnostic equipment in the service industry.