How to Test a Small Engine for Spark
If your small engine isn't starting, you'll need to diagnose many issues including the spark plug. This video walks you through the steps of how to test for a spark using a spark tester.
Remove top cover, and pull-cord side cover. Disconnect sparkplug and ground wires. Remove and replace ignition module, held in by 2 Allen screws. Use a ordinary business card as a spacer to set the air gap between the flywheel and ignition module. Tighten Allen screws and replace covers.