Cause of no spark can be determined by process of elimination. Good to have a new sparkplug on hand to eliminate plug as fault. So start by replacing plug with new or test plug on mower /edger etc. for spark. If plug ok, then temporarily remove the wire connected to oil alert system (oil alert will ground coil if oil low or dirty). With oil alert unpluged, and no spark suspect sparkplug boot or coil. The sparkplug boot threads on to the spartplug wire and is what actually fits-on to the spark plug. You can test the coil by removing the boot and inserting piece of paperclip wire, or small screw into end of the coil wire and hold close to engine ground while pulling rope. If still no spark suspect coil. If spark, replace the boot. Good luck with repair.
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