Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hello and thank you for choosing Just Answer. My name is***** will be happy to assist you. Due to both spark plugs firing from same coil, but one side has a brighter spark, indicates that your ignition coil is at fault.
Make sure that the spark plug wire that is on the side with dim spark, does not have a bare spot, that could be partially grounding against some metal part of your engine.