Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Run circuit shows a relay.
K 1 relay. It is what shuts off the fuel solenoid. You could always remove the file solenoid! It is ant-backfire solenoid and really serves no other function, other than keeping engine from backfiring once when the key is turned off hot! Not used on older models.
Unplugging the solenoid should keep engine from starting! It has to be removed or the inner parts removed to disable it.
Engine just has a coil and magnet in the flywheel to make the spark. Remove the kill wire from the coil and see if engine continues to run. If it does, the kill circuit is being grounded by safety switch. If not, the engine is just stalling and the carburetor and fuel supply are not passing the fuel. Engine is either losing fuel or spark.
Engines stops when wire is removed? starts and runs, but still shuts off? Have you removed and cleaned te carburetor and check the flow to the carburetor inlet? This has the pulse fuel pump, so is the pulse line open to the crankcase and you feel the pulse if you remove hose and check with finger?
Good job! Thanks for the update.