Your engine has a Capacitive Discharge Ignition System. No points or condenser or 12volt power required to the coils. There is a kill wire to each coil that is grounded by the key switch to kill the spark and shut down the engine. That ground connection comes from the yellow wire on the key switch. You can try cutting that wire to see if you then get spark and rule out a bad key switch. You can also check if you have 12 volts to the fuel solenoid on the carb with the key in the start and run positions.
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