Spark generator? I am assuming that you are referring to the ignition coil.
You should have gapped these ignition coils to spec, I assume that you did.
First, check for spark on BOTH cylinders after the engine dies and verify that you do have an ignition problem. If you have no spark, disconnect the white wire to the engine that grounds the ignition coils. Look for the white wire to be burned, pinched, or chaffed under the blower housing.