I have a friend who bought a used snapper with 4hp briggs. He was using it last fall and let go of the kill handle to empty the grass catcher and the mower stopped as it should, but it would never start back. The first thing I suggested was to unplug the kill switch to make sure it wasn't broken. That didn't work, but I was wondering does unplugging it allow you to start the mower or do you have to put some kind of jumper on. The mower is about 6 years old, but has been well taken care of and had no starting problems before. He said it has a spark. He has changed the spark plug and changed the gas. He wanted to bring it over Sat to let me look at it.