Craftsman riding lawn mower with a kohler engine?

my moms riding lawnmower sat over the winter time and when i went to start it up last week it would crank all day long but not start and run has gas in tank getting gas to carburator... new battery didnt do trick either however there is no spark to the spark plug. i unscrewed it with it attached to plug wire and crank engine but there is no spark.. ive exhausted all my options on where to diagnose now.. any suggestions thanks|||You're going to have to ground the plug while you watch for a spark in the spark plug gap. Hold the threads of the plug against bare metal on the engine while you crank it over.|||You have a coil and a set of points or a module you have to have the coil tested then you know if it is the module . If you have a set of points just give their faces a good clean with very fine emery paper.|||I had a mower that had the same problem. I had to pull the flywheel off and use steel wool on the magnet that is embedded in it. It had gotten rust on it and it wouldn't fire the plug. It had a magneto system, I don't know if yours is the same or not. But after I did that and put it back together, it ran fine.