I have a 94' Toro walk-behind with a 12.5hp Kohler engine. I bought it used at the beginning of the season hoping to maybe get two seasons out of it since it is an older mower. Anyway, started it up the other day, finished my lawn, and then the next morning it wouldn't start. I checked it for gas (learned that the hard way) and it had gas. Then I took the spark plug out and replaced it with a new one. I checked for a spark and there was nothing, does this mean it needs a magneto or something? I don't know a ton about these engines.