If it's a troybilt tiller (chicken scratcher)Lol. I had 2 of them. The coils are notorious to spark and then next time no spark. In the spring and summer I had garden for a few years and it's the carb. Had to clean it a couple of times. Just to small.Spark plug bad, check spark. Try take out the coil, clean seats for good ground, adjusted at distance to flywheel (card method is good), check spark again.