If you can't start your lawnmower--not even a sputter it might be a problem with getting spark. (You need gas, spark, and compression)

This video is about how to replace and set the gap for an ignition coil on a Bolens 450E lawnmower.

Good news is thats it's very easy! All you need is an 8mm socket, 1/4 socket, and a feeler guage/business card.