Toro model 20072, six years old. Would not start and after checking out YouTube videos, I determined coil was shot. Lots of great videos on YouTube on how to troubleshoot lawnmowers and engine systems.
The old coil would not produce spark. Checked around town here and price for new coil was way too high ($60). I bought mine online for $22.09 with free shipping but you can find them for under 20.00. Part came from Kansas and took just 3 days. Type of “coil” that can be used on this model is “Stens 440-505 Solid State Module”.
When I received the coil I noticed it was missing one rivet on the laminated core. To avoid delays in fixing lawnmower I decided to repair coil rather than returning it to Amazon for a replacement. I hunted up a steel tube rivet and made a “washer” out of a small steel nut by grinding it thinner, clamped laminations with vise grip pliers, and then hammered down the tube rivet end using a 7.5 mm doming punch (dapping punch). It worked great 
Make sure you plug the wire back on the coil terminal (bottom side of installed coil on mower) after installing your new coil. Don’t torque the screws too tight on the mower as it has aluminum parts. You can set the coil gap using a plastic card (not embossed one).
Hope video will help you on your project in getting your mower running again. Take care and good luck on your mower troubleshooting William
Post time: Jun-18-2017