Testing And Replacing Your Small Engine’s Ignition Coil. It’s easy to learn about and check the ignition coil in your small engine. That’s why if you’re having ignition system trouble, you may want to first check on the ignition coil. You need to remember to be careful around any rotating, moving parts or any other potentially dangerous areas when you are trying to start up your engine or your equipment. To test your coil or armature, you first you need to clip one of the ends of the spark tester to the ignition cable. Make sure that the other end is grounded to the cylinder head. Now you need to spin the flywheel rapidly, to approximately 350 RPM. Observe for the spark in the tester window and if you see that the spark jumps the tester gap, meaning that your ignition coil is working just fine. If you see that your spark jumps the tester gap, that signifies that your ignition coil is working okay. If while you’re running, your engine quits, you need to hook the tester up between the ignition cable and the spark plug and proceed to start the engine. Monitor the window when the engine stops. Here are a number of things you need to do to replace the ignition coil in your small engine: You must detach the spark plug wire and secure it. If there are any batteries in there, you must remove it. Now, remove the old ignition coil (armature) mounting screws. Disconnect the stop switch wire from the flywheel brake and remove the coil. Use mounting screws to attach a replacement coil from the original engine manufacturer. Push the armature away from the flywheel and then tighten one screw. Position the flywheel in a way that caused the magnets to be on the opposite side from the armature. Use a shim and place it between the rim of the flywheel and the ignition coil (armature). Turn the flywheel, while holding the shim until the magnets are exactly adjacent to the armature. You can now loosen the tight screw so that the magnets pull the ignition armature against the flywheel and shim. Now, tighten both of the mounting screws and rotate the flywheel until you free up the shim slips. Last of all, you can reconnect the stop switch. If you are looking for small engine repair services in Ottawa, mobile car battery boosting, lawn mower and lawn tractor repairs and tune-ups, or snow blower repairs then give us a call to book your mobile small engine repair today. We fix, repair, and tune-up small engines such as lawn mowers and snow blowers. The best part is that we come to you so no more waiting in line or traveling back and forth to fix your small engine equipment.