How do you set the air gap and magneto on a lawn mower?

Answer by  BlueEyes3b5 (121)

Ya gotta go to a small engine shop or a home depot and pick up a gap tester. The air gap between a flywhell and the coil should be. 012 but that could vary depending on the make and model of your mower.

Answer by  Annika5 (171)

You can purchase a Magneto Coil and and Condenser Tester which will check magneto windings using a comparison method. There is also a bench test that you do using a metal bench and a piece of isolating material like wood or plastic that is placed between the coil and bench.

Answer by  ParisianParlay (30)

I have no clue how to set the air gap but I would think that your owner manual should have some troubleshooting tips in it. If not try calling the manufacturer. Most companies are more than happy to spend a few minutes explaining how to do repairs on their product.

Answer by  Anonymous

Move the flywheel magnet to the opposite side of the magneto. loosen the screws that hold the magneto on, place a credit card between the magneto and the flywheel and retighten the screws. Remove the credit card. It's set.

Answer by  Anonymous

Most lawnmower magnetos set at .010 to .012. I measured a credit card and found that it was almost .030. This is too thick. A piece of writting paper is .003, so if you fold it four times you have a cheap feeler gage. Hope this helps.