Grab a soda can rip the top and bottom of it flattened the can and stick it between the coil and the magnet
dollar bill
0.020
Almost all (if not all) B&S engines have a .030 plug gap.
0.010-0.014" is the Briggs spec
You can check the Briggs and Stratton website for the exact specs for you engine number. OR Most people use a standard business card between the flywheel and coil. That works fine. Just line up the coil flanges with the magnet part of the flywheel and the put the business card between them. The magnet will hold it in place. Then tighten the bolts holding the coil and you are ready to go.
go to B&S site they have all gap setting for every engine they have made.
The gap should be about .0125 in. (.3175 mm.) or the thickness of heavy paper.
The gap should be between .006 and .010 if it has aluminum clylinders. The gap should be between .010 and .014 if it has cast iron cylinders.
The easiest way is to use a standard business card between the coil and the magnet part of the flywheel.
I think what you are wanting is the air gap between the flywheel and the coil . The gap is somewhere around .002 in , but if you will take 2 matchbooks take off the covers and use them for spacers between the coil legs and the flywheel . Role the flywheel around till the magnet pulls the coil in . Place the matchbooks between the coil arms and the flywheel and tighten the screws . Check the spark plug and make sure you have good fire .
most likely a spark problem... check coil pack then wires and spark plugs. most people are too darn lazy to change back set of plugs, so the gap increases as the plugs wear as the gap increases more current is required to bridge the gap this causes your coil/s to run hotter, and eventually the coil fails. Recommend replacing coil pack plugs, and wires
The coil is usually held on by two small bolts. Loosening the bolts will allow the coil to move closer or further from the flywheel. Use a feeler gauge to set the gap between the flywheel and the coil arms. Re-tighten the bolts when your done.