The coil has two bolts to hold it in position. Loosen both bolts, place a .010 - .014 feeler gauge (or business card) between the coil and flywheel, and tighten bolts. The size of the gap determines the timing of the engine.
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 .
What I do at the shop is fold abusiness card in half . Put it in between the Coil and Flywheel. Bring the magnet around to Coil and tighten screws down. Perfect gap!
Air gap between coil module and flywheel should be .010 inches.
You can use a standardbusiness card for the gap.
dollar bill
.012" to .020"
20 thousandths of an inch will suffice. Fairly forgiving ..........loosen the coil and place a standard business card between flywheel and coil. Allow magnetic force from flywheel to pull together and sandwich card between flywheel and coil. Tighten coil. This will work fine.
The magneto air gap is a precision measurement that's taken between the edge of the flywheel and the ignition coil armature. The flywheel and the crankshaft are held together in alignment by the flywheel key.
0010-0.014" and a normal business card serves as an easy to find gauge.
If you are talking about a small engine such as a lawn mower, the air gap between the coil and the flywheel is usually is .015 to .020 of an inch. A piece of cardboard from a cereal box can be used as a gauge if you don't have the proper gauges.
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.
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.