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You can use a standardbusiness card for the gap.
dollar bill
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.
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.
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 .
The coil is under the cowling on top of the motor where the flywheel is.
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.
The easiest way is to use a standard business card between the coil and the magnet part of the flywheel.
Spin the engine until the two legs of the coil lines up with the magnet on the flywheel. Place a standard business card between the the flywheel and coil and let the magnet hold it in place between the two pieces. Tighten the bolts down. Spin the engine and get the business card out and you're ready to go.
You can not set the timing. It is determined by the keyway between the flywheel and the crankshaft. It only goes in one place. You can adjust the coil, the valves and the carburetor.
There is no way to adjust the timing on a 17.5 Briggs engine. The magnet is on the side of the flywheel and there is only one way the flywheel can line up. All you can do is make wure that the coil is gapped correctly.
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!