Well, some say .012", ... but really .... Just use a thin piece of cardboard or paperboard about the thickness of a matchbook cover and you'll be all set.
SOURCE: cant get a spark on my briggs and stratton 4hp engine, trying to
gap from coil to flywheel is .010. if you've replaced coil, points and condenser with no spark i would try replacing the coil and points with an magnetron kit or a coil that allows for the elimination of points.
SOURCE: briggs and stratton lawnmower 4horse power engine needegap specs on coil and points
That's easy man! You will always hear, "You sir, need to gap this or that at EXACTLY .00071542 inches per square meter".
The actual "poor boy fix"-
Put your magneto back on there, and stick a business card from your wallet in between it and the rotor. Let the magneto pull itself to it, you center it, and give it just a hair of breathing room (to slide the card back out). Tighten 'er down, and you got it.
1.- If you can't pull the card out, it is too tight.
2.- If you pull the card out easily, too loose.
3.- JUST enough to pull it out, and have it drag just a bit on the way out is JUST ENOUGH!
Remember, on 4-strokes, they ARE forgiving, and can do miracles even if you try your best to destroy them.
SOURCE: Homelite Mighty Lite Lawn Trimmer Magneto Air Gap setting 25cc
Normall setting is 10 thou but if there is no play in the crank bearings you can set at 8 thou
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