What is the gap between coil and magneto - Garden

I see anywhere from .030" (.76mm) - .035".. the smaller gap will be easier for the magneto to fire...and probably run better at low speeds..

I assume you mean the gap between the magneto coil and the magnet on the flywheel. Usually you just adjust the gap to be as small as possible without them touching.

Clifton, take a business card, slip it between the coil and magneto,loosen up the screws on the coil and when it bites against the magneto, tighten them back up, turn the flywheel by hand to make sure the coil doesn't hit..It's a very thin gap and this is the easiest method I teach all my customers. Good luck

The gap between the flywheel and magneto (pick-up coil) is not that critical, if your engine is not running right or won't start. 2 to 3 mm is fine. The key point is that the gap be uniform in the arc where the fly wheel passes it. Please post your symptoms and we can better assist you on the forum. If you are not getting any spark from the plug wire... check this at night by unplugging the plug boot and pulling the cord and watching; if you can't detect a spark... then you have a magneto issue or a bad spark plug wire. A little crokus cloth to rub the rust off the entire flywheel edge surface will help. Don't sand down or apply solvents to the magneto surface even if it's rusty!

The gap is .010. You can also use a card to gap the coil and after you tighten the coil and remove the card turn the flywheel by hand one revolution to make sure the magnet does not rub on the flywheel.

To test magneto leave properly mounted and gapped to the motor. unplug black wire from magneto. Crank motor and test for spark. If you get spark with the wire unplugged then the magneto is fine and your problem is in the wiring system, likely a safety switch. If you have no spark with the wire unplugged then the magneto is bad and needs to be replaced.
BTW, the black wire is a ground. That is what shuts the motor off when you turn the key to off or when you get out of the seat, etc. So the motor will not shut off with that wire unplugged. Also, putting any voltage on that wire will immediately damage the coil.

Hi,

Have you checked the magneto and the valves for the right gap size?

Ignition module gap
Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.

If you have more questions or need additional help please reply below and I will get back to you. HTH & Good Luck.
Lou
Thank You for using FixYa.

Ignition module gap
Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.

If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

FIRST check the gap of the flywheel magnet to the magneto coil. Use a business card as a spacer and adjust the gap. If unit has points rather than electronic triggering, check those and timing and gap.