Air gap between coil module and flywheel should be .010 inches.
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0.010-0.014"
.010 to .012"
On most lawn mowers there is no timing - they have the flywheel set, as long as the shear pin is in place, it will put the magnet by the coil at the proper time to fire. The points are run by the gap (you set the gap on the points) and the pin pushes the points open at the proper to fire. The only setting you have to do is the gap on the flywheel to the coil and the gap on the points.
The spark plug gap for 2 cycle lawnboys is 0.025
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remove it, get a new one and find out what the gap setting is for the one you replace/ your size engine
you can go to any parts store and buy a feeler gauge for a couple of dollars. use that to set the air gap between the coil and the flywheel. use the oem specs
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.
does it have spark to the plug if not the part you might check would be the coil or the electronic start module probably the latter if it is a newer mower or of ots older then the coil magneto usually dont go bad could be a bad gap between the coil and the magneto if its an older mower could be a bad set of points if its an older mower point gap could be bad spark plug could be bad as I don't know exactly what the lawn mower is doing hard to tell what is wrong
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 air gap on a coil refers to the space between the coil's windings or between the coil and the magnetic core. This gap is crucial for magnetic circuits, as it affects the coil's inductance and the overall efficiency of the magnetic field generated. A larger air gap typically reduces inductance and increases reluctance, while a smaller gap can enhance inductive properties but may lead to saturation in the core material. Properly managing the air gap is essential for optimizing the performance of electromagnetic devices.