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If it's on a hand-start tractor, pull off a sparkplug wire(either one), hold it so that a spark can jump(1/8-1/4") from the block or plug and turn it over. As you do so, you should hear a loud click. That's the magneto. Since you have only one wire off, you might have to turn it over twice to get a spark at that wire. If it's on an electric start, pull a plug wire, hold it a proper distance, and turn it over. It's a lot easier when all you have to do is push down on the starter! If you've got the magneto off, you MUST hold it in the position that it mounts on the tractor. The direction that the impulse lug turns does make a difference. If it doesn't click turning one way, then turn it the other way. You should feel a spring tightening, and then release with a loud click. The impulse lug will spin about 1/2 turn rapidly and is guaranteed to whack your knuckle. If the spring doesn't catch, release, and make the loud click in either direction, then the magneto is not working. To see if there is spark, fashion a wire so that it fits tightly in the sparkplug wire hole and bend it so that it creates a spark gap with metal on the magneto. You should be able to see a spark jump. If you're REALLY brave(and a glutton for punishment) you can hold the wire AND the magneto at the same time and turn it over. No, sometimes a mag will produce so weak of a spark that you can't get it to jump. That's when you grab on to the wire yourself. If you can get it to jump a gap, don't grab it yourself. On your other question, no- a magneto does not neeed a certain rpm to work.
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