Magnetos are not mysterious nor difficult to maintain. They are “mysterious” only because there are not a lot of people out there who truly understand ‘em. And if a mag is kept clean and dry it will generally require LESS frequent maintenance than a distributor.
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A big advantage of magneto is your tractor will still run without a battery, generator, etc. – the magneto is completely independent, self-contained ignition. (All you need is a good arm - or a short pull - and your tractor will go.)
However as ADLM points out in his post, magnetos have only two automatic timing settings: crank and run. A distributor OTOH has a centrifugal advance which automatically adjusts the timing in over a range of RPMs. Means that a distributor-equipped tractor may use slightly less fuel under certain speed/load conditions. Also a distributor generally can be timed so the engine can idle smoothly at lower RPM than with a mag, yet will permit the engine to develop maximum power at governed RPM.
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Were the tractor mine and it was originally equipped with a magneto, I’d leave it that way!
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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