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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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