Posted by Earl-IL on February 23, 2013 at 12:49:52 from (50.81.209.158):
In Reply to: John Deere A magneto posted by MikeinInd on February 22, 2013 at 21:29:06:
You said you cleaned the points? Point contact finish needs to be as good as you can make it. The 2 surface on the points need to have a mirror finish,not a filed or coarse sand paper finish.Check this surface with a magnify glass. Polish with 1000 grit. Some of the new points we get today are miss aligned and poor finish. check the spring terminal in the cap for corrosion. Pay close attention to the screws in the rotor are not sticking up higher than the carbon in the middle of the rotor and rubbing on the cap to rotor contact. Is the rotor tight on the shaft? It can't flop around. I have had the point pin worn to where the points will slide ,before they break.This throws the timing to the edge gap off. I have new pins. Some times you will need to gap points to .016 -- .017. If your mag has a kill button disconnect & test.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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