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1949 farmall cub magneto

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DanfromKY

01-04-2005 20:49:27




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Someone in their infamous wisdom converted my tractor that I have restored over the past year by turning the magneto into a distributor. I"ve returned the magneto back to the way it is suppose to work. My problem is...the timing is off slightly...meaning that I can"t turn the magneto far enough for the pointer and timing mark to match up for top dead center. I"ve turned the magneto as far as I can toward the engine block but the timing mark is still slightly above the pointer. Whats going to be the easiest way to correct what needs to be corrected?

My thinking leans towards moving a tooth forward or backward inside the magneto. Whatdaya say guys?

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George Willer

01-05-2005 07:21:15




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 Re: 1949 farmall cub magneto in reply to DanfromKY, 01-04-2005 20:49:27  
Dan,

The Cub is unusual in that it's the *governor* that has to be timed correctly. This is because the governor gear acts like an extra idler gear in the mag drive train. There is a timing mark on the *rear* face of the governor gear and the idler gear that must be aligned. You may have to remove the mag drive seal in order to see it. It has to be right in order for the mag drive slot to be in the right place.

George Willer

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Bob

01-05-2005 03:33:52




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 Re: 1949 farmall cub magneto in reply to DanfromKY, 01-04-2005 20:49:27  
You'll have to change the timing ny a tooth or so between the mag drive and the cam gear. Messing with the gears inside the mag, that drive the rotor WON'T affect when the points open (impulse trips), and you will screw of the mag by putting the points and rotor out of sync.



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