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JD A magneto timing....

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Tommy Boy in PA

08-22-2002 18:10:51




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I have been working on a 1940 JD A handstart. It was stuck so I had to tear it down. I didn't do anything but a valve job and rings. The problem, if there is a problem, is with the position of the connector in the housing where the mag attaches. The book says that when the impulse mark on the flywheel is lined up with the mark on the tractor, the connector should be horizontal. When I follow the proper proceedure mine is in between horizontal and vertical. How could this have happened? It ran before I tore it down. I haven't tried to start it yet. I am waiting for a gas tank. Thanks for any and all help and or thoughts on this subject.

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Clooney

08-22-2002 18:53:53




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 Re: JD A magneto timing.... in reply to Tommy Boy in PA, 08-22-2002 18:10:51  
Tommy, there are a few reasons you are seeing what you are;
~The first is the possibility the flywheel is installed wrong. [remove the L/H petcock & put a pencil in the hole then slowly turn the flywheel in the forward direction until the piston just touches the pencil then mark the flywheel at the case mark, then turn it in the opposite direction until the piston again touches the pencil & mark the flywheel at the case mark, 1/2 way between the flywheel marks is the real TDC & it should be the same as the L/H impulse mark on the flywheel, if it isn't the flywheel is on wrong] ~The second is you are using the wrong case mark. [the slot in the flywheel should be parallel with the ground when the L/H impulse mark on the flywheel is lined up with the case mark, if not you are using the wrong mark]
~The third is the governor is installed wrong & the mag's running advance was messed with to make it run. [if the flywheel is on correctly & the case mark is correct you will have to either pull the governor & rotate the shaft until the mag drive flange has the slots running fore/aft of pull the left hand governor cover & try to move the inner shaft/gear until the mag drive flange is correct. ~What brand & model mag do you have so we can give you the impulse stop ring initial setting for the running timing on the mag?

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Tommy Boy in PA

08-24-2002 19:24:45




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 Re: Re: JD A magneto timing.... in reply to Clooney, 08-22-2002 18:53:53  
Thanks for the excellent info. I will let you know how I make out. I will get busy and check for proper timing.



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