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JD Model B Rotor

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Chuck in Michig

05-22-2002 11:21:38




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Just got my newest toy home, it's a 1950 (S/N 269065) Model B. It is in great shape but won't start. Fuel system looks fine, but there is no fire at the plugs. It has a Wico XH 1042 mag as the ignition system. I pulled the cap and rotor and changed the points and condenser as well as checking the resistance of the coil to make sure that it wasn't shorted or opened. Everything seems fine. I just got back from the local JD dealer with a new cap and rotor. My question is this, the guy that I bought this tractor from swears that it ran last summer, but the rotor that I bought from JD only has one metal lug coming off of it (like normal rotors) but the rotor that was on the tractor when I brought it home has two metal lugs (about 90 degrees apart) on it. Which one is right? And why the two lugs? And does anyone know the right words to say to convince your wife to hold onto the plug wire while you crank the tractor?

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Mark Scholten

05-23-2002 04:07:39




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
You grab the plug, have someone else crank the engine and then tell you wife, "Honey, hold my hand".



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mike

05-22-2002 19:18:01




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
I thought I'd try wrapping some money around the spark plug wires. I'll probably get the wife and the kids ! And maybe even some congressmen !!



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John T

05-22-2002 15:12:05




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
Chuck, the reson for the two tipped rotor (on mags that run at crank speed and fire TDC on both compression and exhaust) is that the first leading tip fires the top plug wire (left #1) while the lagging second tip fires the bottom one (right #2). On distributors, theres only a single rotor tip which fires #1 when pointed to it and #2 180 crank degrees later when pointed to it. Wico made both true mags (no external power required) plus battery powered distributor units. A coil can show low DC voltage and current continuity you know and still be bad due to high voltage breakdowns. IE just because it passes a continuity test dont mean shes necessarily good. Good luck Ol John T

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F-I-T

05-22-2002 13:42:01




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
How about "I heard Clooney's wife does it for him ?!?"

On the Wico Dist/Mags with 2 leg rotor, the plug wires exit not at 180* from one another. When one leg rotor is lined up with it's respective wire, the other rotor leg is 180* across from it's plug wire.

Frank-in-Tallahassee
70D // 855



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Mikey G

05-22-2002 13:27:38




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
Chuck My guess is that your points corroded over the winter and you have fixed that problem use your old rotor just clean the "arms" end with a point file or fine emery cloth. I like the wife idea but I dont have the guts to try it.I use a spark tester goes between the wire and the plug .

Good luck Mikey G



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Walt in Jaxn, Tn.

05-22-2002 11:46:44




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 Re: JD Model B Rotor in reply to Chuck in Michigan, 05-22-2002 11:21:38  
on the xh, "two" metal posts, blades, ect. tell the wife it will take years off her skin and tone her muscles (how fast can you run)



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