WD mag ?

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Last fall my WD came up lame. It was popping and sounded like it was missing too. We replaced the manifold gaskets but it didn't make any difference. Next we replaced the plugs and wires an it seemed worse. I couldn't find copper core wires locally but NAPA had a wire core set. Some kinda silver braided wire for the core. We started harvest and the WD went in the shed. 
The other day we got around to her again and found the original manifold had a small hole in it. After replacing the manifold the popping was gone but the miss is still there. 

Today when I pulled the plug wire completely off of cylinder 1, 2 or 3 it doesn't change the way the motor runs until you put it near the plug again and when it starts to throw an arc (about a 1/4" away) she smooths right out. It does the same thing with each plug. If I pull #4 the engine dies (it's the shortest wire). So I assume I need a new set of copper wires or is there something else wrong?

Edited by Dave in il - 12 Aug 2011 at 11:31pm

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Dave in il Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 22 Sep 2009 Location: Manville Il Points: 1748	Post Options Post Reply Quote Dave in il Report Post Thanks(0) Quote Reply Topic: WD mag ? Posted: 12 Aug 2011 at 9:25pm
	Last fall my WD came up lame. It was popping and sounded like it was missing too. We replaced the manifold gaskets but it didn't make any difference. Next we replaced the plugs and wires an it seemed worse. I couldn't find copper core wires locally but NAPA had a wire core set. Some kinda silver braided wire for the core. We started harvest and the WD went in the shed. The other day we got around to her again and found the original manifold had a small hole in it. After replacing the manifold the popping was gone but the miss is still there. Today when I pulled the plug wire completely off of cylinder 1, 2 or 3 it doesn't change the way the motor runs until you put it near the plug again and when it starts to throw an arc (about a 1/4" away) she smooths right out. It does the same thing with each plug. If I pull #4 the engine dies (it's the shortest wire). So I assume I need a new set of copper wires or is there something else wrong? Edited by Dave in il - 12 Aug 2011 at 11:31pm

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LouSWPA Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 11 Sep 2009 Location: Clinton, Pa Points: 25083	Post Options Post Reply Quote LouSWPA Report Post Thanks(0) Quote Reply Posted: 12 Aug 2011 at 9:37pm
	I think 295 plugs and solid core wires are required with a mag. If it's tossing an arc like you say i would not suspect the mag, except maybe timing. Try opening the gap on the plugs a little. When you pull the wire off the plug and force an arc at the plug cap, you are actually retarding the timing at that plug. Opening the gap on the plug also is retarding the timing some. I believe "copper core" and "wire core" are the same thing. Just make sure NAPA didn't give you "carbon core" wires.....won't work with a mag Edited by LouSWPA - 12 Aug 2011 at 9:38pm
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DaveKamp Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Apr 2010 Location: LeClaire, Ia Points: 6066	Post Options Post Reply Quote DaveKamp Report Post Thanks(0) Quote Reply Posted: 13 Aug 2011 at 2:27am
	Actually, by lifting the plug wire, you're increasing the amount of collapse time of the ignition coil's field prior to discharge, and the result, is a higher arc voltage... hence, the plugs were slightly fouled, and lifting the plug wires cleared the foul. What I think is more likely, is that the manifold leak, over time, was affecting scavenging, hence manifold vacuum and mixture, and someone compensated by twiddling with the air/fuel ratio. Now that you changed the manifold, vacuum is higher, and the mixture is either substantially richer (not re-adjusted yet), or substantially leaner (adjusted too far) hence, not firing. Try leaning out the mixture a bit, then lifting the plug wires a tad 'till the cylinders fire... then re-land 'em and see if it resumes a clean-smooth run. Also keep in mind that if you've got ethanol blends, a little gas-water, or a plugged air-bleed passageway, it'll do that stuff, too.

Dave in il Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Joined: 22 Sep 2009 Location: Manville Il Points: 1748	Post Options Post Reply Quote Dave in il Report Post Thanks(0) Quote Reply Posted: 13 Aug 2011 at 7:06am
	From what you're saying I should start by checking the plugs and regapping them. If that doesn't fix it, then try leaning out the fuel mix. I have a manual over at the shop but does anyone know what gap to set the plugs. I couldn't get Autolight 295 plugs locally so I bought the plugs at AGCO and they just have a part# on them. Could the wrong heat range plugs be the problem?