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Loosing Spark Again

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1 Dollar

07-19-2007 07:34:25

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On my Unstyled A with a WICO X mag, I have blue spark when it is there, but whenever I can get it started it runs well 80% of the time and kind of hunts/misses the other times. I had it running for 15 minutes just now and 2 or 3 times it completely lost spark and acted like the ignition had been switched off. It would catch itself again and run smoothly, then miss a little, and keep repeating this.

Last time this happened you guys recommended moisture in the mag. Since then I have had the tractor out twice, one of the times being 3 hours and it got fully up to temp etc. It ran well then.

The only thing that I have changed recently was that I set the point gap to .015. (Fixed the slightly yellow spark) It was too wide before.

Does this sound like a bad condenser? Moisture again? Something else?

Thank you again

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John T

07-19-2007 08:56:45

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Re: Loosing Spark Again in reply to 1 Dollar, 07-19-2007 07:34:25

Dollar, That Wico X Mag has a bearing where the older C Mag has a bushing so they do a lil better in that regard. If theres excess shaft wobble running a lil wider points gap may provide temporary band aid relief. That loss of complete spark sounds like they may be some high voltage breakdown or arcing happening possibly from a cap or rotor problem. Id inspect the cap with a fine tooth comb to look for tiny cracks or carbon traces or unusual inner cap terminal or rotor tip problems like oil or moisture (use a hair dryer to heat up n dry her allll out) or carbon build up or shiny brass from rubbing. Make sure BOTH the caps lil springys, where it mates with the coil and the rotor are lining up n mating ok.

If it has the external push to kill button/switch make sure it nor its wiring isnt getting shorted.

If its NOT a cap or rotor problem and happens once all is warmed up, the coil could be breaking down internally or the condensor may be at fault. For no more than they cost Id replace the condensor and the points if they are burned or pitted or carboned up. Also insure the condensor is screwed down tight for a good ground and its wire to the points where the coil wire attaches are alllll l good n clean n tight.

If youre absolutely sure the points n condensor and cap n rotor are NOT at fault (try easy cheaper things first) and the cap is okay but she still seesm to totally shut down ignition wise, then Id suspect the coil is breaking down.

PS you might check the plug wires and use copper core if they need replaced.....

Let us know

John T

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P Browning

07-19-2007 09:33:15

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Re: Loosing Spark Again in reply to John T, 07-19-2007 08:56:45

Hi John -- For some reason I saw WICO X and read WICO C!!! 'Trying to do too many things at one time I guess. The principle remains valid insofar as radial movement of that shaft is concerned. Enjoy life! More later. (PatB)

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John T

07-19-2007 10:26:06

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Re: Loosing Spark Again in reply to P Browning, 07-19-2007 09:33:15

Pat, By the way, you asked a while back about Glen in Tx. I spoke with him on the phone last week, hes fine but been really busy farming so hasnt had time to chat.

Take care

John T

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P Browning

07-19-2007 08:17:20

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Re: Loosing Spark Again in reply to 1 Dollar, 07-19-2007 07:34:25

WICO C magnetos do not have the best track record when it comes to bearings and bushings. Next time you have the distributor cap off, pull the rotor and then perform this simple test: grasp the shaft and see if you can move it sideways. If you can detect radial movement of that shaft, a bearing (or bushing) is give out -- and the result will manifest itself in two ways (1) You may see some copper filings in the cap where the rotor is striking one (or both) terminals, and (2) Setting the points and maintaining that setting is nearly impossible! Just a thought. I have one like that on my hands right now -- and soon it will need to be repaired and/or replaced. (PatB)

Restoration Site, JD-H

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happy deere

07-19-2007 08:02:13

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Re: Loosing Spark Again in reply to 1 Dollar, 07-19-2007 07:34:25

park your amg facing the sun on a warmsunny day open it up and let it bake in the sun hit ti with a blow dryer every hour or so then i would replace the cap gasket

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