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  #11  
Old 04-12-2021, 07:28 PM
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Default Coil surprise

This is a surprising solution to me. A coil is just a transformer, and by and large, they're pretty efficient components. While I can imagine one failing, it's hard to understand one getting weak (though I've heard of this before). Perhaps if the oil/coolant (they are oil filled, no?) gets contaminated the unit would lose efficiency .

Strange but I'm really glad you found it. This kind of problem can drive you nuts!
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  #12  
Old 04-12-2021, 07:47 PM
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Quote:
Originally Posted by jbrewer View Post
This is a surprising solution to me. A coil is just a transformer, and by and large, they're pretty efficient components. While I can imagine one failing, it's hard to understand one getting weak (though I've heard of this before). Perhaps if the oil/coolant (they are oil filled, no?) gets contaminated the unit would lose efficiency .

Strange but I'm really glad you found it. This kind of problem can drive you nuts!
Usually they short between the high voltage windings and it will fire with a plug laying on the head but fail under compression.
Also the primary can be shorted, what was your ohm readings? within speck?
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  #13  
Old 04-12-2021, 09:23 PM
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Years ago, my friend was into Garden Tractor pulling and my job was to tow him to the start line with another narrow frame. It would be a 300-400 trip from pit spot and every time we got to a particular spot where we were leaning sideways a little on a hill, the tow tractor would die. Damn, now we're pushing two tractors by hand! Turns out to be the coil. We believe it was oil shorting the coil.
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  #14  
Old 04-13-2021, 09:24 AM
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Thanks for adding to the info gang. It looks to be the original coil and looking straight down into where the plug wire goes, you can see some oil. ol'George, the old coil is well within spec @ 4.0Ω / 8,720Ω....however it was the only thing I changed and then the engine came to life. I suspect you are correct in that it's failing under pressure.

The new coil has slightly lower resistance numbers both primary and secondary. FYI, this is on my almost completed 147 with a fresh engine rebuild, new battery, new VR and new Porch Electric wiring harness.
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  #15  
Old 05-14-2021, 06:34 PM
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Originally Posted by TheSaturnV View Post
3Ω resistance

My secret distributor is Amazon.



Works great, the true test will be to see how long it lasts...
Help us less fortunate with a link...?
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  #16  
Old 05-16-2021, 07:28 PM
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Well that's funny, you and I have the same 2 Cubs: 147's & 882's

Here it is:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
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  #17  
Old 05-16-2021, 07:34 PM
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I ordered up one of those coils after you posted this. I wanted to have one as a spare and that price was tough to beat. The one I got was from China.
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  #18  
Old 05-23-2021, 08:51 PM
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Can you help school me on how to check for a weak/non functioning coil? Is this done with a multi meter some how?

Thanks
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  #19  
Old 05-24-2021, 07:09 AM
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Quote:
Can you help school me on how to check for a weak/non functioning coil? Is this done with a multi meter some how?
It is done with a Multi-Meter (DVM or VOM). I don't know what to look for in a "weak" coil.
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  #20  
Old 05-24-2021, 04:53 PM
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And that's precisely what made this so difficult to diagnose. The old coil metered within spec, showed spark at the plug and the engine more or less ran, but not very well.

I went around in circles from the carb to the points to the valves. Once the new coil was installed it immediately came to life.

"How do you know if your spark is weak?

The engine will be weak, the unburned fuel will foul the spark plug, and the exhaust will pop. If the mixture is excessively lean, the engine will misfire since the fuel molecules in the intake air are too far apart."

My K321 stumbled on acceleration no matter the carb settings, the exhaust popped and overheated and the plug was fouling. I'm sure there's an instrument out there that can tell us what the output of my old coil was while it's actually operating, but at this point I am completely satisfied that replacing it with a new one did the trick.

Finally:

"What causes ignition coils to go bad?

Wear and tear. Wear and tear is a common reason for ignition coils failing. It causes degrading of the insulation between the primary and secondary coil windings and the primary coil. The reduction in insulation can cause the coil to overheat."

I'm also satisfied that what looks to be the original, approx 50 year old coil has likely seen its share of wear and tear.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

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