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  #21  
Old 05-24-2021, 08:31 PM
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drglinski drglinski is offline
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Quote:
Originally Posted by TheSaturnV View Post
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.


Thanks Saturn 5!
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  #22  
Old 05-25-2021, 09:02 AM
SGragg SGragg is offline
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Good thread. Thanks to all for the info.
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  #23  
Old 05-25-2021, 05:10 PM
Ambush Ambush is offline
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I sure learn a ton from just reading every new thread/post!

After rebuilding the K321, I had it running before a new coil had showed up, so I just left it. And it has had a high RPM miss. Well this morning, I took the half hour and put the new coil on and went loading dirt. The miss is gone!

Thanks again to all the generous with their time and knowledgeable OCC members.
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  #24  
Old 05-25-2021, 07:45 PM
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TheSaturnV TheSaturnV is offline
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Oh man, that is great to hear.
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  #25  
Old 07-22-2022, 06:51 PM
twoton twoton is offline
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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.
...and I installed it on my 1650 two months ago and it failed today, Go figure...
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  #26  
Old 07-23-2022, 09:08 AM
finsruskw finsruskw is offline
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Oh, thanks. Just curious 'cause I just ordered one of these today for one of mine that was leaking oil;

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

I'll be curious to hear how yours stands the test of time...
I'm afraid it looks as though your 1 year warranty may just have gone the way of the Edsel
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  #27  
Old 07-23-2022, 01:47 PM
Mytractor Mytractor is offline
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How interesting that you found the issue was in the coil. I have a 129 and I am not able to get the high and low set on the carb. Between the timing and coil, this maybe my problem?

Cheers Eric
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  #28  
Old 07-23-2022, 03:29 PM
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RLause RLause is offline
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Here is for you techies out there. 40 years ago I worked for a company that used a servo amplifier that used tubes ie fire bottles. The tubes required approximately 250 vdc that was supplied by a small transformer. When the amplifiers quit working which they did quite frequently, the transformer would be hot. The high voltage winding would short adjacent turns together which would overload the transformer. One turn being shorted together would not affect the resistance of the winding. The only way to actually detect the problem to apply a pulse to one of the windings and monitor with an oscilloscope. A good transformer would ring as opposed to a bad one with a shorted winding. Just my 2 cents.
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