Okay Tim, you got my interest now.
:popcorn:

So how did the Harley Coil work. The early Harley dual coils are at 5 ohm impedance. Is that what the kohler one is? My coil just got a crack in the casing. Maybe the internal oil froze in the extreme cold. Engine breaks up after running g awhilei

Neve bought one. Turns out my buddy with the cub junkyard had a box full of dual coils and I bought one for $5.

I take it you have a KT series on there? I just got a new coil for a KT 19, on another brand of machine. The coil I bought is for a Harley application and wow does this motor start easy now...... And only after I got it I found out that I had one here All the time.. didn't need to buy one. The one I have looks brand new, I think it is supposed to be for a k482 or a k532, but it looks for all the world like many of the Harley coils that I saw pictured on ePay. The one that I bought is a Standard brand, remember the old "Blue streak" line of ignition parts, it is blue.... I'm not at home right now so I don't have the parts number in front of me. I bought that coil from ePay for like $55, looked up the part number on O'Reilly's or advance Auto website and was surprised to see that it came up there for 2x the price. Napa has it too for nearly 3x.

First off, oil doesn't "freeze". Especially oil that thin. Secondly, if it does get cold enough to cause it to turn somewhat solid, oil doesn't expand when it gets cold. Water is the only liquid (there are a few other materials that do) on earth that does this.

I was thinking that maybe there was moisture in the coil. The windings are wound with varnished /insulated wire but the Cooling oil may have had moisture The -15f temps we had for a few days made me suspicious.

The Harley coil; Was it the type that looks like the Kohler (looks like a Can with Plug wires at on end ) or is it the Small Boxy looking type?

https://www.jpcycles.com/product/300...ycles-12v-coil

OR

https://www.jpcycles.com/product/381...e-12-volt-coil

I used a coil from Patton Acres, it was around $120.

I used the Harley 5 ohm coils on a 682 and 782. They both worked great, started a lot easier, and ran smoother. Best of all, they were less than $50

I have done the same thing.

I have used the little square one as a replacement for the jd coil.