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Hangin' with the cool kids
Ontario, Canada
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2,574 Posts
Discussion Starter · #1 ·
I always figured a coil either worked or it didnt.....My 12 hp Kohler "K" engine was running bad, wouldnt rev, backfiring, heating the exhaust pipe so it glowed red.....I went through the carb, changed plug, points, condenser etc......When I changed the coil, that solved the problem. I guess the coil was not firing all the time and possibly at the wrong time.......I have never seen this before...I couldnt see the coil arcing in the dark, like it was cracked or something....Anyone else ever have this happen?
 

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Red Tractor Nut & Diesel Addict
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32,409 Posts
Oh yes they can be. Had many over the years fire just enough to run, but not run right. Had a motorcycle that was acting up and took the tank off to check the coil connections. All looked good till I turned off the shop lights, then fired it up. Seen tiny sparks coming from the coil to the laminate plates. Changed coil out & all was fine.
 

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Registered
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695 Posts
1/2 bad IS bad. you have good and bad no in between. though it depends on "how" the coil fails within, as to what exact symptoms you may experience/
I agree.

Another situation...My coils (or ignition modules to some) seemed to work fine on my Kohler Command in my Ariens Grand Sierra. I tested the coils while I had the engine out doing the unfortunate/usual head gasket & oil seal replacement. One coil tested bad, but it ran fine. It had the recalled coils in it, so I went ahead and put 2 new coils in it to be safe. I used Kohler coils in it as I didn't want to chance having to pull the motor again to access the coils for replacement. I'll use aftermarket on a vertical shaft engine with semi-easy coil access. A horizontal shaft engine on a tractor, not so much. :D
 

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Cub Cadet Collector
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1,457 Posts
I've had a couple that would work intermittently. Also had a couple that would show spark on the tester but was to weak to jump the plug electrodes.
 
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