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Cylinder 1 and 4 are not firing, but the coil seems to be fine. What?

  • Thread starter Thread starter TortillaChip
  • Start date Start date
T

TortillaChip

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1980 GS850 here. 17k miles. The problem is that cylinders 1 and 4 fire great, but 2 and 3 do not. The bike runs but has a ton of trouble idling and sounds bad, as two cylinders arent really doing their thing.

Naturally, I changed the spark plugs. No change. Then, I figured the coil was faulty. I replaced it with a used original, and the problem was unchanged.

Next, I figured it might be a problem with the ignition. So, I replaced the Pick up coil. This also caused no change.


Context: The bike ran perfectly well last summer. I winterized it, put it away, and now this. So something happened while it was stored away.

Now I'm confused. I took the coil that was giving fine spark and hooked it up where the other coil was, and it did not get spark, suggesting that the original coil I replaced wasn't actually faulty. My thoughts? Something with the wiring must be bad. Maybe a short? What do you think? I have not replaced the spark plug hats. thats probably my next one to try.
 
Last edited:
Did you try swapping the coils to see if the problem stays on the same cylinders or follows the coil swap?


Mark
 
I'm looking up as much as i can read on igniters, but i'm not understanding. could you explain more about it? How is it different from the voltage regulator?
 
Check the connections from ignition coils down to ignitor- maybe a mouse gnawed on a connector. Put the old pickup coil back on to be safe.
 
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