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-   -   Left coil not producing spark (http://www.xs11.com/forum/showthread.php?t=38347)

warpin987 10-05-2012 10:10 PM

Left coil not producing spark
Hey Everyone,
I just joined this forum today! About a month ago I bought a 1979 XS1100F. It wasnt running at the time and still isn't. I am having problems getting spark out of the left coil (Cylinders 1 & 4). I have tried replacing the ignition coils, and checking the resistance. I have tested the wiring going up to the ignition coils and all checks out. I read in the manual to check the voltage on each terminal of the TCI box and I am getting proper reading. Any suggestions before I replace the TCI box?

crazy steve 10-05-2012 10:26 PM

Probably a broken pick-up wire... look here: http://www.xs11.com/forum/showthread.php?t=543

natemoen 10-05-2012 10:32 PM

TCI rarely fails, nearly positive it is going to be pickups.

WMarshy 10-06-2012 03:58 AM

Check the connector that the red wires from the coils plug into. That double female connector can fail from fatigue, I had to replace mine once...

warpin987 10-15-2012 03:47 PM

Thanks for the help so far guys! That patch had already been done once on the pickup coil wires. I couldnt find any splits the way the walkthrough said, but did it again. Still no spark. I checked all the plug connections, lubed them with dielectrical grease. I am getting proper resistance from testing the plug that goes into the TCI box. Is there anything else you all could think of that could be?

John Warpinski

warpin987 10-15-2012 03:49 PM

Do the actual pickups go bad? Does anyone know where to get any pick up coils?

John Warpinski

DAVINCI 10-15-2012 03:51 PM

Sure...could be the solder joints inside the box. If your resistance readings are correct, your pickups are OK. No telling, though, if there are intermittent breaks in the wires.

warpin987 10-15-2012 04:50 PM

So the wires could be split all the way up to the plug behind the fuse box? Any easy way to replace that?

DAVINCI 10-15-2012 06:41 PM


I am getting proper resistance from testing the plug that goes into the TCI box.
Was this a mis-statement? Or did I misinterpret it? It appears to claim that you already have tested the pickups from the TCI, no?

TopCatGr58 10-15-2012 07:19 PM

Hey John,

The PU wires are fragile, and after 30+ years, they don't handle the constant flexing very well, and IF the repair was just soldering together the old wires, then that's where you should look more closely for additional intermittent breaks. The wires don't split up the line to the TCI, just around the PU coils where they are flexing so much.

As Davinci stated, the solder joints on the TCI where the external prongs are soldered to the PCB can go bad, and resweating/soldering them can correct problems. DO NOT try to take the PCB out of the TCI box, just take the cover off and access the solder joints directly.

PU coils can go bad, but that is also rare.

warpin987 10-19-2012 12:43 AM

So After testing the tci box a little more I am not getting any voltage out of the white/red connector on the TCI box. Is it the box or wiring? I re soldered and still no voltage.

CaptonZap 10-19-2012 10:57 AM


Originally Posted by warpin987 (Post 392939)
So After testing the tci box a little more I am not getting any voltage out of the white/red connector on the TCI box. Is it the box or wiring? I re soldered and still no voltage.

That is the power input to the TCI, so if you don't have any voltage present, go check the rear fuse in the fuse box. There should be 12 volts at the tan wire, then through the fuse to the red/w wire. If you have it there, there is a open in the r/w wire going to the TCI. The run/ stop switch might be in the wrong position, or disconnected. CZ

warpin987 10-27-2012 02:08 PM

Thank you for all your help. It was the TCI. I ordered a used one off ebay, plugged it in, now have spark to all the cylinders. No have a problem with the carbs. Took them apart to clean them only to find that the Float pin holder in my outer left side carb was cracked off. The float pin doesnt sit right and is bent so the float doesnt work correctly. So my question is now this, would the outer left side carb fit from an xs750? My friend has an extra set that I could buy from him if it does.

warpin987 10-27-2012 02:12 PM

Here is a picture of it

**Hey Warpin**, to post the photo and have it show, in Flicker, click on the SHARE drop down, then select the HTML/BB Code, then grab the bbcode, it will actually be several sets of codes....temporarily paste all of it into a notepad window, then find the code with the {IMG} tags in front and behind the URL html code, copy it and then paste it into the thread/post and it will display like this!


That break is actually the easiest to repair because you still have the bottom portion of the post that cradles the float pin. You can get new pins, or just use a brad nail or similar piece of smooth metal, make sure it's small enough to slide thru the float portion without hanging up or sticking! It does not need to have a large head or such on either end, nor does is need to be a snug fit, the float BOWL will keep the pin from falling out once the bowl is in place.

Take a small drill and drill a small hole thru the base of the float post, then get some SS security wire and use it to secure the new float pin to the post base, the other side/post will secure the other end just fine.


natemoen 10-27-2012 05:01 PM

Nope, 750 carbs will not work.

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