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Coils, Dyna S diagnosis help needed

  • Thread starter Thread starter MAC10
  • Start date Start date
M

MAC10

Guest
I recently had my bike turn from a 4 cylinder into a 2 cylinder on a road trip. Read the story here, and my quest to fix it. http://www.thegsresources.com/_foru...er-loss-on-a-road-trip-Diagnostic-help-needed

I found cylinders 1 and 4 were not firing, but are getting fuel. I am focusing on the coils and on the DynS as the culprits. The bike will get a new petcock and a carb rebuild out of the situation, For now I need to track down the ignition problem.

I checked the coils with a ( basic) multimeter:
Left coil, which runs cylinders 1 and 4- plug wire to plug wire, caps off 12.2 ohms
between orange/white and white 4.4 ohms

Right coil which runs cylinders 2 and 3- plug wire to plug wire , caps off 12.4 ohms
Between orange/white and black 4.5 ohms

These are within spec from what I have read here.

I installed up my old points plate, to replace the Dyna S to check whether it was at fault. The right hand set of points, which runs 2 and 3, go on when they are open and off when closed as they should. The points plate was running well when I replaced it with the dyna, so it is a known good part. Plug caps are 2 months old.

The left set of points does not turn off. The static timing light I am using stays lit whether or not the points are open.

Does this indicate a short somewhere?
 
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