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It is late Sunday but I think you are right about that. I will dig into that next.
Dude, it just make sense that if the bike was running well before you removed the motor and is running poorly now, that the engine removal caused the problem. And since the problem seems to be that one coil is not getting a signal, that the wiring from the pulse generators is suspect.
It could have gotten pulled, or pinched, or the plug left of the coils could be failing, but I'll betcha a donut it's something in those PG wires.
I don't want to blow a hole in your banana boat, but, I think you guys are confused as to how the PG's work, and why they can't be the problem.
The PG's send a signal to the control unit. The control pulses a ground to fire the coils. If it were just the coils being controlled, you might be on the right track. But, unfortunately, the control unit pulses ground for the fuel pump relay as well as the LCD on the Aspy's on the same circuit as the left coil.
If the fuel pump runs, and the LCD works correctly, the problem is neither the PG's nor the control unit.
 

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You keep wanting to blame it on the ignition. A coil isn't going to fire poorly at idle, unless the coil fires poorly. Period.
I'm relatively certain you have a carb problem.
First check and make sure you didn't leave the vacuum hose disconnected on the #4 intake runner. I've done it. Pinch it with a pair of pliers, to verify no leaks.
If that doesn't help, remove the sync screw in the intake runner and give it a shot of carb cleaner. If the rpm's increase, you're too lean.
I know you "cleaned" the carbs, but you've probably inverted the rack two or three times before they were cleaned and reinstalled. You could dirt floating around anywhere.
LiquidCrystalDisplay on the aspy's. (LCD)
 

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Intake tubes, intake pipes. The semi polished elbow between the carb body and the head. Clamp at one end. Two acorn bolts at the other.
Each tube has a screw at the base for installing the synchronizer tubes.
Remove the screw and shoot some carb cleaner while idling.
 
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