What process did you use to clean carbs?
Do compression-test and post results here.
Also manually check and look at spark:
1. unplug spark-wire
2. insert spare spark-plug into plug-wire
3. ground case of spark to engine
4. crank
Is spark blue & bright? Or dim and yellow?
Just because cylinder isn't running right, doesn't mean it's only spark being problem. It could be valves, rings and sealing. It could be fuel as we haven't measured actual AFR in exhaust of that cylinder to confirm it's good or not. And if it's really spark, could be various causes such as plugs, plug-wires, coil, power & trigger wires between igniter and coil, or the igniter itself or crank triggers and their wires.
So LOTs of possible causes. Don't narrow yourself down to just one possible culprit when there's 16 others to test.
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