Hi and thank you for your question.
In an honest effort to help you get your bike fixed as quickly as possible, I respectfully ***** ***** you have an ignition problem and here is why. Cylinders 2 and 3 are on the exact same circuit and any problem that you have on cyl 3 would be duplicated on cylinder 2. If they are not doing the exact same thing, you don't have an ignition issue.
Think about the ignition system as a whole. You have 4 cylinders, but only 2 coils. That means cyls 1&4 always fire at the same time, and cyls 2&3 fire together 180 degrees later. Motorcycle ignition systems do not use a distributor type system where only one cylinder fires at a time.
The only components unique to each cylinder is the high tension spark plug lead and the spark plug cap. It is easy to test this theory, simply revers the #2 and #3 spark plug leads and caps and see what happens. It will not change the way the bike runs if everything is fine. If there is a problem in the wire or cap, the problem will follow the wire and cap.
Since you know it is fouling, the best thing you can do is a compression test. I suggest testing all 4 cylinders and paying particular attention to cyl 3. After you do the compression test, do a leak down test on cyl #3 also. Listen for escaping air. I suspect you are losing compression past the rings.
Go ahead and test that and let me know what you get.