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Premium Member
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3 on the right look perfect,one on the left looks fouled. Could be any of several reasons
 

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Hand-Eye Coordinator
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The one on the left is an unclean burn. Probably too much fuel, not enough air, intermittent spark, or weak spark.

If you change them out and the bike goes back to normal, that's great. If it still runs poopy, explain how it runs poopy.
 

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Cheap way to test this, move that plug to a different cylinder, You could move the coil as well but you wont know if its the coil or plug causing the issue then go ride the bike thru a good heat cycle.
If the fouled plug follows the move to the other cylinder you have your answer, has to be the plug or coil. If not then you may have a leaking injector ( primary or secondary ) worst case is weak compression on that cylinder.
 
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