Remove the AI and adjust your carbs if your bike is carb style. I don't know where you live so could be FI. Removing the AI and adjusting the carbs will slow the discoloration, almost eliminating it. You can rub that out with several different products like Blueaway or Blue Job just to name 2 but there are others.

I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!