It maybe something as simple as your carbs have gone out of sync as 1&2 are balanced together and 3&4 then both sides are brought together by an adjuster in the middle, you cant just guess this you will need guages to do this.
Hope that's all this problem is as anything else could be expensive however these engines are fairly bullet proof.
Hope this helps
Testimonial: "thanks ,,was told the same by a mate of mine,although my cbr is injection , but i imagine they also have to be sync,,thanks for the help ."
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