So I have an 06 cbr 600 f4i with 22k miles. I can shift through all the gears and downshift through all of them good. While I am riding and going through the gears the shift lever starts to move up and down consistently with a ticking sound and every now and then while I am riding the bike will act like I had pulled in the clutch and go down to idle rpm and the shifter aggressively moves up and down and won't allow me to shift. I'll put a video with the shifter moving while riding but I'm not sure if I'll be able to capture the bike going to idle rpm and not letting me shift.

 

What sort of quickshift does it have fitted - I'm not aware that one came as standard and it sounds like a quickshift problem rather than transmission.

 

There is no quickshifter on it.

 

Then what can be dropping the revs when it feels like the clutch has been pulled?

Pull the clutch without adjusting the throttle then you're bouncing off the rev limiter and no form of transmission problem will affect the throttle.