Idling up when holding clutch?
 

I have a 1994 CBR 1000F. I've finally gotten it ready for riding and I noticed something the last few times I took it out..

When I am moving, and I pull in the clutch to shift up, the bike revs itself up. I've made sure that I'm not turning the throttle at all. Typically it will rev up by 500-1000 RPM's but there have been times here it will go up by 2000. So from 3 to 3 1/2 or 5k RPM's.

It only does this when I am in gear and moving. Not when I'm at a stop or in neutral. What's going on?