Issue with 04 YZ450F

Hi guys. I'm going to try my best to describe my bike problem. While riding the bike, about 1/4 to mid throttle, the bike starts to feel like its reving more than its actually putting out. It wasn't happening at the beginning of the ride, but by the end was obvious the bike wasn't running properly. Could it be the clutch plates slipping? It's my only guess at this point. Clutch doesn't seem to have problems when its engaged. Problem only seems to exist when twisting throttle.

BTW, I've had my bike since 05, and put tons of hard hours on it, and never had to do anything to the motor other than adjust the valves (twice since I've owned it) and adjust the carb. Any help would be appreciated. I don't want to fork out the coin for a new clutch kit if I don't need to.

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