high revving

I'm getting a high vibration and what I think is over-reving when my bike gets to around 2k-3k rpm. It started doing this last year as I was putting it away for the winter. It ran fine before that. I'm still kind of a noob at all this and I'm not sure where to start. Here's a video that shows...

Hey guys, Need some help with my 80 xs. Bike starts and runs. The problem is that once you're in gear, any gear, the engine plateaus and all you get is the engine revving high (me accelerating). For example in first gear she'll accelerate to 10 mph then plateau. At this point I'll drop it...