1997 Yamaha GP1200 Waverunner Vibrations?

I have a 1997 Yamaha GP1200 Waverunner. It runs fine but it vibrates a lot. It also has a rought idle speed. I am just wondering of this is normal or if there are some adjustments I can make to make it smoother. I have a 1996 Yamaha Blaster 2 760 that runs just fine on has a nice smooth idle speed.