The link below will take you to a short video I made of my Sportsman 400. Notice the noise at the end of the rev, sort of like a chattering noise. Can't tell if something is loose, a hole in the exhaust, fluid issue, etc.

Will take any ideas!

https://goo.gl/photos/U76Phxv4j8sCpKA2A

 

Not seeing any link..

 

Can see the video now. Sounds to me like the noise is radiation from the drive clutch area. Worn spider buttons can make these thing sound like a diesel when the spider hits the clutch sheath towers.