Help identify this drivetrain noise...Please.

[Koko]

Sorry for my numerous posts everyone. But I have no one close by who is into 2 strokes or off road riding in general. Thus, the only way I learn is by asking all of you the pros to help me out.

The video below is a noise my bike is making. The tranny is in neutral. The noise seems to be coming from the rear wheel. It spins easy. But you can "feel" this noise. I just can't tell where it's coming from.

I hoping it's not coming from the tranny and just making the noise sound like it's out back. The chain rollers seem to roll easy and the rear bearings seem nice and tight. Driving the bike it seems perfectly find. No shifting issues, etc.

Or am I just newb and this is normal free wheeling drivetrain noise?

http://fototime.com/90ADC0A8A18DC8D/convx264.mp4