Flapping noise from rear tire

[Old Dad]

On my 86 Elite 150 I am hearing a flapping noise when the rear tire is moving. I thought it was belt flap, so I changed the belt and still the noise persists. Could this be a bearing out that I am hearing? Even when bike is off and on center stand, if I move the wheel myself, I hear the flap. Any suggestions?

[bakaracer]

Is there marks on the tire that show something it touching or rubbing on it? If there are marks, its either the splash guard for the sparkplug or the drain hose for the carb or the drain hose for the battery

[Old Dad]

No visible marks that I can see. The sound seems to be coming from inside the wheel.

[Wheelman-111]

Greetings:

As you spin the wheel, does it turn true or is it a-wobble? Grab the tire and shake violently left-right, then front-back. Any looseness here would suggest some slop in the axle bearing(s). On the stand, use the engine to spin the tire up to 5-10 MPH and apply the rear brake lightly. If it jiggles, maybe a warped drum hub?

Scan the tire tread itself for delamination - the tread may wander left and right as the wheel spins. Don't ride until you fix that one!

Finally look up under the fender for a nest of birds. That could explain some flapping...