Weird Noise

[EMAGDNIM367]

So last few rides i've went on, i have heard this weird noise and the only think i can think of its from is the wheels or chain and sprocket. Its kinda like a wah-wah-wah-wah sound i can hear the loudest at about 50 MPH. I wish i could explain it better than that. Sorry. Any help would be great. Thanks

P.s. i ride a 91 katana 600

[diavolo]

Wheel bearings?

[katman05]

How old is your chain? is it lubed and clean? my guess would be chain or sprockets.