Squealing under hard throttle. 2004 XB12R

[C2H5OH]

Hard to describe the sound in words, but when I hit the throttle hard, there's a squealing noise that sounds like it's coming from the drive side. Any ideas?

[user_deleted]

failing drive belt
failing belt tensioner pulley assembly
failing rear wheel bearings
failing front engine isometric mount assembly
loose/cracked/header assembly
loose/ broken front muffler mount assembly.....or worn bushings for same....or broken/missing mount-to-engine case bolt
there's your short list of potential culprits to start checking.

[Theycallmecrash]

Pinging

[Cooter]

Which way do you 'hang'?

Maybe it's your balls.