[Durbud]

2007 T-100 19k miles and I'm hearing a steady mechanical sound in 5th gear under a steady load. I can barely hear it in 4th it's most noticable at around 2.5 to 3k rpm 40 to 50 mph. If I pull in the clutch
in it go's away. I just noticed this recently. Any idea's? The bike is stock.