Design defect with Rineharts. Chirping drove me nuts. Bub refunded my purchase price. Too bad....liked the deep sound.

 

When you hear it, pull the ctutch in and coast, see if it goes away, might help point you in the right direction.

Sometimes, the rubber mounts get cooked from the heat, gets hard and sounds awful.

Two new mounts cost about four bucks.

 

Muffler mount rubbers? IDS rubber isolators? belt loose??? These are what i would look at....

 

Not a chirp but a definete whrrrr. Cant for the life of me pinpoint it on my GFs 883L. I know its a different bike but does it sound like this? 5 second mark.