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Muffler mounts are usually the prob. Other item to check is the mount clip for bag quick disconnect. Friend had one broke and it emitted a squeek at different rpms. Hard to find. Just lucky and saw bag move.
I found that my noise was coming from the rubber bumper on the rear brake caliper mount squeaking on the swing arm. I tried soooooo many things until I found this by accident when doing a tire change. I dabbed a bit of bearing grease on the rubber bumper, and it went away.
When I was searching for the cause of mine, I found that most here were from the exhaust hangers. They are only $2 or so, try replacing them first.
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