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My left side ball joints went south at about 40,000. I didnt hear any noise though. At about 55,000 I had a terrible thud going on in the front. Replaced the sway bar to frame bushings. She rides good as new now.
Could also be body mounts...peel back carpet and check that one. It is cheapest.
I have about 40k on mine and still need to do this. I am waiting for warmer weather like may. I have similar noise but still getting good mpgs so not too worried. Ball joints do not cost more when you wait 3 months. I may need them now, but not looking to fix until bike is a daily driver.