I had this issue as well. For me it was more of a clunky noise. I had some old rubber tubing lying around, just about the right size. Just stuck it in there to replace the old rubber bushings. Works like a charm.I found and fixed mine. Might be worth looking at. My front gas tank bolts/washers vibrate on the tank tabs, I could press or pull on the tank while riding and it would go away. I added a big washer under it to keep it tight and it's gone! Now I can hear the other side starting to do it, one more washer and I should have it!!