I have not. I did just switch gas tanks to a bonnie tank and had to get it sealed. I wonder if the sealant is causing a problem. I have put about 400 miles on with the new tank and I just started hearing this 2 days ago when I was 2 up riding on some awesome back roads. And btw I just changed my oil so oil is fresh and level is good. I also just tightened my chain as it was pretty loose. See if that helps. Thanks Dog. oh, one more thing! i just just change out the D shaped air/fuel mixture screws for the thumb screws and I did just do that the other day. I'll try adjusting them!

2008 Speedy, AI removed, DIY airbox destruction with K&N filters, spectres, re-jetted and "custom" rattle can paint job.