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By any chance are they fat or "chubby" bars? If they are, I will elaborate on a problem I had like yours that was caused by them and the risers in combination and how I corrected it.
Spike- I have WildOnes 16" Chubbys and I am running into this problem. Could you let me know what you did to correct it?
Are the bars not Knurled? What riser are you using? Slick metal on slick metal is bad IMO...Get your dremel out and get creative on the bars then throw some red loctite on em' ffer' good measure!
I'm running the OEM Heritage riser/Knurled Bars with Nary an issue!
check and make sure there is a gap between the clamp top and the risers when the bolts are tightened. if not then you need to file a small amount off the ends of the top clamp where they meet the risers so you can pinch the bars tighter without the top bottoming out before the bars are secure. hope this helps. and of course the bars do need to be knurled or dimpled so it isn't smooth metal against smooth metal.
bars too small, risier ID too big, no knurling on bars or risers.. just shim, file, or grind away whatever it takes to get the mothers tight..without messing up the finish...
An old timer trick that's always worked for me is to get a couple of external star(Lock) washers and put them in between the bar and riser (top and botttom depending on size).
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