I see nobody responded to this... did you find an answer?
Mine is shaking pretty bad too, even audibly at certain speeds. However, the bike was dropped once and I still can't figure out how, but it must have affected the headlight because its entirely out of whack. Not sure whether to buy a new one, keep troubleshooting, or go aftermarket.
I'm starting to think the vibration is normal. My son has an '07 classic, it vibrates, a friend has an '06 classic, it vibrates, and another friend has an '08 custom and it vibrates as well We've gone through the mounting system on all 3 and can't find anything loose.
'02 Vulcan 1500 Drifter
'07 Vulcan 900 Classic
'06 HD XL1200C
'76 HD XLH
Patriot Guard Rider
SCRC, Rolling Hills Chapter 314
I quite often ride at night, and my driveway is 8/10s of a mile long on gravel, and I dont have any shake in my headlamp. If you can't find anything wrong, check the shock adjustment to see if it is cranked up to tight. If there isn't some give somewhere, it will show up as a harsh ride in your headlamp beam.
With Steel Horse on this one. I'm running an 06 Classis LT and also do a fair bit of night running and my headlight is rock steady. No idea where to look as far as tightening anything up but definitely a weird one as there even seems to be mixed replies on the vibration