First I have to ask which bike you have?
The headlight on my vstar 650 classic seemed to droop down over the last couple years. I hardly ever ride at night, but this last summer I noticed it was pretty low. I was going to pull the ring off and start adjusting, when I noticed there is a little black rubber like block under the headlight, and it was almost falling off. I pushed it back to where it looked like it was suppose to be, and it tilted the bucket back up about 10 degrees - perfect!
I never got to the bottom of that, I assume its suppose to be there and its suppose to be glued or something. I looked at the parts diagrams for the headlight assembly and did not see that "mount" block in there. I need to put some glue or DoubleSidedStickyTape on mine to keep it in place.
Having said all that, your headlights need to be adjusted while you are sitting on the bike, at least.
If you have a windshield and/or lowers / fork deflectors, then the wind load on the front forks will change with speed.
Bottom line... decide how far off you think your headlights are, adjust them a bit, go for a ride at night, tweak, ride, tweak... till you think it is right.
For me the best indication is when the highbeam lights up the street all the way down the block - when the center of the beam is level down the street, and then the low beam falls where it falls.
On my 650 I can reach up and move the bucket a bit up and down on the shock mounts while I'm riding and see if it looks better or worse, and then adjust it back home.
I don't know if MC shops are suppose to check the alignment of your headlight for inspections - Never came up anywhere that I have lived.
Last edited by KCW; 02-02-2018 at 07:28 PM.