Approximatly two weeks ago I did the 25000 mike service on my bike, a 2015 Street Glide. A day or two after I did the service I noticed a vibration in the foot pegs on the crash bar. This vibration seems to have gotten worse since then. The vibration isn’t terrible but like I said it seems to be getting worse. The only things I did differently on the last service is I changed to Belray primary fluid and I replaced the spark plugs with NGK Iridium plugs.
I noticed today the bike doesn’t seem to be idling normally. It seems to be running a little rough. Admittiedly this could be in my mind because anytime something doesn’t seem right on my bike I become hyper sensitive about EVERYTHING on the bike. But the vibration is real.
I have checked everything I can think of. I can’t find anything engine related touching to frame in a unusual place. Head pipe isn’t touching anywhere, mufflers are positioned correctly, I can’t find a rock or anything stuck between the frame and the engine. Tire pressure in good and the tires are in good shape. I can’t find anything loose on the bike anywhere.

So I ask, what am I missing? Could changing the primary fluid some how be causing this vibration? Could the different spark plugs be causing the engine to run “different” and cause this vibration?

Any constructive input put will be appreciated.
TIA,
Kevin

You don’t mention if the vibration is only when you're moving, but last month I had a new vibration coming through my front floorboards. I checked everything I could think of: loose fasteners all over, motor mounts, the front wheel bearings had already been replaced, etc. Finally at my wits end I pulled the brake caliber off the rear wheel and found a very slight bit of play pulling the wheel side to side. Pulled the wheel and found a bad bearing. I replaced it and the vibration is gone.

Maybe a balancing weight fell off... did it get washed?