Lots of factors that could cause this newly felt vibration I would guess, but....

Make sure the rear sprocket maching is "centered" on its mount holes with no "up/down" as it spins. I've seen a couple "not round" sprockets over the years.

Next and most likely, make sure there aren't tight spots in the chain from an over pressed master.

 

If the master link is over pressed, can I loosen it?

Enviado de meu ALE-UL00 usando Tapatalk

 

hows your chain slack and alignment? also did you check your new sprocket for warp/throw out?

 

Slack is file, I'll check the align tonight. What is warp/throw out?

Enviado de meu ALE-UL00 usando Tapatalk

 

So, I washed the bike and cleaned the chain with kerosene.
The master link seems to be a little bit stiffer than the others (as it is a brand new chain), but not stuck; it is better now.
The rear sprocket is centered and flat (per eye check) and aligned, I have an alignment tool and checked it.
I will lube the chain tomorrow and take her for a ride, if the problem still persists I'll take it back to the shop where I had the chain and sprockets replaced and tell them to deal with it.

Thanks!