No it doesn't sound normal.

As Jerry Hall would say - "its got the ring dings"

Will it idle if you stop hitting the throttle?

Here is my bike at a idle. The idle should settle down to a nice cadence as that big piston fires off.

Yea it will idle it  was just as you put it I rev it up and it just ring ding back to idle. That was not my video it  sounded  like mine but mine  will idle  nothing leaks on the motor could be between air filter and reeds.  I wonder if its that crapy stock pipe

it idles fine and sounds normal i was running a little crapy sputtering here and there so i checked and cleaned the jets ran it again ran better still a little sputtering at low rpm and top rpms got back into the garage and pipe sounded different there was 4-5 inch crack in the first bend in the exhaust so finally have a better reason to tell the gf  instead it just looks ugly.