Is there any kind of law governing how much noise a moped is allowed to make?

I ask because the only vehicles I can hear three streets away are mopeds. There is a bus route in the very next street but I hardly ever hear them.

Even worse is when you get a few members of the same "hoody" gang racing around on mopeds in the evening.

I can't see how something with such a small engine can be allowed to be driven around making such an awful noise.

I'm sure if the silencer on my car exhaust fell off, I'd eventually either get stopped by the police or get complaints from the neighbours about the noise.

-Madison Lathe, Brighton