Number 1, 1991 Ducati 907ie
#2 was an RD 350 track bike made out of three bikes (so does that make it 2, 3, &4?). It's #907, I haven't got any good pics of it
#4 was a Honda Hawk... if I have pics I don't know where they are
#5 May have been a KDX250, not sure of the exact order around this...