The closest match in detentions the 450 has is the Banshee.

length
450 72.4
Banshee 73.0

Width
450 46.1
Banshee 43.3

height
450 42.9
Banshee 42.5

Seat
450 31.5
Banshee 31.5

Wheel Base
450 50.4
Banshee 50.4

 

A better comparison night be with the 250R

1987 250R..............................YFZ
Total length (m) 1.825 = 71.8....................72.4
Full-width (m) 1.100 = 43.3.....................46.1
Total height (m) 1.070 = 42.1......................41.9
Wheel base (m) 1.270 = 50........................50.4
Roadspace (m) 0.110 = 4.3.......................4.4 ?
Seat high (m) 0.795 = 31.2.....................31.5
Dry weight (kg) 154 = 338.......................350
HP at the Crank =37..........................40??


Just some interesting #s that kind of gives you an idea what their goal was.