I had an 81 YZ465 in the late 80's. It was around 88. Man it was a bear to kick over. It ran like a scalded dog, way faster than I was. But man was it fun. We ran 1/2" zips into the knobs for ice traction. It spit them out like bad chiclets! I wish I still had it.
1989 ZX10 with an 03 ZZR1200 motor, 41mm FCR's, a 4-1 Micron pipe with comfy Concours bars and a Corbin saddle.