My bike's better than me!
Joined: Feb 2005
Posts: 2,267
Likes: 395
From: Northern Colorado
Bikes: Moots Vamoots, 'Dale T2000, DB Response Comp, '98 G. Fisher HKEK, '89 Panasonic DX-6000, '88 Fisher Montare XT, '83 Nishiki Int'l, '72 MB GR, '75 MB GJ, '77 MB LC, '85 Centurion Ironman, '82 Miyata 710
My '83 Nishiki International did that. I took the headset apart, got rid of the caged bearings, cleaned everything up, put in 'the right number' of Grade 25 loose-balls, added good quality fresh grease, and reassembled.
Fixed it. Not just 'improved:' fixed.
Why? I'm really not sure. My approach was a hunch after verifying my frameset was intact/straight/aligned.
Good luck!