I only remember this happening two or three times. One was FANTASTIC FOUR# 13 (with the Red Ghost), another was maybe a Spider-Man back-up story. It's a neat effect.
As far as I recall, though, Kirby seldom inked his own work. It was time he (and Lee) thought could be better used pencilling a new story. All the original Kirby pencil pages I've seen have had much more personality than the published art; even the best inkers tend to put in some of their own approach.