I think the illustration is a certain year of a CB400T but there are no others in the manual.
The manual shows tapered side down. Doesn't look tapered like the picture but if I look close the last coil is actually a little bit smaller so I guess it should be down. That means tight side up.
My springs was put in the other way with the tight side down and that's how most people on other Hondas has their spring from what I've seen but it doesn't mean it's correct on my model.