Who knows what someone was thinking when they put the big spring on the pedal. The spring attached to the brake light switch is actually more then enough to return the pedal but I did use a small spring to keep the pedal from bouncing on a rough road and trigering the brake light. I feel like the big spring takes all the feel out of the pedal and dampens out any feedback. I use my back brake a lot so I like to a better feel for what it is doing, also why I lubed it to make it smoother, not a lot but sure didn't hurt any.
2013 ZX-14R with lots of mods, quick and comfortable.