we must be brothers from another mother..I just picked up a 96 Helix, we have our S200's but you have me in cc's with your KZ400 vs my Ninja 300!
I have written down 35 for pilot and 116 for main. I checked service manual and it lists 35 and 118.
attached pic of my main jet...sure looks like 116 to me, although there's no guarantee it is original to my scoot. Also attached page from service manual listing jet sizes.