Then it appears your dealing with a cable that is too short to reach your current new carby setup...Time to dig out the tape measure and find out how long you actually need and go to your local bicycle shop, or motorcycle repair and have them make you one complete with housing and barrel ends that will fit what your doing.
Remember when i once said that these bikes and kits rarely go together as "plug and play"???...Especially when you start getting away from stock stuff like carby's etc...Welcome to our world...lol.
Every adaptation you make will have it's own unique set of challenges...DAMIEN