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Are you sure the throttle cables are attached ? Are you sure the butterfly is opening when you twist the throttle ? One of two things should happen when you open the throttle. One the engine will Rev or at least attempt to, Two the engine will die. As neither is happening, that implies that the slides are NOT rising. Please check that the slides are fitted the correct way round, that means the hole in the bottom by the needle is towards the engine side they can be fitted back to front !
Next check the the slides do work, no tears in the diaphragms & no leaks around the carb tops. I use a hoover to prove this. Take the carbs off, use something to hold the butterfly in the open position. Then hold a running hoover or vacuum cleaner nozzle to the engine side of the carb, you should be able to watch the slides rise. Also ensure the needles are properly fitted to the slides.
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