Please revise your title as it is misleading. Theses are not 'pumper carbs'
These carbs have an accelerator pump, and not a diaphragm for each.
To remove the slides, you need to remove the carb top caps and then disassemble the linkage underneath to pull the slide out.
And get a clymer manual, download the shop manual from this site, and use the search function at the top of the page. All of these steps are outlined, typically with pictures...