Tune up without proper tools, would require skill mechanic.
Best is to use stock carb and adjust as per the owner manual.
If you disassembly and clean all part, assembly back and cant adjust. Best and easiest is to buy new one.

All my vehicle using carb, I do the peak tune.
1/ Engine at normal operating temp, engine run as normal not bobbing or so.
2/ Turn idle screw to get 2000-2500 rpm
3/ Turn air screw both way, stop where you get highest rpm. While turning if engine to high or low you can adjust #2
4/ Adjust #2 to get rpm within spec