First check for play in the throttle shafts. A (very) minor amount of play is ok. Anything more and the carb is toast. Yes it is possible to fit bushes, new shafts and butterflies but that usually runs more than a replacement carb.
Play is ok? Remove the top plate. The choke plate is linked to the throttle and be released either by removing a pin, or by unhooking a bit of linkage. LOOK carefully and get it right. It’s a simple connection but how it comes apart is not always obvious.
Now look at your float. Brass? Excellent. Black composite? Not so much. Ethanol may attack this kind of float. Next remove the three screws holding the vacuum operated power valve. Look very carefully at the power valve diaphragm.
Now put the carb back together correctly. It will take a while for parts to come and it’s best to not to leave it disassembled while you wait — at least if your memory is anything like mine, sigh.
At a minimum, you need a major overhaul kit which will include: all the gaskets, pump diaphragm, and needle and seat. Add a power valve and/or float based on what you found.
