Found a housing and a needle ( #21, 25 ) but not the little parts, washer, o ring or spring ( 22, 23, 24 ). You can get those at any good hardware store or find something online
Did you ever open the carb to make sure the other parts are there? Someone lost the valve so you should check EVERYTHING to make sure you don't need anything else.
You can do everything else on your engine like cleaning the points if it doesn't have spark now, fix the recoil (DO NOT DRILL OUT THE RIVET), etc etc. Fire it up with a squirt of 32:1 mixed fuel to verify it's a running engine. And you can also check the generator when it fires off too. If it doesn't run or generate power, does taking my last valve make sense? Your welcome to it if you need it!