I cleaned up my LO206 carburetor by putting it in an ultrasonic cleaner with Joy dishwashing soap. When cleaning out the ultrasonic cleaner I had two pieces lying at the bottom: a small gray ball (diameter 0.098" 2.49mm) and a brass tube (L/OD/ID 0.513" 13.03mm / 0.131" 3.33mm / 0.076" 1.92mm) I’m pretty sure the brass tube is for venting and can be glued back into the carb. The ball seems like it is intended to block a drilled passage. I can’t figure out where it goes.
I put a new carb on my kart for race day. I would like a spare carb ready and waiting for use. If all else fails I could run it in practice to see if it works.