What brand is KT Japanese carburetor?

Japanese KT carburetor model 5J227JD3, which screw, mixing ratio or oil needle should be adjusted?

Answer your supplementary question: mixing is better than clockwise, but it is thinner. To adjust the oil level, open the carburetor and adjust the "float" in the oil pool.

Turn the screw clockwise to the bottom, and then turn it counterclockwise for 2.5-3 turns. Gently break the float with your hands.