What is the function and change of motorcycle throttle adjustment? After adjustment, will the idle speed, mixing ratio and carburetor oil level change accordingly?

Throttle should be throttle (carburetor plunger). Adjusting the idle screw at this position will only affect the idle speed. Adjusting the position of the oil needle in the lower main metering hole will change the oil output of the main metering hole, change the running combustion state and engine performance, and has nothing to do with the mixing specific oil level. The mixing ratio and oil level are still the same. There are specific data in the above positions, so try not to change them to avoid running failure.