The throttle of motorcycle hot car returns very slowly.

The slow oil return is mostly caused by improper mixing ratio or slight air leakage in valves and intake pipes. If the cold car is normal, it may not be air leakage. You can focus on checking the air filter and carburetor. Of course, the mixing ratio of the carburetor in the lower cylinder is also adjustable. Generally, it is rotated clockwise to the end, and then it is retracted for about one and a half turns. Concentrate clockwise and withdraw counterclockwise. Of course, if there is a slight air leakage, it will also have a bad influence on the mixture, so you can check the valve clearance and closure first, and whether the intake pipe or other hoses are leaking. When adjusting the mixing ratio, you should start the engine to warm up first, then screw the mixing ratio screw to the end and exit after one and a half turns. On this basis, adjust the idle speed, then fine-tune the mixing ratio screw until the idle speed is the highest, and then adjust the idle speed. You can also repeat the above actions, and it is best to adjust the idle speed. In addition, check whether the shock absorber works normally and whether the carburetor throttle is stuck. In rare cases, when the car is hot, the throttle will become tight and get stuck. Before adjustment, clean the carburetor thoroughly and carefully, and check whether the air filter is blocked or leaks.