Motorcycle is newly equipped with carburetor, how to adjust the valve?

Generally, it is not necessary to adjust the valve when replacing the carburetor of motorcycle (the valve here refers to the valve of the four-stroke cylinder head).

If by "valve" you mean the throttle of the carburetor itself, it's easy. Just adjust the idle screw of the carburetor after the engine starts (adjusting this screw can keep the throttle in a relatively stable open state).

The standard value of adjusting speed is 1500 rpm. If you have no experience in this field, you only need to adjust the engine speed to the lowest speed that can maintain its normal continuous operation.