In order to adjust the carburetor it is necessary to warm the motor up first. The motor should have at least 5 minutes running time before any adjustments are made. On the left side of the carburetor near the front is the idle mixture screw. On the HuaSheng motor the idle mixture screw is a fuel adjustment, not an air … Continue reading Adjusting the HuaSheng 142F (49cc) carburetor