4、 When disassembling the flange ball valve, the bolts and nuts on the flange shall be fixed first, then all nuts shall be slightly tightened, and finally fixed with force. If individual nuts are forced to be fixed first, and then other nuts are fixed, the gasket surface will be damaged or broken due to uneven pressure between the flange faces, resulting in leakage of media from the valve flange butt joint.

Why prevent or restrict air from entering the carburetor? At this time, it helps the motorcycle to start smoothly under cold and low temperature conditions. If there is no damper, the carburetor will enter a large amount of cold air when starting in winter, and the car is not easy to start. If the damper is closed, there will be a little air in the carburetor. When starting, the spark plug ignites and the air shrinks and warms up, the car will be easy to start. After a successful ignition, the car should quickly open the damper, Otherwise, air cannot enter the carburetor, and the carburetor will be "stuffy" and shut down.