Do you need to replace the oil drain screw and gasket every maintenance?

You don't have to change it every time. When changing the oil, check the amount of metal foam on the oil drain screw. Just clean it up There is no need to change the throttle. Remember to match it after cleaning, otherwise you know it will be very uncomfortable. The throttle will be cleaned as needed. The vibration force is not weak, and the fuel consumption does not rise but falls. Often washed badly (always disassembled)