Ask for video: What is the unstable idling speed of tricycle?

There are the following possibilities (or solutions): 1, clean the throttle and match the computer; 2. Check the spark plug and replace it if necessary (by the way, look at the high voltage line); 3. The valve has formed carbon deposit and should be removed (consider "bottle hanging"); 4. The vacuum tube leaks-if it is damaged, please reconnect and replace it.