What if Yamaha motorcycles can't be idle?

First, prepare. Start the engine for preheating and fully open the choke valve; \x0d\ 2。 Pre-adjustment. Adjust the throttle screw to ensure that the engine can run at a certain speed without stalling when the throttle knob is completely loosened. \x0d\ Three, one high. Adjust the air conditioning screw to increase the engine speed as much as possible; \x0d\ Four, one low. Adjust the throttle screw to reduce the engine speed as much as possible. As long as the adjusted engine runs smoothly, starts smoothly, accelerates smoothly and has normal fuel consumption.