This motorcycle doesn't start well in cold weather. What happened? The chimney is still smoking.

When it is cold, the engine temperature is very low, and the inhaled mixture is not well atomized, so it is not suitable for ignition with spark plugs. Moreover, when the temperature is low, the cylinder compression of the engine will become worse, which will also affect the start. At this time, before starting, you can not turn on the key, pull the throttle and step on it a few times (but don't twist the throttle), and then turn on the key to start, which will generally help the cold start. After starting, you can continue to cooperate with the throttle and throttle to preheat at low speed. If the ignition cannot be started for a long time, too much mixed gas will be inhaled. At this time, the exhaust pipe may smoke after starting, which is a relatively normal phenomenon. However, when the car is cold, the gap between the cylinder block and the piston is slightly larger, and the sealing condition of the piston ring is not good. A small amount of engine oil may escape into the combustion chamber, which may also cause smoke. As long as the car does not smoke after heating and the oil is not significantly reduced, it will be fine. If it can't be started for a long time, remove the spark plug and check whether it is wet and black. If so, the cylinder may be flooded. You can burn out the spark plug head or replace the spark plug before starting.