As the piston approaches top-dead center, the mixture is ignited by the spark plug, and when the fuel vaporizes in the cylinder, the air and fuel mixture is cooled. 由于活塞的辦法頂端死中心，混合物點(diǎn)燃的火花塞，當燃油蒸發(fā)在汽缸內的空氣和燃料混合物冷卻。
The idle system supplies a very rich mixture to start with. 怠速系統提供很濃的可燃混合氣供起動(dòng)使用。
The ignition system provides high-voltage electric parks that ignite, or set fire to, the charges of air-fuel mixture in the engine combustion chambers. 點(diǎn)火裝置產(chǎn)生高壓電火花，從而使發(fā)動(dòng)機燃燒室中的可燃混合氣起燃。
