Where are the motorcycle valves and spark plugs in the engine?

Air valve (also called throttle valve), in the position of engine carburetor, some models have a lever that pulls up and down, and some models swing left and right. It is generally used when cold cars are started in winter to adjust the mixing ratio of gasoline and air. The adjusting handle is on the left handle, and there is an N ... spark plug on the handle. There is a thick black wired plastic cap in the middle of the right outside the cylinder, which is a spark plug cap. It is easy to take it off and you can see the spark plug. ...........