Where is the throttling in April?

April, the throttle is at the back of the engine. Throttle is a specific function of motorcycle engine throttle, which controls the flow rate of carburetor: it controls the air flow rate entering carburetor to adjust the mixture concentration of oil and gas. Usually located at the bottom, the higher the position, the less air enters. When the weather gets cold, the concentration of oil and gas will decrease. The oil and gas concentration can be adjusted to make the motorcycle easier to start.