Doesn't the little Tyrannosaurus motorcycle have a throttle?

Yes The small Tyrannosaurus motorcycle has a throttle valve, and the throttle valve of the motorcycle engine is installed in the cylinder head. Only the four-stroke engine has a valve. Throttle can control the flow of carburetor: control the flow of air into carburetor to adjust the concentration of oil-gas mixture. Usually, it is located at the bottom. The higher the position, the less air enters. When the weather gets cold, the oil and gas concentration decreases. It can be adjusted upwards to change the concentration of oil and gas, which makes the motorcycle easier to start.