What's the use of chain saw throttle and throttle?

The function of the damper is to limit the air flow, improve the fuel concentration of the mixture and make it easy to start. However, if the throttle is too small, the engine torque will be limited and the fuel economy will be poor. After the engine is started, the air door will be fully opened when the engine temperature rises, which can increase the air intake and torque, and the engine speed can be adjusted only by the throttle.