I made the big mistake of trying to adjust the throttle to get more rpm. The mower seemed to be running slower. I loosened the bolt that tightens the throttle arm on the pin that comes out of the motor. My guess is this pin is designed to increase the throttle under load conditions. It must be VERY sensitive to adjustment because now I have too much throttle and not enough throttle kick up under load. Is there a procedure for setting this throttle to get the proper balance of fast idle and proper throttle increase as you engage the blade and work the motor?