I have a new 18/52 fastrak. After I engage the pto and then open the throttle to full speed, the throttle seems to move back a little bit. If I hold it there it stays reved up. I was wondering if this is normal or if the throttle needs adjusting? Its really no big deal b/c it cuts fine at the speed it regulates at, but sometimes I could use the extra rpm's. Also I could run a little faster. I guess the only way to find out is put a tach on it and see if it is operating at the proper speed.