Just bought a Stihl FS 90R two days ago done lawns both days since then. I noticed that when I'm at full throttle it bounces like its at the rev limit (which it is) my question is: Is this alright to run at full throttle for full periods of time? when I use the throttle lock it sits a little below max power. The rep I bought it from said he used the lock but he said that he should probably run it at full throttle. So is it easier on the machine (make it last longer) to run at full throttle or half way. Also I was reading the Stihl catalog and the next model up the FS 110R had "lower vibrations for improved life". Is this what it was talking about. Thanks for you help guys!