and you would say what to my stihl dealer who told me once to not baby the equipment run it at full throttle??? the first stihl trimmer i had started running funny after maybe 3 or 4 months. i took it in and the dealer to me it had carbon build up on the exhaust screen. i wasn't running it at full throttle nearly enough. told me to run it at full throttle all the time except when around vehicles and things of that nature. so what do i do? i run that baby at full throttle all the time. unless i'm by a vehicle or in an area that the trimmer is highly likely to pick up something and cause damage.