Let me preface this by saying I HATE STIHL !!! The new carbs for the br600 are no longer adjustable with a screwdriver, you cannot buy the new adjusting tool from a dealer because stihl doesn't allow it. Does anyone know where I can get one or what they have used to make it work? Why do i need to adjust the carb? A new carb on a 3 year old Br 600 gives me 6700 rpm. If that doesn't make sense to you then don't comment. if you have any legit ideas please let me know. If you love Stihl, good for you, unless you have the answer to my question, don't comment. Alsoif anyone has a parts breakdown for the 90, and 110 engines let me know. i may even be willing to pay for it.