No they not set perfectly out of the box. I do a lot re-cals as a customer brings in new machine that are stalling right of the box. Since I am not a dealer I charge a small fee for the tuning but most dealers charge the customer too for those that are brought at the big box stores. I even seen metering levers set incorrectly on brand new ones too. Probably why I have the Zama Z , Walbro W, and the latest Walbro W meter lever setting tools.
As the limiters they do serve a purpose other than being a pain for the end users. They prevent customers from leaning out the 2 cycles which when they do they trash the PNCs Stihls and ECho both like to run a little richer than normal but it better for the life of the engine. So that they don't run at max rpms so what, it is better to have long life then run at top and a short life.They also serve a purpose as some trimmers will vibrate out the mixture screws. Yes I have seen where the caps were remove and a mixture screw is lost.
These limiter caps don't bother me as at least I can adjust the carburetor unlike those without any adjustments. The problem is learning how disable log enough to make the adjustments.
