Stihl 025 should max at 12,500 RPM, but turns 13,500 to 14,000 RPM. I have replaced the seals and pressure tested, rebuilt the carb and the saw runs great both in and out of the cut. Fuel lines have been pressure tested and are good. It has only a low speed jet adjustment and I have richened that as must as I can and still get good idle and decent throttle response. Should I just run the saw and keep an eye on the spark plug color? Any suggestions other than buy a carb with two adjustable jets?