Mine still runs great, I have had it like 7 years, what is the next logical step? I want to go to a pro series for weight and chain speed. I am a stihl guy for sure! I have not even had to put a plug in mine! Can the pro's direct me? Last move was a store saw to the stihl and now I want to raise the bar so to say. I currently run a 20 inch bar and full chisel chain. When using the full bar length in oak it needs a little more power. Thanks in advance...