I just got this saw and hosed off a layer of dirt and saw Partner S5 something. This old boy was making firewood before partner shook hands with pioneer. I am not to familiar with this saw but someone out there is an expert on it. If I can get an ID then put it in the f/s section and make someone happy. There are bound to be some of you out there that just needs a cover, starter or something off this baby. It all seems to be there. Runs with a squirt of juice down the throat so should be an easy to fix runner. Has a 20 inch bar