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Hi Bob! Sorry I haven't been in touch. I was sidetracked by trying to get two BMW F650GS motorcycles back in running order. And that is still a work in progress...sadly! Hence, the chainsaw has taken back-bench. Since the cylinder is in parlous condition with regard to being able to mount the...

You are spot-on. Compression on the 031 was also 30 psi.

Bob, I appreciate your advice. I'm learning, and that's fun, as well as practical! I'm using a nice automotive comp tester. I'll check my 031AV with it for comparison. If there is carbon scuffing, what should be done? Replace piston? Rings? Both? What is the advantage of keeping the old cylinder...

Compression 30 psi What I can see of the piston looks fine. I can't see the cylinder wall at all. Is there an exploded view diagram of the saw anywhere that you know of? And yes, that is a busted muffler stud! Perhaps another reason to replace the cylinder. I doubt I can get that thing out with...

Good idea. My resources are quite limited, though. I live and run an NGO in West Africa (Senegal & The Gambia). I could do a compression test but vacuum (leak-down?) is not possible without a 3-day journey. I'll check and try to photograph the piston. I have to pull the cylinder anyway, no? Even...

Good eye, Bob. I haven't taken anything apart yet.

Bob, I noticed you're a Kiwi. That made me smile. I've been doing a lot of work on a BMW motorcycle and two guys have been advising me. One's from Oz. The other is from Dunedin, NZ.

Thanks for the reply. Yes, it's a complete saw I've had since about 1975. It completely lost compression. The kit I have is for a top-end rebuild: cylinder, piston, piston ring, surclips, and it looks like a carb rebuild kit is included. I can take some better photos, if needed.

I have a rebuild kit for my Stihl O28WB. Is there a video or other tutorial on the procedure? Or is there someone out there willing to chat with me about the procedure? I have decent mechanical skills and good tools. I'd like some guidance before I dive in. Thanks in advance.