024 Single Ring Piston

[lwn9186]

I have an 024 taken down to clean up and I noticed it has only one ring on the piston. Did Stihl make them this way? The serial number starts with 1 so it should be a German made.

 

[Jacob J.]

There were two styles of single-ring pistons in the early 024s. One was a full-circle piston like the Husky saws of the same era had, and the other was a narrow skirt piston that looks similar to the modern pistons in the 026/MS-260.

 

[ImQuattro]

Sorry to resurrect this old thread.
I'm rebuilding an older 024 (serial #11071460) that has the single ring piston. Surprised me when I saw it had only a single ring. I ordered a replacement two ring piston kit (didnt' see any single ring pistons still available?). I've lurked here for a while now with other projects gleening info and I've read about every 1-2ring thread out there but I'm wondering this:
Install the 2 ring piston with one or both rings?
Any recommendations?

fwiw, my McCulloch 325 has a three ring piston in it, as did the old Sears David Bradley chainsaw I had a while back (iirc).

 

[hotshot]

2 rings, if it was made for it. Work saws do better on 2, but a race saw usually gets higher RPM with one. I never saw much of a difference in compression readings between 1 or 2 either.

Good reading starting at the end of page 10 on ring heat transfer in Terry's article here; http://minds.wisconsin.edu/handle/1793/35285

The .pdf file is too large to post.

 

[ImQuattro]

deep thoughts....
Got the concept & it makes sense... also, this 024 isn't a race saw, so in light of longevity and the logic in that article two rings will be used.
Thanks!

 

[jackjcc]

Bsnelling has put single rings in double rings with no issues. Good logic, not doing anything crazy with the saw, might as well stay stock.