Chainsaw Repair

I looked at my Stihls. First of all, they are so old and having been mixed and matched, it would be hard to say?

Of this picture of 025's / MS 250. The oldest of the 025's has a red choke lever and the small 2 port cylinder. It was a 1991 model but after having worked on it. The parts are mixtures of all years of 025's and MS250's even though it was a one owner. It's a sweet heart to use.

025's http://chainsawrepair.createaforum.com/index.php?action=dlattach;topic=274.0;attach=7246;image

And I have this 026 and you say it has a "D" shaped combustion chamber but it has a black choke lever. I don't consider this saw to be a valid example as it is a old one with mixed and matched parts. Excellent saw though.