QuestionJohn, I have just sent you a question about the carburettor diaphragm for an old MonoLine chainsaw. I have further numbers for you: On the flywheel I can see "Made by R E Phelon Co for Power Products Corp, Model 2120-VA". Hope this helps you identify it. Rick
Answer
Tecumseh carb
Back then a lot of things were made by Tecumseh Lauson, boat motors,
chainsaws, etc. For a lot of good old chainsaw info go to Mike Acres
chainsaw corner, has a lot of pics and info, look at the Tecumseh
Power Products section, you will likely find your saw. some info is scarce, some models are quite detailed. He might be interested in
a pic of yours, if he doesn't have a good one. It is at www.acresinternet.com, or just google "Mike Acres Chainsaw".
Here is a pic of an aftermarket carb kit, see if the diaphragm looks like yours.
