Stihl Saw ID

[Vintage Engine Repairs]

Hey guys, came across this saw, the model plate is either AM or the original numbers just worn off. Any idea what it is? 250c is my guess, but a second opinion would be appreciated.

Has a decomp if that helps?

 

[ZeroJunk]

That's what it looks like to me. Nice and clean.

 

[Bob Hedgecutter]

Off the one photo provided- could also be an MS230c- they both had decompression valves.
Either way- must be worth a "how to clean a dirty saw" video.

 

[Vintage Engine Repairs]

Off the one photo provided- could also be an MS230c- they both had decompression valves.
Either way- must be worth a "how to clean a dirty saw" video.

Yeah can’t tell any difference between the 230 and 250. Hmm

 

[Mad Professor]

Yeah can’t tell any difference between the 230 and 250. Hmm

Measure bore?

 

[Vintage Engine Repairs]

Measure bore?

From all the info I can find they’re interchangeable, both bore and stroke. Yet the 250 has a little more power.

Edit:

Some sites say the 230 has 40mm bore while the ms250 has a 42mm bore. Other sites say they both have 42mm bore.

 

[Vintage Engine Repairs]

More digging, I think the 230 is 40mm bore but the engine can be swapped out to accept an ms250’s engine that is a 42.5mm? Edit hence why the full engine kits for sale fit both and have both models listed, while the piston only options state 230 or 250.

Thanks guys. I’ll check the seals, if they need replacing I’ll split the clamshell and measure.

 

[Mad Professor]

More digging, I think the 230 is 40mm bore but the engine can be swapped out to accept an ms250’s engine that is a 42.5mm? Edit hence why the full engine kits for sale fit both and have both models listed, while the piston only options state 230 or 250.

Thanks guys. I’ll check the seals, if they need replacing I’ll split the clamshell and measure.

See if you can find the IPLs. Check P/C assys

 

[Mad Professor]

40.2 and 45.4cc. Source is Stihl Tech Ref Guide 2016. No mention of bore/stroke. 230 discontinued 2012

 

[ZeroJunk]

Maybe ya'll are using a misterm by accident. It's a primer pump. Don't remember seeing any of that series with decomp.

 

[HansFranz]

Looks like it was used to stir roofing tar.

 

[Bob Hedgecutter]

Maybe ya'll are using a misterm by accident. It's a primer pump. Don't remember seeing any of that series with decomp.

Maybe you all want to keep up with the plastic saws you work on- they both have a decomp and a PURGE VALVE.
Decomp on the 230/250 MS's is upper right hand side of the cylinder where the top cover cut out is.

This might help you out.

https://static.stihl.com/api/BaOnli... 20ZBA/0458-208-0121-A_ZBA_20_02.pdf

 

[Vintage Engine Repairs]

Maybe ya'll are using a misterm by accident. It's a primer pump. Don't remember seeing any of that series with decomp.

As Bob mentioned above, it’s a purge bulb. Primer pushes fuel either directly or indirectly into the throat of the carb, a purge removes the air from the carb as in the case of modern 2 strokes.

 

[Vintage Engine Repairs]

Looks like it was used to stir roofing tar.

Yeah it’s pretty bad, though it only cost me $5 so I can’t complain. Hopefully the dirt has kept it looking clean underneath. I’ll clean it and upload a pic.

 

[ZeroJunk]

As Bob mentioned above, it’s a purge bulb. Primer pushes fuel either directly or indirectly into the throat of the carb, a purge removes the air from the carb as in the case of modern 2 strokes.

No, he is talking about a decomp valve on the side of the cylinder which there is apparently a version in some parts of the world.

I have never seen one here and I work on a lot of them. Would solve a lot of problems if we had it here.

 

[Vintage Engine Repairs]

No, he is talking about a decomp valve on the side of the cylinder which there is apparently a version in some parts of the world.

I have never seen one here and I work on a lot of them. Would solve a lot of problems if we had it here.

You missed the sentence where he wrote “purge valve” anyway all good. Just confirming they’re a purge not a primer.

 

[Bob Hedgecutter]

No, he is talking about a decomp valve on the side of the cylinder which there is apparently a version in some parts of the world.

I have never seen one here and I work on a lot of them. Would solve a lot of problems if we had it here.

No, you were the one claiming we were misnaming the decompression valve as a primer- I merely pointed out these saws are available with both a purge valve and decompression valve- the manual on the USA site discusses the models fitted with decompression valves on page 38, in amongst the starting procedures section.

 

[HarleyT]

The real old 025s has a 42mm bore, which changed to the 42.5mm, which might be where the confusion is coming from.
Here is a pic of the cylinder, and decompression valve location. Personally have never worked on one.

 

[atpchas]

From the shop manual:

 

[Phir_1]

what is the serial number?