Author Topic: Stihl 025 builder  (Read 290 times)

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Offline Cut4fun .

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Re: Stihl 025 builder
« Reply #10 on: April 14, 2015, 12:47:33 pm »
Jim we should split your air filter info or just copy paste or repost it in the 025 thread.  That is some good info to have saved for them.
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Offline 660magnum

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Re: Stihl 025 builder
« Reply #11 on: April 14, 2015, 12:58:38 pm »
Go for it.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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Offline David Young

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Re: Stihl 025 builder
« Reply #12 on: April 15, 2015, 01:47:41 pm »
Kev,
Do you know if it is 42 or 42.5mm? I have been looking for the 42mm.

I will get a check headed your way if you would be so kind as to send me your address.

David

Offline Cut4fun .

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Re: Stihl 025 builder
« Reply #13 on: April 15, 2015, 02:00:27 pm »
No clue. 

Maybe Jim knows somehow to tell without pulling the muffler back off again. He is my local 025 250 guru. He has bought 3 from me. 

@660magnum

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Offline 660magnum

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Re: Stihl 025 builder
« Reply #14 on: April 15, 2015, 03:11:32 pm »
You look down the spark plug hole or in the exhaust port.

two ports equals 42mm

four ports equals 42.5 mm

Or you can measure on a popcycle stick stuck in the exhaust port?

I don't know the detail of any external markings on a 025? But on a MS250 it says Stihl MS250 in between the fins on the cylinder behind the flywheel.

Actually one runs about as good as the other. Either one can be in a 025.
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Offline 660magnum

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Re: Stihl 025 builder
« Reply #15 on: April 15, 2015, 03:57:21 pm »
After having and using both 42mm and 42.5mm bore saws, I think the 42.5mm was more a result of a EPA compromise? The .5mm increase was to make up for the power loss from changing the combustion chamber and porting for EPA emission compliance?

I have a 42mm version and it is a sweetheart. It runs good.
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Offline David Young

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Re: Stihl 025 builder
« Reply #16 on: April 15, 2015, 09:20:27 pm »
Jim
I thought like you did 2 port 42mm 4 port 42.5.

I bought a used oem 2 port. And it proved me wrong.

I have an evil plan for a 42 mm jug. I just need to get my hands on a good one

 ;) ;)

Offline 660magnum

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Re: Stihl 025 builder
« Reply #17 on: April 15, 2015, 09:44:59 pm »
I've only been around and observed four of these saws. I have a 2 port 026 from 1991 and it is 42mm. I have a four port 026 that is from more like the millennium era. It could be probable that there is a intermediate combination?

The saw in the picture a couple posts above may have started out as a 1991 025. I'm essentially the second owner. But observing after having it completely apart - due to wear and tear of use over the years, the only thing 1991 left about it is the crank and cylinder. The covers are from a 025 but not a 1991 025. The rest of the parts are from a 2013 MS250. The crank is unusual in that it has rollers on the big end of the rod rather than a caged needle bearing. The smallest saw of this family had a single counterweight crank with rollers for bearings on the big end in the beginning. Also the rod is a billet style rod. It is not a forged I-beam.

Since the picture was taken I've had to replace the starter cover because the pulley post in the cover was a smaller diameter than current production. It now has a 2013 MS250 starter cover. The new MS250 parts were no more expensive than buying used 026 parts from Ebay.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
Be all that you can be . . .

Offline Jason K

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Re: Stihl 025 builder
« Reply #18 on: April 20, 2015, 05:04:00 pm »
Do you still have it    PM sent

Offline Cut4fun .

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Re: Stihl 025 builder
« Reply #19 on: April 20, 2015, 05:53:22 pm »
Do you still have it    PM sent

It's still here. But right now waiting on payment that is in the snail mail.  Will update at end of week.
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