Author Topic: Stihl 025 250  (Read 5066 times)

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Offline farmboy

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Re: Stihl 025
« Reply #40 on: June 27, 2014, 05:21:23 pm »
I picked up an 021 looked like it had been under a tree for years.  Did simple MM was impressed that little thing would run.  It had a WT215 on it.  Traded it for some work.  Almost sorry I traded it.
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Offline 660magnum

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Re: Stihl 025
« Reply #41 on: June 27, 2014, 05:26:32 pm »
They are very likable.

+1 on the WT-215 & MM
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Offline Cut4fun .

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Re: Stihl 025
« Reply #42 on: June 29, 2014, 01:23:38 pm »
Well, it has a MS250 case complete with flippy caps on it now. It is not all together for it is waiting on a couple small parts.

So did you go with new or used oem or aftermarket?

Above plus any update?  Did it need sealer at clamshell or not?
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Offline 660magnum

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Re: Stihl 025
« Reply #43 on: June 29, 2014, 03:16:20 pm »
Long story. . .

New OEM MS250 plastic crankcase! Was a take-off where someone bought a new MS250 and sold the parts.

The pan was eaten up as bad as the plastic crankcase so I decided on a new pan, seals, and a tube of Derko for a long term fix.

The spring tip on the worm where it goes in the notch on the clutch bell was worn in two and the worm threads worn right where the pump gear rides on it was real thin. We're only talking about 1/4" of one thread that does all the work. The pump couldn't have been working?

The new worm is made different and doesn't have the washer on the end of it. You have to buy a separate metal washer to cover the clutch mechanism.

Later 025's and all MS250's have the brake mechanism made different and there's a spring holding pin missing from the later cases inside the chamber that holds the chain brake mechanicals. You have to buy a leaf spring as a replacement that serves to hold the brake handle flag up when the brake is off.

This saw was run with a rusted out muffler and burned up the top cover. The 025 has a replacement top cover - still older but newer than the original one that would have had a riveted on metal "025" name plate. The current top cover has a plastic name plane that just snaps on.

There is a bur inside the right hand muffler retaining nut that keeps the nut from going more than fully on the muffler retaining screw. It will not tighten against the muffler. This caused the muffler gasket to burn up on that side. As a result, the heat shield is all distorted. I'll need a new flanged 5m X .8 nut for that side. As a result of the muffler being loose, the exhaust flange on the cylinder was all pocked up. I dressed it with a 12" flat draw file and it looks pretty good now.

The lower right AV buffer was split but the new crankcase had a new buffer in it.

On the replacement top cover, the front buffer in the original 025 donor saw was either busted or missing and the top cover rubbed on the top buffer holding ring of the original crankcase. This wear point is all intermingled with pine rosin.

The muffler is a right new MS250 muffler that has now been muffler modded.

The new crankcase came with a new fuel line and filter as well as the flippy caps.

I made up a new tank vent with some Tygon from Glenn's and the original grub screws from the original vent. I tested the new vent with the Mity Vac and the vent functions like the workshop manual says it should.

All that from a 025 that looked right nice when it came into the shop?

Anyway, it will look nice once again when I get all the parts here and get the saw together.

It will  look like my other Stihl's of this family.
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Offline 660magnum

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Re: Stihl 025
« Reply #44 on: June 29, 2014, 03:32:13 pm »
I measured the bore on this early 025 and it was 42mm as expected.

I measured the bore on my other (later) 025 and it was 42.5mm just like a MS250.
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Offline H 2 H

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Re: Stihl 025
« Reply #45 on: June 29, 2014, 10:30:09 pm »
I measured the bore on this early 025 and it was 42mm as expected.

I measured the bore on my other (later) 025 and it was 42.5mm just like a MS250.


I believe the MS 250 are 45 cc

http://www.stihlusa.com/products/chain-saws/homeowner-saws/ms250/
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Offline 660magnum

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Re: Stihl 025
« Reply #46 on: June 30, 2014, 01:49:06 am »
Yes, the last of the 025's and the MS250's are 45.4cc and have a 42.5mm bore & 32mm stroke

The early 025's had a 42mm bore and the 32mm stroke gave them 44.3cc
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Offline Cut4fun .

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Re: Stihl 025
« Reply #47 on: June 30, 2014, 09:11:59 am »
He never said anything about ever replacing the top cover. But who knows what all happened from 1991 to 2011. 

Only person I know that used to buy the new MS250 - MS290 and part them out was Fish.

I ran into that updated stuff not working ( clutch side too) on a early 034 compared to later 034. Stuff I was buying for 034 wasnt fitting on the early 034. Finally I think it was Cale bloodontheice pointed out I had a early 034.
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Offline 660magnum

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Re: Stihl 025
« Reply #48 on: June 30, 2014, 10:34:36 am »
It'll be fine once the parts get here.

There's at least a half dozen guys in addition to Fish that buy new Stihl stuff and part it out on Ebay.

I had a choice of two different guys to get the new tank assembly from.
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Offline 660magnum

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Re: Stihl 025
« Reply #49 on: June 30, 2014, 09:30:51 pm »
Well, today was going to be the day that the parts came in.

They did . . .

But Stihl back-ordered the engine pan. They leave you hanging, It's back ordered (infinity?) No one knows until when?

So I ordered a used one off Ebay.

I worked on what I had, on finishing the brake mechanism. I installed the leaf spring I ordered and assembled all the brake parts and installed the brake over-center mechanism cover.

Then I moved to the other side and the starter side of the brake lever. The original fastening bushings were gone with something out of a junk box in their place that obviously wasn't correct. Well, the new correct bushing didn't fit even as good. I compared the lever with my other 025 and MS250 and the lever is different in that area.

So I ordered a nice used current style lever from Ebay. Can not wait a couple days on Stihl to find out it is on back order and then have to source one from Ebay anyway..

When the used lever comes in, I get to take all the brake mechanicals apart again, big spring and all, to put in the new style lever.

This is a old 1991 saw. Though it didn't see a tremendous amount of use as a homeowner firewood chainsaw, It has been apart a few times for various reasons.

I fitted all the oil pump drive and clutch parts as a trial fit. This design as been changed over the years and it now has all MS250 parts in that area and they all fit up correctly. The brake band grabs the clutch and releases so the clutch is free as a bird. I get to take all this apart again when the engine pan and seals come in.

The nuts for holding the muffler down did not match. The bolts did but the nuts did not. I bought new proper 5mm flange nuts from the bolt bins at the hardware store.

The nuts that hold the carburetor do not match either. No doubt there's been some fuel lines put in it and I know the top cover is not original. Someone even put a new pull cord in the starter. It was done proper.

If I was fixing this saw for someone, I would go broke trying to make everything correct. A lot of the deferred items would have to be put back like the 025 came in and not clean anything? Now it is all clean . . . its mine. What's there looks very nice.

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