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Author Topic: Stihl Piston/Cylinder Kits  (Read 3737 times)

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Offline SawTroll

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Re: Stihl Piston/Cylinder Kits
« Reply #20 on: December 30, 2012, 06:01:44 pm »
Quote from: Cut4fun_ on December 28, 2012, 08:12:27 pm
The 026 pro I tore down was 44mm. 

I'd be pulling topend  and micing to make sure.

All 026 saws were 44mm, regardless of version. The 44.7mm thingy was done to the US made 260s (not to the first ones I believe, but in 2004 or so), to bring the cc number over 50 (for EPA reasons - different rules over and under 50cc). At the same time, the power rating went down from 2.6 to 2.4 kW.
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Offline Cut4fun

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Re: Stihl Piston/Cylinder Kits
« Reply #21 on: December 30, 2012, 06:30:39 pm »
I'd always measure though. You never know if someone put a 44.7mm on a 026 on a rebuild. I know I would have if I hadnt found a trade on a woods ported 44mm topend that was like new.
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Offline Al Smith

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Re: Stihl Piston/Cylinder Kits
« Reply #22 on: December 31, 2012, 04:52:28 pm »
If that plug is a brownish color that pretty much indicates the saw was tuned about correctly .Whitish would be lean and black too rich .

If it didn't pull a bunch of aluminum off the piston I'd just clean it and the cylinder up with Scotch -Brite and kerosine and stick another set of rings in it .Although a set of rings can last a long time they do wear out after a time .
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Offline davbell22602

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Re: Stihl Piston/Cylinder Kits
« Reply #23 on: December 31, 2012, 06:00:45 pm »
Quote from: Al Smith on December 31, 2012, 04:52:28 pm
If that plug is a brownish color that pretty much indicates the saw was tuned about correctly .Whitish would be lean and black too rich .

If it didn't pull a bunch of aluminum off the piston I'd just clean it and the cylinder up with Scotch -Brite and kerosine and stick another set of rings in it .Although a set of rings can last a long time they do wear out after a time .

Some of the scoring marks were deep enough to see where the brown marks covered it where it scored the piston.
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Offline Cut4fun .

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Re: Stihl Piston/Cylinder Kits
« Reply #24 on: December 31, 2012, 06:20:06 pm »
Pics of piston exhaust and intake side along with cylinder same way?
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Offline davbell22602

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Re: Stihl Piston/Cylinder Kits
« Reply #25 on: January 04, 2013, 01:20:25 pm »
Quote from: Cut4fun_ on December 31, 2012, 06:20:06 pm
Pics of piston exhaust and intake side along with cylinder same way?

I'll get the pics. Also other difference between the 026 and ms260 is that the ms260 has compression release valve on the cylinder from what I was told.
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Offline 660magnum

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Re: Stihl Piston/Cylinder Kits
« Reply #26 on: January 04, 2013, 01:27:43 pm »
My 026 has a compression release. Always did. But not all 026's had compression releases.
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Offline Cut4fun

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Re: Stihl Piston/Cylinder Kits
« Reply #27 on: January 04, 2013, 01:31:46 pm »
026 pro had de-comps too.
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Offline JohnG28

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Re: Stihl Piston/Cylinder Kits
« Reply #28 on: January 04, 2013, 01:32:26 pm »
I think it was the 026 PRO and 260 PRO designated (PRO label on the saw) models that had the decomp.  I believe the absence of that sticker left off the decomp and possibly the adjustable oiler also.

Beaten to the punch. ;D
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Offline 660magnum

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Re: Stihl Piston/Cylinder Kits
« Reply #29 on: January 04, 2013, 01:38:45 pm »
That's the general rule but with old chainsaws and many years of manufacture, you may see all the combinations mixed up.

You just have to take what you have and go with it.

My 026 Pro has been all redone and does not have the original cylinder/piston nor carburetor but it is stihl all 026 Pro much as it was originally and runs very well.



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