Author Topic: Stihl fs 80  (Read 1319 times)

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Offline JohnG28

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Stihl fs 80
« on: March 23, 2015, 11:22:12 am »
Anyone have any info on these? Google search doesn't turn up all that much in depth information. There's one for sale locally for a decent price  (I think) of $150. It seems as though they were made for a long time, 80s and 90s, but not sure if as recent as last 10 years or so? Anything to watch for on these? Solid shaft or no? Any way to tell date of manufacturing by s/n? Appreciate any info.

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Offline Cut4fun

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Re: Stihl fs 80
« Reply #1 on: March 23, 2015, 01:43:30 pm »
I know nothing, but quick search shows STIHL 25.4 cc , flex cable drive.

http://www.backyardboss.com/mfg_Stihl/FS80.aspx
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Offline Cut4fun

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Re: Stihl fs 80
« Reply #2 on: March 23, 2015, 01:44:27 pm »
says the fs85 had a soild shaft in above read.  The fs80 flex cable type shaft.
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Offline Eccentric

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Re: Stihl fs 80
« Reply #3 on: March 23, 2015, 10:29:50 pm »
There were two different FS80 Stihls.  The more recent one (that is actually a Stihl design) is shown in that Backyardboss link.

The early FS80 was a Shindaiwa design.  Sold by Stihl in the early-mid 1980's.  I have a 1983-1984 or so production FS80AVRE that my Grandpa bought new.  Big heavy Shindaiwa design.  Has a TK slide valve carb.  Mine doesn't owe anyone a damn thing, having given 20 years of hard service before being retired for the most part.  It still runs, but is tired.  I'll post a few pics later tonight if can find them...

-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.
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Offline RoyM

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Re: Stihl fs 80
« Reply #4 on: March 23, 2015, 11:52:06 pm »
I am keeping my eyes open for one or an FS 85, they are real workhorses and I am partial to old school 2 strokes. Parts are readily available. $150 seems a fair price for a good one but I would not pay more than that. We are moving to an acreage in a month and my little Echo curved shaft just isn't going to do the job.
Old age and treachery always overcome youth and enthusiasm

Offline Eccentric

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Re: Stihl fs 80
« Reply #5 on: March 24, 2015, 01:29:51 am »
There are still lots of parts floating around.  I JUST missed buying an NOS P/C set for peanuts a few years ago.  An ebay oops.......
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline pete

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Re: Stihl fs 80
« Reply #6 on: March 24, 2015, 06:14:22 am »
I ran an fs80 in the early 80s for my lawn mowing round couldn't kill it still a runner today, only problem I have had was trying to get  a new in tank fuel line took me a bout 12 months to find one. It sits for months at a time without being used But I pull it out for long grass jobs with a steel blade. Scored another recently should be a runner as it fires on carb prime. That one was a freebie

Offline JohnG28

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Re: Stihl fs 80
« Reply #7 on: March 24, 2015, 10:54:44 am »
Thanks for the input guys. That site C4F posted was the best I had found also, missed the details on flex shaft in there though. Sounds like positive feedback so that's a good deal. From reading I found the old ones with slide carb have all the carb screws in a vertical row, is this correct? Going to shoot over to look at it later today or tomorrow I think. Don't have a lot to use it on but then I could leave the one I have now at the camp up north. Thanks again!

Offline 660magnum

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Re: Stihl fs 80
« Reply #8 on: March 24, 2015, 11:18:09 am »
I do not have a FS-80.

I do have four FS55R weed whackers. One was originally a standard FS-55 and two were always FS-55R's and one was originally a FS-45 curved shaft weed whacker. All four are the 27.2cc #4140 two stroke power head.

Two of these have Straight shafts, gear heads and guards from FS-90 four strokes and two have their original FS-55R straight flex shafts, gear heads, and guards. All four look like FS-55R's

The FS-90 solid steel shaft units have a heavier feel than the flex shaft versions. This is partially due to the fact that the solid steel shaft FS-90 is 6" longer than the FS-55 straight flex shaft. The flex shaft itself weighs less than the solid steel shaft for the flex wound wire shaft is hollow. Operationally for me one works as well as the other and I have never had any trouble with the flex type shafts.
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Offline Eccentric

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Re: Stihl fs 80
« Reply #9 on: March 24, 2015, 03:25:52 pm »



Here's my old style FS80AVRE.  Absolutely no relation to the later FS80.  My machine has a solid drive shaft.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

 

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