stihl fs80 string trimmer lacks power

Discussion in 'Homeowner Assistance Forum' started by rknarr2, Aug 12, 2009.

  1. hate2work

    hate2work LawnSite Member
    Posts: 91

    Robert, you shouldn't have to change your carb, as both styles of shortblocks are still available. See my post above for the part numbers.

    Good luck :)
     
  2. rknarr2

    rknarr2 LawnSite Member
    Posts: 16

    I realize that I made a mistake on the carb because you had given me both blocks for the different carbs and I wrote a post above on it. If I could have edited when I realized it, I would have edited the post that I made the mistake in instead of a new post.
    Thanks
    Rob
     
  3. topsites

    topsites LawnSite Fanatic
    Posts: 21,654

    All right, here's what you do:

    1. Take that POS and hurl it in the general direction of the trash, try and get some good air with it or throw it in such a
    way that you might get at least some satisfaction... But if that doesn't work, a big hammer can do wonders as well.
    2. Go back to the Stihl Dealer and get yourself a brand new trimmer, a nice one run you 250-300.
    3. Chalk one up to experience.
    4. Over and out, done.
     
    Last edited: Sep 13, 2009
  4. rknarr2

    rknarr2 LawnSite Member
    Posts: 16

    I have to replace the piston on my stihl fs80r weed trimmer. The top of the piston has carbon powdery deposit on it while the side of the piston has scratch marks and there is a burnt place on the side and top.
    1. Would the burnt place on the side and top be from the spark plug during sparking process and is that normal to see that?
    2. Before I change out the piston, what is used to clean the carbon deposit out of the inside bore of the existing used cylinder? I am not sure what to use gasoline, mineral spirits, propyl alchohol, starter fluid, carburator cleaner etc...

    Thank you for the assistance.

    Robert
     
  5. rknarr2

    rknarr2 LawnSite Member
    Posts: 16

    Anyone have idea where I find some good cheap priced but in good used or new good Stihl parts for a Stihl fs 80 string trimmer as follow?
    Part No. Part Description
    4137 020 2800 Crankcase, starter side
    4137 030 2010 Piston
    4137 180 1150 Throttle cable

    Thank ya much.
    Robert
     
  6. STIHL GUY

    STIHL GUY LawnSite Fanatic
    from CT
    Posts: 5,225

    i just cleaned the exhust screen in my trimmer and what a diffrence. i heated it up with a torch and cleaned it off with a wire brush and its good as new
     
  7. rknarr2

    rknarr2 LawnSite Member
    Posts: 16

    I appreciate the advice about the muffler restriction but I had Stihl repairman who showed me top cracked off edge on the crank case, starter side and the scratches on the piston. Plus, I put on a brand new muffler before I took the trimmer to the Stihl repairman. Thank you.
    Robert
     
  8. countryboy36266

    countryboy36266 LawnSite Member
    Posts: 3

    i got the same problem i try everything to still want idle i put the carburetor on another fs80 and it run fine change flange gasket replace carb still wont idle
     
  9. countryboy36266

    countryboy36266 LawnSite Member
    Posts: 3

     
  10. countryboy36266

    countryboy36266 LawnSite Member
    Posts: 3

    i had the same problem i try everything change intake plate carb,gasket, fuel line filter, everything then i change the coil that fix my problem maybe this will help
     

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