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Stihl fs90 spinning on idle

Discussion in 'Mowers and More' started by shiggins, Nov 19, 2022.

  1. shiggins

    shiggins New OPE Member

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    Hi, im new to the group.
    My fs 90 wasn't idling. Woudl start well and then stall when letting it idle. Haven't used it in a couple of years. Used new fuel etc.

    I went to check what the L and H screws were set too so screwed them in seated and then back to position. Both 3/4 turn, however It didn't matter as they are fully open to the restrictor caps anyway.
    I screwed the idle in a bit and gave it a bit of carby cleaner.

    It's running now but when I back the idle off it keeps spinning and eventually stalls while spinning. If I hold the spindle at the cutting end it stalls straight away. The clutch spring is ok although looks a bit rusty.

    Any help ?[​IMG]

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  2. Turd Ferguson

    Turd Ferguson Active OPE Member

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    I'd try a new carb - especially if it hasn't run in awhile. Aftermarket carbs are cheap enough and pretty straight forward to replace. While you are at it new fuel lines and filter wouldn't hurt.
     
  3. Canadian farm boy

    Canadian farm boy “Normal” people scare me. GoldMember

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    I’m not familiar with this model but it sure looks like 1 of the clutch shoes is stuck. If the clutch is slightly engaged it will drive the spindle even at idle and can cause the stalling at idle speed and your idle tuning issues.
     
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  4. shiggins

    shiggins New OPE Member

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    The primer was broken so it's a good shout. The carb could have some *s-word in it.

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  5. shiggins

    shiggins New OPE Member

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    The top one ? Good point. I'll get it off and have a look.

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  6. Filthyphil

    Filthyphil OPE Member

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    Im having the same problem with mine. The clutch was sticking. The drum and clutch was all rusty. I cleaned everything up and tried again its good till i hit the throttle then it get stuck again. It seems simple and should be easy to figure out but i cant seem to fix it. Gonna end just buying a new clutch.


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  7. shiggins

    shiggins New OPE Member

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    I think they are pretty cheap hey.

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  8. Filthyphil

    Filthyphil OPE Member

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    I wanna say the full setup was like $80. More then i wanted to spend. I just got three more in a parts lot i bought. Gonna try to make one good clutch from those three machines but im not gonna hold my breath.


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