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Stihl 461 carb problems

Discussion in 'Carburetors' started by sidis8, Nov 14, 2017 at 8:19 AM.

  1. sidis8

    sidis8 Active OPE Member

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    Good morning everyone,

    New to the forum here. Learning a lot, bunch of great stuff on here.

    So here's my problem. Got a 461 that was rebuilt recently. Everything was running fine , no problems at all.

    So I go to start it yesterday and it won't run. Full choke and half choke is fine but it wont stay running.

    I tuned it a couple weeks ago with a tach, around 2800 idle and 13500 full load.

    So I check a few things last night, compression good at 160 ish, vac and pressure good also. Spark plug looks good.

    The only thing I changed was get some new gas from the fuel station down the street.

    Do you guys think it might be a ethanol issue ? I put the same gas in a 201t I have and she runs fine.

    Thanks for any help in advance.
     
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  2. RI Chevy

    RI Chevy Stihl Runner

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    Welcome to the forum. :cheers:

    Could be related to the LA adjustment?
    I would go back to a 1 and 1 preset and try tuning it again. If you still have no luck, try a different carb that you know is good.
    Plenty of members in NJ.
    @angelo c
    @LoneWolf
     
    Last edited: Nov 14, 2017 at 9:34 AM
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  3. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    So you tested the vac and pressure and it passed right?
    Like the above poster said go to 1 turn out on both jets and see what happens.
    Fuel filter on?
    Is fuel line cracked?
    Next try cleaning carb out with spray cleaner don't blow high pressure air in it!
    Next if that fails replace carb with OEM one otherwise you wont know whats failing the new carb or other parts.
     
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  4. sidis8

    sidis8 Active OPE Member

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    I reset the carb to 1 on each. Still has no luck last night. Gonna try a new carb tonight after work. Messed around with the la screw too.
     
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  5. sidis8

    sidis8 Active OPE Member

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    Yh, pressure held at 8 and same on vac.

    Fuel filter is on and I pressure and vac tested the fuel line too, passed with no problem.

    Deff gonna put in a carb that works in there, just gotta make it through the work day lol.

    Thank you
     
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  6. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    Clean the one you have first.
     
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  7. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    Maybe flooded clean the plug.
     
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  8. sidis8

    sidis8 Active OPE Member

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    So I messed around with the carb when I got home, nothing made it work.

    Put in a new walbro and she fired right up, no problem.

    Anybody have any ideas as why the other carb would fail like that ? It was brand new when rebuilt.
     
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  9. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    Blew high pressure air in it and damaged a valve?
     
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  10. Cracker Boy

    Cracker Boy Fl cracker

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    Ethonal is not good on small engines.my rebuild success has dropped on carbs since intrduction of ethonal.try to find non ethonal if at all poss.on my boat i used to have the worst problem with ethonal.what it does is draw moisture from the air it will actually etch.
     
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  11. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    I must have 40 bad carbs in a cardboard box.
     
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  12. Cracker Boy

    Cracker Boy Fl cracker

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  13. Cracker Boy

    Cracker Boy Fl cracker

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    Ethonal 1 out of 5 i can rebuild now allmost not worth 20 bucks on kit.spend toward new oem carb
     
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  14. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    You can get cheaper kits.
     
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  15. sidis8

    sidis8 Active OPE Member

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    I didn't use any high pressure air on it.

    Is there a good way to test the carb ?
     
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  16. sidis8

    sidis8 Active OPE Member

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    I think I'm gonna stop by the small local airport and see if I can get some of that ethanol free gas.
     
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  17. Cracker Boy

    Cracker Boy Fl cracker

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    Ask if they have 100 low lead thats what i run its bad azz it will clean your saws out.they will smoke and lead is a lubricant
     
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  18. Cracker Boy

    Cracker Boy Fl cracker

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    Welcome to the forum.you will catch on.
     
  19. Lone Wolf

    Lone Wolf Pinnacle OPE Member

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    Pressure test at the fuel pipe may show a leak, otherwise the real test is on the saw. H and L jets could be bent or mushroomed also. You could have put a part in wrong also go back and re check. Sometimes you just cant fix them because the problem is hidden in an inside passageway.
     
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