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Thread: Old Stihl FS80 Trimmer-I'm Exasperated!!!

  1. #11
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    Seditious, you're explaining to a moron.
    What is a reed valve, please?
    Plato once said, “Wise men speak because they have something to say. Fools, because they have to say something.”

    "Fere libenter homines id quod volunt credunt." "Men willingly believe what they wish to believe."
    Julius Caesar

    There's no natural calamity that government can't make worse.
    Bill Bonner

  2. #12
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    Quote Originally Posted by Davy Crockett View Post
    I did not yet check for that needle valve.
    This is a brand new (not rebuild) carb.

    I'm out of daylight for today.

    Which side is the top?

    I get nervous around carbs.
    When I was a kid, I tore enough carburetors apart and never successfully reassembled one
    Well I guess you don't have a model with a slide/needle valve. Probably just a simple diaphragm model (Zama? Walbro?) Zamas are usually swapped out for Walbros if possible. Older Huskys had the slide carbs.

    Hmmm.

  3. #13
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    Quote Originally Posted by Davy Crockett View Post
    Seditious, you're explaining to a moron.
    What is a reed valve, please?
    Two stroke engines use reed valves to meter the air fuel mixture into the cylinder during the correct stroke. If they don't seal during the compression stroke, the engine misfires. Sometimes they seal at low engine speed but fail to seal at higher RPM.

    Never mind. Your trimmer engine is piston ported and doesn't have a reed valve

  4. #14
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    Al, mine is a TK (?) carb
    Plato once said, “Wise men speak because they have something to say. Fools, because they have to say something.”

    "Fere libenter homines id quod volunt credunt." "Men willingly believe what they wish to believe."
    Julius Caesar

    There's no natural calamity that government can't make worse.
    Bill Bonner

  5. #15
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    If anyone has any suggestions (please), here is where I'm at.

    The machine starts really easily and will idle forever. I do have the idle set a little high.

    I can start and let it idle for a bit to warm up.
    When I squeeze the throttle slowly, it will accelerate to what sounds like a good operating speed.
    If I keep it running wide open for 15-20 seconds, it starts to bog down.
    If I let off the accelerator and slowly pull again, it won't fully rev.

    The last time I had it running while doing this, I had a little fire shoot out by where the muffler bolts to the cylinder
    Plato once said, “Wise men speak because they have something to say. Fools, because they have to say something.”

    "Fere libenter homines id quod volunt credunt." "Men willingly believe what they wish to believe."
    Julius Caesar

    There's no natural calamity that government can't make worse.
    Bill Bonner

  6. #16
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    Quote Originally Posted by Davy Crockett View Post
    If anyone has any suggestions (please), here is where I'm at.

    The machine starts really easily and will idle forever. I do have the idle set a little high.

    I can start and let it idle for a bit to warm up.
    When I squeeze the throttle slowly, it will accelerate to what sounds like a good operating speed.
    If I keep it running wide open for 15-20 seconds, it starts to bog down.
    If I let off the accelerator and slowly pull again, it won't fully rev.

    The last time I had it running while doing this, I had a little fire shoot out by where the muffler bolts to the cylinder
    Pull the piston and inspect. I read more than a few stories of erosion at the exhaust side port.

  7. #17
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    Thanks, Seditious.
    Makes semse but above my pay grade.

    Of course, it doesn;t work so I can't really break it
    Plato once said, “Wise men speak because they have something to say. Fools, because they have to say something.”

    "Fere libenter homines id quod volunt credunt." "Men willingly believe what they wish to believe."
    Julius Caesar

    There's no natural calamity that government can't make worse.
    Bill Bonner

  8. #18
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    Quote Originally Posted by Davy Crockett View Post
    If anyone has any suggestions (please), here is where I'm at.

    The machine starts really easily and will idle forever. I do have the idle set a little high.

    I can start and let it idle for a bit to warm up.
    When I squeeze the throttle slowly, it will accelerate to what sounds like a good operating speed.
    If I keep it running wide open for 15-20 seconds, it starts to bog down.
    If I let off the accelerator and slowly pull again, it won't fully rev.

    The last time I had it running while doing this, I had a little fire shoot out by where the muffler bolts to the cylinder
    Have you messed with the high-speed needle? Did you install the carb right out of the box? What you describe is a lack of fuel issue for some reason. You need to see what the standard in/out adjustment (from lightly seated hi/low adj.) is and go from there. Man, it's hard to do stuff without being there!

  9. #19
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    I appreciate everyone's help.
    I did install the carb out of the box.
    However, I have messed with the adjustments at least 1000 times.

    This is going ino the "It's no use being dumb unless you show it" category.

    I started to have doubts about my gas mix and decided to make a new mix and pay attention this time.

    New gallon of mix using my old, old, old outboard oil.
    Drained the tank and refilled with the new.

    Little harder to start at first but started. Put a few drops of Sea Foam in the tank and have been cutting for the past 45 minutes. Just starting my second tank.

    It still needs fine adjusted but it works better than it has in years.
    Working at all would be better than it has for years.
    Plato once said, “Wise men speak because they have something to say. Fools, because they have to say something.”

    "Fere libenter homines id quod volunt credunt." "Men willingly believe what they wish to believe."
    Julius Caesar

    There's no natural calamity that government can't make worse.
    Bill Bonner

  10. #20
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    Lol! Boy how we just glide past the BASICS sometimes, eh?

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