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Thread: Chainsaw won't run right.

  1. #1
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    Default Chainsaw won't run right.

    I have a Stihl MS170 that will crank easily but bogs when I try to rev it up. I can gently rev it and get it spun up but a rapid stab on the trigger makes it shut off. It also has poor torque when I try to cut with it. I've replaced the fuel with fresh fuel. I've replace the carb and carb gasket. Fuel lines and filters seem good and not clogged. Any chainsaw whisperers here that can offer advice?

  2. #2
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    Carbon buildup in the muffler, muffler screen
    Houndsmen are born, not made

    Quote Originally Posted by 2thDoc View Post
    I STAND WITH DUCK CUTTER!
    Quote Originally Posted by JABIII View Post
    I knew it wasn't real because no dogbox...

  3. #3
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    Quote Originally Posted by Duck cutter View Post
    Carbon buildup in the muffler, muffler screen
    I cleaned that and smoked the muffler with a torch. I'm pretty sure that isn't it but I'll check it again.

  4. #4
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    Checked the air filter?
    Yeah, but do you consider a dog to be a filthy animal? I wouldn't go so far as to call a dog filthy but they're definitely dirty. But, a dog's got personality. Personality goes a long way.


    You might take out a dozen before they drag you from your home and skull fuck you to death. Marsh Chicken 6/21/2013

  5. #5
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    Muffler screen, easy fix. And replace the spark plug.
    Last edited by Whackumstackum; 02-28-2023 at 10:32 AM.

  6. #6
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    old fuel still in the lines. I had the same issue last weekend with the same saw. I let it idle for 5 minutes or so and then she warmed up and cut just fine.

  7. #7
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    Quote Originally Posted by Saltydog235 View Post
    Checked the air filter?
    Yes and replaced it with a new one. I have even run it without an air filter.

  8. #8
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    Quote Originally Posted by Meathook View Post
    old fuel still in the lines. I had the same issue last weekend with the same saw. I let it idle for 5 minutes or so and then she warmed up and cut just fine.
    Replaced fuel, replaced spark plug, ran it for quite a while even at a high rpm. I'm using fresh fuel that runs fine in my other saws and brush cutter. This isn't a very old saw either.

  9. #9
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    Change the fuel lines and filter. Even if the filter doest look clogged it can be
    I am a nobody, that met somebody, that can save anybody.

  10. #10
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    Replace primer bulb too. A pin hole leak there in a buddy’s hedge trimmer drove me insane trying to figure it out. Had same symptoms


    If a man is alone in the woods, says something, and a woman does not hear, is he still wrong?

    Bipartisan usually means that a larger-than-usual deception is being carried out. óGeorge Carlin

    Common sense is not a gift. It's a punishment because you have to deal with everyone else who doesn't have it.

  11. #11
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    That ms170 doesn’t have a primer bulb
    Houndsmen are born, not made

    Quote Originally Posted by 2thDoc View Post
    I STAND WITH DUCK CUTTER!
    Quote Originally Posted by JABIII View Post
    I knew it wasn't real because no dogbox...

  12. #12
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    I'm going with partially blocked jet. There's not much to that carburetor. Pull off the diaphragm cover and check diaphragm, then clean and blow out housing. A set of orifice drills will get the jet cleaned out proper even if it looks clear.

    Edit: after checking lines and replacing filter like said above.
    Last edited by CurLee; 02-28-2023 at 11:56 AM.

  13. #13
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    Check compression. No E fuel if feel sure has never been in the tank?
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"

  14. #14
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    Put some seafoam in it.
    Molon Labe
    HRCH Coal's Sparkleberry Cache MH

  15. #15
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    I'll give you $50 for it
    Amendment II A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

    Quote Originally Posted by Highstrung View Post
    I like fishing topwater. Will one of you jot down some of this redneck ghetto slang and the definitions for those of us who weren't born with a plastic spoon in our mouths?

  16. #16
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    Ain't got no gaasss in it

  17. #17
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    60bucks for it
    Gettin old is for pussies! AND MY NEW TRUE people say like Capt. Tom >>>>>>>>>/
    "Wow, often imitated but never duplicated. No one can do it like the master. My hat is off to you DRDUCK!"

  18. #18
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    last 2 times mine acted up it was because the fuel pick up line inside the tank cracked.

  19. #19
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    Replaced carb. No primer bulb. I put seafoam in it. Replaced fuel line and fuel pickup filter once. I don't have a compression tester but it seems to have decent compression judging by how hard it is to pull start with and without the plug and feeling the pressure at the spark plug hole with my thumb while I pull the rope.

    I don't sell stuff.

  20. #20
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    let it run idle for a few minutes.
    Ugh. Stupid people piss me off.

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