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Stihl MS 170 Mod Oh Yeah Baby!

Discussion in 'Chainsaw' started by tmessenger, Feb 17, 2014.

  1. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    Workin on mine right now.
    Whats the trick to getting the wrap handle off?
     
  2. treesmith

    treesmith tree hugger/cutter

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    Should come off easily, you'll have to drill holes for H+L screws in the cover but the idle already has one. Nothing hard as I remember. What muff mod did everyone do? I bent the fins open on the cover and drilled it
    out underneath.

    Sent from my GT-I9210T using Tapatalk
     
  3. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    Hi Folks - Hoping someone can help me here... I did the exhaust mod and installed a WT-215 carb on my MS170. It idles great but when I whack the throttle open, it bogs and dies. While the H screw adjust does seem to make a difference in the running of the engine, it does not get rid of the bog. It runs good until warm, so I am guessing that it's a rich bog? Any suggestions?
     
  4. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    Did you pull the brass plug in the impulse circuit?
     
  5. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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  6. 1Alpha1

    1Alpha1 100% USDA certified abnormality-free.

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    Depends on who's looking for me.....and why.
    Slap a MAGNUM sticker on it and then you'll really have something to brag about.
     
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  7. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    I saw that plug but couldn't tell if the OEM carb had a complete passage or not. I have not messed with it. What does that do, meter 'draw' on the high speed circuit
     
  8. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    IMG_0044.jpg

    Boom!
     
  9. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    It’s the impulse passage.
    Pull the center plug and block the side one with sealant
     
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  10. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    Thank you!
     
  11. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    Finished product - does this look right?

    upload_2018-12-19_9-9-10.png
     
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  12. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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  13. Tim Moffett

    Tim Moffett ArboristSite Lurker

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    Cool thank you! The trail gods will be happy today!
     
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  14. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    Let me know how runs now :)
     
  15. Henry E

    Henry E ArboristSite Lurker

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    To get rid of the bog, you richen (back out/counter clockwise) the Low screw (closet to the cylinder). Not the High.
    Generally you back out the low screw until you hear the revs just start dropping, then turn it back in just a hair.
     
  16. Adirondackstihl

    Adirondackstihl Flyz, Fuel & Fotos

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    Did you read anything here or just post based off the original post?
     
  17. Schipp

    Schipp ArboristSite Operative

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    What kind of sealant did you use to block the side hole? UPDATE: I read I can use “Plumbers sealant”!
    Another question though! Do you have to pull that plug on all WT-215 carbs when you put it on the 170? Or are some of them already open there?
    Ok, thanks!
     
  18. Andrew Massey

    Andrew Massey New Member

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  19. Schipp

    Schipp ArboristSite Operative

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  20. Ando81

    Ando81 ArboristSite Member

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    Hi all, I have just fitted a Chinese copy of the Walbro 215 carb to my Ms170. It took a bit of tweaking in the adjustment screws to suit my Australian conditions but the saw is a lot more throttle responsive. It was getting late and I didn’t want to disturb my neighbours by trying it in a piece of solid wood but I’m confident that it’ll be a big improvement. Muffler mod to follow soon
     
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