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My friend installed a Hyway popup piston in his 261C

Discussion in 'Chainsaws' started by GlocknStihl, Oct 29, 2018.

  1. GlocknStihl

    GlocknStihl Derelict OPE Member

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    It's all stock except for the Hyway piston and base delete. Cutting oak.


     
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  2. BonScott46

    BonScott46 Super OPE Member

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    No muff mod? What is the squish with the delete? 3/8ths?
     
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  3. GlocknStihl

    GlocknStihl Derelict OPE Member

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    I was thinking of his other saw. This 261 is 0.030" WITH the gasket. No muffler mod.
     
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  4. RI Chevy

    RI Chevy StihlMar Runner

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    Nice job. Wood looked like marble with the knotts.
    I guess that it is a regular carbed saw?
    Any idea on compression?
     
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  5. BonScott46

    BonScott46 Super OPE Member

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    261c by the looks of the recoil.
     
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  6. GlocknStihl

    GlocknStihl Derelict OPE Member

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    M-Tronic saw. I'll ask him about the compression. It was a brand new saw. Got straight gas on the 3rd or 4th tank. He paid $100 for it, cleaned the cylinder up, I gave him a piston and there are the results.
     
  7. BonScott46

    BonScott46 Super OPE Member

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    Hundred bucks well spent.
     
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  8. GlocknStihl

    GlocknStihl Derelict OPE Member

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    Hyway Popup
    Caber Rings
    Squish was 0.030" with the gasket. He checked compression, looks to be 198/199.

    IMG_7686.jpg
    IMG_7687.jpg
     
  9. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    That’s nearly perfect. I bet 10 off the base gives you 220.

    What’s the compression on a stocker? Anyone know?
     
  10. RI Chevy

    RI Chevy StihlMar Runner

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    Nice job. Should be a good runner.
     
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  11. BonScott46

    BonScott46 Super OPE Member

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    Being the saw is a strato is the piston an exact copy of the oem so that the timing remains the same?
     
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  12. drf256

    drf256 Dr. Richard Cranium (“RC” to Muh pals)

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    I'm getting one. Gonna Mic the entire slug.

    @Jchin is allowing his 261 to be the Guinea (why you gotta say guinea?) Pig for this slug. Planning on a muff mod, then before and after slug swap including base cut for .015 final squish.

    I will video pulling a bar size it has no business running.
     
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  13. GlocknStihl

    GlocknStihl Derelict OPE Member

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    They "look" identical.
     

    Attached Files:

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  14. Stihlsmoking

    Stihlsmoking City Hillbilly

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    I’ll be interested in the muff mod as I may do that to my saw ? Or send muffler you for mod. Thanks
     
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  15. Redfin

    Redfin Meh...

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    Bout #145-150
     
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  16. GlocknStihl

    GlocknStihl Derelict OPE Member

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    Um you Guinea pig my 261! Forget John, I'll give you 4 more pistons for free lol
     
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  17. CR888

    CR888 Pinnacle OPE Member

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    175psi here on a stock saw no machine work. Others have been 165-180psi that I've owned.
     
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  18. GlocknStihl

    GlocknStihl Derelict OPE Member

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    @drf256

    Here is a pic of my stock 261 piston, beside the popup. I used the rings to even them up. The factory piston seems to be as tall as the "popup" on the Hyway.

    20181104_190418_crop_720x651.jpg
     
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  19. nohoff

    nohoff professional flusher

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    Please measure the distance between the top of the pin hole and the top of the piston on both.
     
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  20. RI Chevy

    RI Chevy StihlMar Runner

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    I have a new meteor piston. But no way to measure it.
     
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