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Hyway MS660 Pop-up Piston.

Discussion in 'Chainsaws' started by Brewz, Jan 14, 2018 at 1:03 AM.

  1. Brewz

    Brewz Pretty don't cut faster

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    I was sent a newly developed MS660 piston from Hyway for testing.
    I was honored as they said it was the only test piston sent to Australia.

    Today I got out to compare it with an out of the box stock Hyway piston,
    I had a little oil pump trouble on the 2nd run but you get that with a china saw :facepalm:

    Anyway, I was quite surprised at the outcome.

     
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  2. drf256

    drf256 Giant Member (and Fartknocker)

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    Great vid Tony.
     
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  3. Brewz

    Brewz Pretty don't cut faster

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    Thanks mate.
    Here is a pic of the piston


    IMG_4327.JPG


    IMG_4328.JPG
     
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  4. smokey7

    smokey7 Pinnacle OPE Member

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    Very cool. Did you check squish with the new pop up piston? Seems to have made a meaningful difference. It seemd to hold rpm well with both pistons but just a little better with the popup. Nice work
     
  5. jacob j.

    jacob j. ONE OF THE GREATEST!

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  6. Frank bierce

    Frank bierce Pinnacle OPE Member

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    Well done Tony!! Looks like a good little bit of improvement!
     
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  7. blsnelling

    blsnelling Friend of the Riff Raff

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    I highly recommend you replace those circlips with OEM before one of those ears breaks off and trashes the cylinder. The saw sounds good.
     
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  8. Brewz

    Brewz Pretty don't cut faster

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    Yeah like I said in the video, the clips are getting changed out.
    The piston is coming out and getting lightened to be used in a race saw 066 project I have going on
     
  9. Brewz

    Brewz Pretty don't cut faster

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    I didn’t measure squish but I did check crown height with both mounted on the one pin and they were identical heights
     
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  10. smokey7

    smokey7 Pinnacle OPE Member

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    Correct me if im wrong in thinking that you mean that the squish area of the piston is same on both pistons? And that the pop up portion protrudes beyond the top of the stock crown height. So piston is truly like a welded popup piston and not a machined in one. Very nice if its like im picturing it to be.
     
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  11. mdavlee

    mdavlee Hillbilly grinder

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    Yes that is correct in your thinking. Drop in compression increase without machining.
     
  12. Poleman

    Poleman Pinnacle OPE Member

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    Wow Brewz, AWESOME detailed testing!!!! Your saw sounds good!!!!


    :campeon:
     
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  13. Brewz

    Brewz Pretty don't cut faster

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    That’s exactly what it is mate
     
  14. Wonkydonkey

    Wonkydonkey Super OPE Member

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    Umm, I,m lovin the popup, your saw sounds awesome too.

    Btw, top video,

    Cheers
     
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  15. Brewz

    Brewz Pretty don't cut faster

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    Thanks mate.
    The saw is a Chinese copy running a near stock cross performance top end.
    I have raised the exhaust from 104 to anout 101 and reshaped the exhaust roof but that’s it.

    If you look at the wash on the flat piston when I take it out in the video you can see that the pto side upper is opening before the flywheel side so I plan to go back in to correct that, lighten up the piston a bit and open up the windows and also change those rubbish clips for OEM.

    See how it goes then!
     
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  16. CR888

    CR888 Pinnacle OPE Member

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    Saw sounds and runs well. Good simple review that shows differences with just a piston swap. Does though kinda make me a little ill seeing a clone run every bit as well as my OEM saw that owes me $1250. Good Job!
     
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  17. Cut4fun

    Cut4fun Redneck Chainsaw Repair

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    Nice work. Thanks for sharing.
     
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