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ID cylinder.

Discussion in 'Chainsaw' started by alleyyooper, Apr 7, 2019.

  1. wcorey

    wcorey ArboristSite Guru

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    I assume you mean a windowed piston for a closed port cylinder?
    Terminology gets confusing with this stuff. An open port (cylinder) piston is 'closed'/non windowed, a closed port (cylinder) piston is 'open'/windowed...
     
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  2. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    You flatter me with your suggestion that there may actually be a direction to my spontaneous analytical musings. :surprised3:

    Finger ports.
    My introduction to chainsaw engines was entirely through the window of Husqvarna's Australian 1983 model range. As an EMAB subsidiary, more brands kept appearing on our sales & service inventory. First Partner, then Poulan & Pioneer came on board, each expanding my knowledge of the diversity of design concepts.
    It was Kevin Murray, then Pioneer's design engineer, who used the term "finger ports" to describe right-angled ports cast into the cylinder sides and rear by means of retractable "fingers" on both the inner dolly and the outer mould from beneath the cylinder base.
    This is not the same as sand cast bottom fed quad or dual ports found on Husky 480, 372, etc.
    as you describe, so I agree with your first paragraph.

    Re your second paragraph. On reflection, I was probably trying too hard to find an explanation for the subjective impression that the non-original piston saw performed better, when in all likelihood, no definable explanation exists.
     
  3. muddstopper

    muddstopper Addicted to ArboristSite

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    I did say that backwards. The piston is a windowed piston and my cyl are closed port.. I wrote that as I was waiting on the birth of my new granddaugther yesterday. 7lbs 15 oz. And forgive me, I am just looking for a way to fit her birth into a conversation. :numberone:
     
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  4. grizz55chev

    grizz55chev Tree Freak

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    Congratulations, your first?
     
  5. muddstopper

    muddstopper Addicted to ArboristSite

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    Thankyou, Yes this is my first great grandbaby. My grand daughter, the baby's mother, is 21yr old and her first. Her brother was there with his girl friend and I told them if they got busy we could have another in about 9 months. I also have two step great grandkids, both boys. Their dad is in the Navy and stationed in Jacksonville fla so we dont get to see them as often. The youngest is 3 and has had a heart transplant, so they dont get to come up and visit much as they sort of have to stay close to their heart doctor.
     
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  6. grizz55chev

    grizz55chev Tree Freak

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    My granddaughters are 20 and 15, but Greatgrandkids aren’t in the pic, yet.
     
  7. alleyyooper

    alleyyooper Addicted to ArboristSite

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    Found the old piston, ring was froze at the front near the muffler port.
    I got it off but just as I thought it was going to slip off the piston it broke.
    I was able to clean up the ring groove so the pice of ring i used fit fine.
    Also cleaned most of the scuff off the piston so think I am just going to buy a ring for this saw and get it running for the fellow who brought the box to me.

    Think this is the correct piston ring.
    https://www.jackssmallengines.com/Products/Castor/Pistons-And-Rings/Piston-Rings

    :D Al
     
  8. cus_deluxe

    cus_deluxe Thats what she said.

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    never heard of castor rings, guessing its a knock off of caber. for the few extra dollars id go with a caber but to each their own.
     
  9. grizz55chev

    grizz55chev Tree Freak

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    I’d also find out why the rings were smeared, pressure vac test is in order. The intake
    Grommet is a known leaker!
     
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  10. Huskvarna hotellgäst

    Huskvarna hotellgäst ArboristSite Operative

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    I think it's a Castor ring for a Caster trimmer, which just happens to fit the other pistons.

    I'm told that a 45mm x 1.5mm ring for a 154 /254 will work but I haven't tried it myself.
     
  11. alleyyooper

    alleyyooper Addicted to ArboristSite

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    The story I was told was the saw was some how ran lean. when they took the carb off and apart it was full of fine saw dust where the diaphran is.

    That is what it looked like to me also lean condition or a quick straight gas.

    haven't seen a caber ring sourse for the 45mm. x 1.5mm

    :D Al
     
  12. cus_deluxe

    cus_deluxe Thats what she said.

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    ebay
     
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  13. alleyyooper

    alleyyooper Addicted to ArboristSite

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    Don't do E bay and pay pal.

    :D Al
     
  14. wcorey

    wcorey ArboristSite Guru

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    Northwood Saw
     
  15. alleyyooper

    alleyyooper Addicted to ArboristSite

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    OK found them.

    :D Al
     
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