ArboristSite.com Sponsors
 
 


Another build thread - Farmertech MS660

Discussion in 'Chainsaw' started by Rick Stephens, Dec 6, 2018.

  1. Rick Stephens

    Rick Stephens ArboristSite Member

    Joined:
    Nov 14, 2018
    Messages:
    67
    Likes Received:
    75
    Location:
    Idaho
    I beg your forgiveness for starting another 660 build thread. I bought this box of parts during the members sale since it was so discounted. I really don't need another saw, Already have a couple 361s I am using to test various modification on. But you know how it is, CAD strikes where it will. At the time, I had a buddy who really wanted a 660 kit but at the last second bailed on our order. I figured he'd want it when it came in, but so far hasn't bit. I can't walk by the box any longer :p

    I started out doing inspections, then assembled the cases to check squish and do some port planning. I had no intention of posting on the forums until I got surprised by, first, what seemed to be a better made cylinder than expectations. And second, by the squish I got. To go back one more step, when I opened the cylinder box they had packed the base gasket in with the cylinder and the gasket didn't survive the experience. I figured it wouldn't matter since in pretty much all my past Huztl builds the base gasket got deleted with squish being in the 40 thou range with a base gasket on every saw. Not this time. When I did a dry assembly without the base gasket the piston contacted the head. I installed the (worn through) base gasket and came up with between .018 and .020 measured all the way around. WTH - where'd a pleasant surprise come from on a kit saw? Much better manufacturing limits than I ever expected here.

    The plating on this cylinder appears very consistent and heavier that I have seen in past builds. (I also did an MS250 back a while ago, and its cylinder was very well made and the plating was excellent - although other things were less precise on the MS250 manufacturing) The ports on this 660 are reasonably well done, but the edges are rough and sharp. I really wouldn't want to assemble this saw without cleaning up the ports at a minimum. I intend to do more than that with the ports and will need/want input from more experienced on increasing performance where justified. I want to open up a little, maybe add open finger ports for what looks to me to be a tiny upper transfer port. Suggestions more than welcome. Not looking to raise the power band. Maybe a misplaced goal, but seems if I am going to grind on it, might as well target reliable grunt power. Unlike the 361s where I am trying things like changing out carburetor and manifold to 440 parts, and getting progressively bigger ports, this saw needs to be a conservative target that I don't have to redo over and over again with the goal of reliable and not peak HP.

    A couple starting place pics, comments suggestions welcome. Thanks for reading.

    Rick dance.gif


    exhaust1.jpg transfers1.jpg transfers2.jpg
     
    Woody harrelson and cuinrearview like this.
  2. cuinrearview

    cuinrearview Addicted to ArboristSite

    Joined:
    Oct 24, 2014
    Messages:
    3,225
    Likes Received:
    5,166
    Location:
    Hillsdale, MI
    Lol what does a bad one look like?
     
  3. Rick Stephens

    Rick Stephens ArboristSite Member

    Joined:
    Nov 14, 2018
    Messages:
    67
    Likes Received:
    75
    Location:
    Idaho
    How about cracks, scrapes, chips?

    bad.jpg
     
    cuinrearview likes this.
  4. cuinrearview

    cuinrearview Addicted to ArboristSite

    Joined:
    Oct 24, 2014
    Messages:
    3,225
    Likes Received:
    5,166
    Location:
    Hillsdale, MI
    Yah. I thought you meant "good", but you meant "good for FT":yes:. I misunderstood. Sorry.
     
  5. Rick Stephens

    Rick Stephens ArboristSite Member

    Joined:
    Nov 14, 2018
    Messages:
    67
    Likes Received:
    75
    Location:
    Idaho
    LOL. Yup, good is relative. You really do have me laughing.
     
    Woody harrelson and cuinrearview like this.

Share This Page