ArboristSite.com Sponsors
 
 


372 Pston swap/mod

Discussion in 'Saw Building 101' started by trappermike, Jul 20, 2018.

Tags:
  1. Yotaismygame

    Yotaismygame saw me up

    Joined:
    Nov 1, 2017
    Messages:
    832
    Likes Received:
    534
    Location:
    Orgone
    Was running the XT carb which has a rather large venturi. Blow down could be it, personally I think its the piston characteristics. I think compression needs to be above 170 to make a 372 with a 268 piston strong. I never run short bars on my saws when i test them because the guys who buy them don't run short bars. Buried with a 28" bar in fresh fir wasnt some thing it liked. The Jred I posted I wouldn't say went through a true test. The two of these I've built with compression above 180 were both all around strong saws. That jred sure does scream more but I'd like to see how it does with a 28" in some harder wood. In another thread trappermike advised me not to raise the transfers on the lazy jug.

    Just thinking out loud here. Thanks for the input.
     
  2. Leafy

    Leafy ArboristSite Operative

    Joined:
    May 2, 2018
    Messages:
    153
    Likes Received:
    81
    Location:
    Nh
    I think if you have a saw that you took the exhaust that much too high it needs a bigger carb than that, it'll need to rev to make any power at all.
     
  3. old guy

    old guy Addicted to ArboristSite

    Joined:
    Oct 23, 2008
    Messages:
    1,286
    Likes Received:
    1,964
    Location:
    Becker Mn
    FYI, I tried to put an oem ring in a hyway 353 piston & it would not compress enough to get the cyl. on.
     

Share This Page