1. Welcome Hearth.com Guests and Visitors - Please enjoy our forums!
    Hearth.com GOLD Sponsors who help bring the site content to you:
    Hearthstone Soapstone and Cast-Iron stoves( Wood, Gas or Pellet Stoves and Inserts)
    Caluwe - Passion for Fire and Water ( Pellet and Wood Hydronic and Space Heating)

Did I get the Wrong Piston?

Post in 'The Gear' started by MrWhoopee, Aug 26, 2012.

  1. MrWhoopee

    MrWhoopee Minister of Fire

    Joined:
    Sep 27, 2011
    Messages:
    567
    Loc:
    Shingletown, Northern California (elev. 4000 ft.)
    Just compared the old and new piston's for my '81 Husqvarna 61 Rancher. Substantial difference to say the least. Everything says it's the right one, they both have a B stamped on the top of the piston. Is this one of those progressive refinements or did the Greek send me the wrong one?
    HELP!!!
    New piston is on the left P1000885.JPG

    Helpful Sponsor Ads!





  2. greg13

    greg13 Feeling the Heat

    Joined:
    Jan 5, 2012
    Messages:
    446
    Loc:
    CNY
    Get the Micrometer out and measure it up. I would guess it's an updated piston.
  3. rkshed

    rkshed Feeling the Heat

    Joined:
    Jan 15, 2012
    Messages:
    256
    Loc:
    Bedford NH
    I would say its an updated piston. The change occurs from time to time in the motorcycle world. Perhaps it was found that less piston skirt provides quicker revving.
  4. MasterMech

    MasterMech Guest

    You won't know until it's in the cylinder but it looks like the timing might be affected. That can be a positive thing. Test fit it in the cylinder, if it checks out, then I'd go ahead and put it together.
    smokinj likes this.
  5. MrWhoopee

    MrWhoopee Minister of Fire

    Joined:
    Sep 27, 2011
    Messages:
    567
    Loc:
    Shingletown, Northern California (elev. 4000 ft.)
    I checked all the dimensions, everything is exactly the same except the ring is about .03 closer to the top of the piston. I recall reading something about this type of change to the piston skirt in the later saws, just wondering if it will work with the older cylinder.
  6. smokinj

    smokinj Minister of Fire

    Joined:
    Aug 11, 2008
    Messages:
    15,972
    Loc:
    Anderson, Indiana
    Should not be a issuse gasket sizing should be check carefully just to make sure it does not smack the top of the head. (Pretty easy)
  7. Jags

    Jags Moderate Moderator Staff Member

    Joined:
    Aug 2, 2006
    Messages:
    14,856
    Loc:
    Northern IL
    And if that ring is closer to the top than the original - make DARN sure there is no ridge on the cylinder walls, at all.

Share This Page