Did I get the Wrong Piston?

MrWhoopee Posted By MrWhoopee, Aug 26, 2012 at 5:49 PM

  1. MrWhoopee

    MrWhoopee
    Minister of Fire 2.
    NULL
    

    Sep 27, 2011
    600
    346
    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
     
  2. greg13

    greg13
    Minister of Fire 2.
    NULL
    

    Jan 5, 2012
    609
    136
    Loc:
    CNY
    Get the Micrometer out and measure it up. I would guess it's an updated piston.
     
  3. rkshed

    rkshed
    Feeling the Heat 2.
    NULL
    

    Jan 15, 2012
    269
    77
    Loc:
    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 2.
    NULL
    

    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 2.
    NULL
    

    Sep 27, 2011
    600
    346
    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 2.
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    Aug 11, 2008
    15,981
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    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 2.
    NULL
    
    Staff Member

    Aug 2, 2006
    17,425
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    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.
     

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