Did I get the Wrong Piston?

[MrWhoopee]

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

 

[greg13]

Get the Micrometer out and measure it up. I would guess it's an updated piston.

 

[rkshed]

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.

 

[MasterMech]

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.

 

[MrWhoopee]

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.

 

[smokinj]

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.

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)

 

[Jags]

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.