HELP! STIHL MS 250 Pop-Up Piston Compatibility with Heads

[Bada_Bing13]

Hi,
I recently rebuilt a Sthil MS 250 for a friend and had ordered a pop-up piston from LRB for it. I tried matching it with a Hyway Head and it wouldn't work. It kept hitting every time around or we set it aside for the Hyway one that came in the kit.

Now I just bought my own MS 250 to Rebuild, I was wondering if there's a Head out there that can take the LRB Pop-up Piston(Besides the Stihl O.E.M One ) That anyone knows of ?!??

Any Help is appreciated
Thanks !!!

 

[David Young]

Why not cleanse the piston? Should be able to figure where it hits and file or dremel it down

 

[David Young]

How tall is the popup?

 

[Chainmale]

And/or squish band?