Hello from Romania! I have a Remington SL 11 saved from the dump. The piston and cylinder are dead. Is this engine used on other saws[Homelite XL] .It seems to be 48,5 bore X35 stroke.
Remington 'engine' is unique to Remington saws.
But, there is a strong possibility that the Homelite Super XL piston will fit/function in the Remington SL-11 or PL-5.
I have not personally tried one yet.
New Homelite pistons are offered by eBay seller llrdbrn.
Good luck with your project.