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I recently replaced the cylinder and piston on a broken chainsaw 2-stroke engine and I found 2 plastic inserts inside the cylinder. I'm wondering what purpose these serve, and what the correct name for them is.

Plastic inserts inside cylinder

Plastic inserts outside cylinder

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  • Port seals come to mind, but some parts manuals may differ.
    – Solar Mike
    Aug 2, 2020 at 10:53
  • Also, if you gave us the make/model/size of the engine, it would surely help us to understand exactly what you're pointing at. As Mike states, things differ between manufacturers. Aug 2, 2020 at 13:10

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