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Purpose and correct name of plastic inserts in 2-stroke cylinder

Motor Vehicle Maintenance & Repair Asked by Unimportant on March 6, 2021

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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