These are homemade copper cylinder head inserts for an Aprilia.
This is what I would call " a copper cylinder head insert to conduct combustion heat away faster "as apposed to a detonation insert which is more of a ring around the squish band area.
I have not been able to find a Honda or Aprilia RS125 head thats been ceramic coated.
Would like to confirm if the Yamaha ones actualy exist, and a pic would be nice.
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