Why they put sleeves/liners in. Dear Bryan, I would like to reply to your question. There is no over size piston for the engine 4E FTE. So we had to use standard size piston to rebuild it. As the cylinders were worn off, the block was supplied sleeves/liners. We KSS adopted the way, hit the sleeves/liners into the cylinders at first, bored and horned next and made them to maker’s specification. Finally we assembled. We remanufactured the condition of the engine as well as that of new one. Best regards, Yoko