yes to put sleeves in you have to bore for them, but you also have to bore for oversize piston and rings. There are pistons/rings for .5mm and 1.0mm oversize. I would not think about rebuilding unless the engine was puking smoke and oil at idle or worse. A amature rebuild is worse that and old good running orginal engine. If it aint broke, don't fix it.o so if i want to rebuild i need to take it to the machine shop. i was hoping i could do it my self.