This is a complete Bolt On Overbore piston kit that comes with new piston, rings, pin & clips, gaskets, and cylinder. Cylinder is a stock honda 250es/sx cylinder that was vapor honed clean, then bored and honed to spec.
These bolt on kits are higher than stock compression but still pump gas friendly.
*A Core charge is applied to this sale! You can get that Core back by sending us your stock undamaged cylinder after installation of your new bolt on overbore kit*