78mm Standard Bore Cylinder 12100-KRN-670 12100-KRN-672 12100-KRN-730 12100KRN731 for CRF250R CRF250X 2004-2017 Motorcycle This standard bore cylinder is designed for use with CRF250R and CRF250X models from 2004 to 2017.Constructed from cast aluminum, it offers strength and resistance to wear during regular.The 78.00mm bore size supports consistent engine performance and is suitable for standard displacement configurations.The cylinder is engineered to fit using specifications, proper alignment and function within the engine assembly.It corresponds to OE numbers 12100-KRN-672, 12100-KRN-730, 12100-KRN-731, 12100-KRN-732, and 12100-KRN-670, allowing for accurate replacement without modifications.Designed for off-road applications, the cylinder is built to endure elevated operating temperatures.Its construction supports stable performance under demanding riding conditions.The design focuses on durability and efficient power delivery, making it a functional upgrade for routine maintenance or rebuilds.