Motorcycle 66mm Air Cylinder Block for CRF150R CRF150RB Expert 2007-2009 2012-2021 2022 Expert 2016-2021 12100-KSE-670 This air cylinder block is designed for the CRF150R and CRF150RB models from 2007 to 2022, including the Expert series.It features a 66mm bore size and is constructed from aluminum with a ceramic-coated cylinder wall for improved durability and performance.The unit serves as a direct replacement for parts, allowing for straightforward installation without compatibility issues.It is suitable for use in both recreational and competitive off-road riding conditions.The cylinder can endure operating temperatures, supporting engine under demanding environments.Package includes one air cylinder.Compatible OEM codes include 12100-KSE-670, 12100-KSE-671, and 12100-KSE-672.