Motorcycle Engine Part 66mm Air Cylinder Block For CRF150R CRF150RB CRF150 12100-KSE-670 12100-KSE-671 The 66mm air cylinder block is designed as a direct replacement for models CRF150R, CRF150RB, and CRF150 from 2007 to 2023.Constructed from aluminium , the cylinder block offers a lightweight design while supporting engine durability and performance.The part is manufactured under ISO9001 certification, adherence to consistent quality standards.Its direct substitution design allows for straightforward installation without modifications, maintaining compatibility across specified model years.The material is rated to withstand operating temperatures up to 105℃, making it suitable for demanding riding conditions.This cylinder block supports efficient engine and is engineered to meet specifications for fit and function.