Takegawa R-Stage bore kits offer competitive performance while retaining affordability. Bolt on kits for the XR100R and CRF100F available in 4 separate displacements. 125cc and 136cc patented SCUT versions require no bottom end disassembly or case boring and install in as little as one hour. All R-Stage kits include all aluminum ceramic plated cylinder, molybdenum coated piston, R-Stage head with 27mm/23mm valvesand Sport camshaft. Even more performance is possible by simply installing the available SX25 or SX35 camshaft!