Motorcycle Engine Part Air Cylinder Block Size: 76.80mm OEM Code: 12100-KRN-A60 Material: Aluminium Compatibility: Fits CRF250R models from 2010 to 2017 The motorcycle cylinder is a core component of the engine.It functions by burning a mist-like mixture of oil and air to push the internal piston in an up-and-down , converting chemical energy into mechanical energy to generate power.Produced with advanced materials, this cylinder offers a long service life and a low coefficient of friction.It delivers power across various riding conditions and contributes to a comfortable riding experience.ote: This is a third-party compatible part.Brand/model citations do not imply sponsorship or approval.