The motorcycle cylinder is the core of the engine.By burning the mist-like oil and air in it, it pushes the piston inside to move up and down, and converts chemical energy into mechanical energy to generate power. Produced by manufacturers, the motorcycle cylinders are made of advanced materials with long service life and low coefficient of friction, which can provide excellent power in a variety of riding conditions and provide a comfortable riding experience. Item Type: Cylinder Material Type: Aluminium Size: 77mm Fit for: 250cc models 2004–2008 Package includes: As shown in the image This is an aftermarket accessory.Brand names and model numbers are referenced strictly for compatibility information.