42.5mm Cylinder Intake Manifold Crankshaft Engine For Stihl 023 025 MS230 MS250 34540122Introduction: A cylinder is where the piston and vales essentially "live". It's a cylindrical chamber that seats the piston. The piston is what is used to create the power of the engine. The valves open and close depending on what cycle the cylinder is on. On the intake stroke, the intake valve opens to allow air and fuel to be drawn into the cylinder. Feature: Condition: Brand New Warranty: 2 Year Specification ReplacesPart Numbers: 11230201209,