A new cylinder is not always the solution when the cylinder has several thousand mileage usage. Get the level of compression back up where it belongs by replacing piston rings or pistons instead of burdening yourself with major repairs. Our warehouse is full of original spare parts and tuning and replacement parts such as pistons, piston rings, CIR clips, piston pins and gasket sets. The main job of piston rings is to seal the combustion chamber against the piston housing and to channel the heat from piston to cylinder. Above this, the pistons are also there to adjust the lubrication family, an important function. This means that they are always at work under pressure, often suffer from wear and tear and should be replaced regularly. Lowered compression loss and poor start reaction are the exact description of worn piston rings. We offer piston rings up to 4. oversize (os) for many models and cylinders. The listed hole always shows the size of the cylinder. There are normal and L-shapes, with cylinders also tuning the trapezoid and half-trapezoid-shaped segments. SIP-TIP: Be careful when installing piston rings, do not over stretch, otherwise it may break. Pay attention to the piston rings stop play, type and model. Trapezoid rings have only one installation direction! The right equipment is of great help when working on cylinders: BU5045 piston ring pliers, Buzzetti pin installation / removal tool 15194000 and 17820000 spindle pin.