If your cylinder blows through, the compression is too low, or even a piston seizure has occurred, then this kit is exactly the right thing . Kit includes cylinder, piston, rings, pin, clips & top end gasket kit (you get exactly what is pictured). Piston is anodized for superior heat resistance and longer lifespan. The gaskets use performance materials to increase durability and provide greater reliability. Includes all gaskets pictured to rebuild top end. Kit is for standard bore size - 52.4mm x 57.9mm stroke, 12mm steel piston pin. Compression Ratio: 9.0:1. Condition: Displacement: 125cc Bore Type: Standard Bore Bore diameter: STD 52.4mm Stroke: 57.9mm Pin diameter: 22mm Replacement Part Number: Cylinder: 12100--901 Cylinder Base Gasket: 12191--900, 12191--901 Cylinder Head Gasket: 12251--901 Piston (Std): 13101--900 Pin, Piston: 13111-KWS-900 Piston Ring Set (Std): 13011--900 Circlips, piston: 13115-KWS-900 Valve stem seal: 12209--682 Fits Models: Fit for CRF125F 2014-2023 Fit for CRF125FB 2014-2023 Color: Silver Material: Metal Package Contents: 1set * Cylinder Piston Ring Gasket Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.