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Dedicated forging Superior strength/weight ratio utilizing Aerospace alloy Race proven designs Chosen by top race teams, in all forms of racing CNC machined Optimal cam shape profile for peak HP and service life Precision machined, highest quality materials for strength and reduced friction High-performance ring set Extended life and sustained power Highest quality, alloy pin Consistently true and durable Note: All kits cover a single cylinder only All Wiseco 2-stroke top end kits include 1 piston, 1 ring set, 1 wristpin, 2 circlips, top-end bearings and gaskets Wiseco top end kits are sold by application and bore size. To ensure you receive the correct kit for your application, you must know the standard bore size to make sure you are ordering either the standard or correct amount of oversize that you need. If you have any questions, please email us. Wiseco Part#: PK1137 Product Type: Piston Kits Specifications: Bore - Standard: 54.00mm Bore - Oversize: STD Displacement: 123cc Bore - Actual: 54.00mm Note: Pro-Lite Stroke: 54.00mm Item Contents: 2126CS - 54.00 MM RING SET 641M05400 - SUZ RM125 89-99 PRO-LITE 2126CS B1013 - TOP END BEARING 15 X 19 X 19.5mm CW15 - ROUND WIRE PIN LOCKS 15MM (PAIR) S467 - PIN-15 x 41mm -UNCHROMED W6385 - Gasket Kit - Suz. RM125 '97-03