DescriptionVerify the part fits before purchasing Specs: Description: Top End Piston Kit Compression Ratio: STD Cylinder Bore: 39. 500 Piston Diam: 39. 470 Displacement: 50. 000 Notes: Top end piston kit includes: piston, rings, pins, circlips, top end gaskets, and wrist pin bearing when applicable. Fits: Husqvarna TC 50 2017-2019 KTM 50 SX 2009-2017