Athena (S4F08000004B) 79.96mm 13.5:1 Compression Forged Piston Kit Fits: KTM EXC 250F 2012-2013, XC-F 250 2007-2012, XCF-W 250 2007-2013; SX250F 2011-2012 Specifications: Big Bore-79.96mm (B), 13.5:1 Compression Forged Piston Kit Athena developed their forged pistons specifically for use in the off-road/ATV market and manufactured them using a revolutionary computerized technology originating from GP and F1 racing Athena forged pistons offer the best solution in terms of performance and reliability thanks to redesigned squish areas, modified compression characteristics and advanced surface treatments Piston is sold complete with rings, wrist pins and circlips