Pro-high compression big bore piston kit - diameter choice. Big bore piston kit ø 79.00 hc b - 23589b reference: 09102037 - 23589b brand: vertex. This product is compatible with.Honda cr-f 250 r 250cm3 (2010; 2011; 2012; 2013). The item \, connecting rods. \The seller is \This item can be shipped to the following countries: Europe.