Wiseco K2774 HD TC 4.250 bore 131 cu in Piston KitWiseco K2774 HD TC 4. 250 bore 131 cu in Piston Kit V Twin performance has been around since some of the earliest days of motorcycle racing and engine modification, and Wiseco has been there since the beginning. Applying over 80 years of experience, Wiseco has fine tuned its V Twin pistons for each specific engine platform to optimize performance and durability. From reliable rebuilds to all out race, Wiseco has the pistons for your V Twin build.