Brand new Polini 70cc big bore kit (47mm piston). Complete with the following: -cast iron cylinder w/47mm bore -aluminum cylinder head -piston -piston rings -wrist pin -c- clips -exhaust studs -Jets Designed but not limited to fit the following applications: Malaguti f12 R Aria (2007) Spinotto Vento 2-stroke models with 12mm wrist pin.