90cc Big Bore Cylinder Kit (cast iron) for 50cc 2-Stroke Air-Cooled Minarelli Based Engines SPECIFICATIONS: Wrist Pin Diameter: 12mm Wrist Pin Length: 39.8mm Piston Diameter: 53mm Overall Height (cylinder): 102mm Includes: Head, Cylinder, Piston Set, Top End Gasket COMPATIBILITY: CPI – Aragon GP 50 2T, Hussar 50 2T >’03, Oliver 50 2T >’03, Popcorn 50 2T >’03 Explorer – Cracker 50 2T Diamo – Velocity 50 2T E-ton – Beamer 50 2T, Matrix 50 2T Keeway – F-ACT 50 2T, Matrix 50 2T, Hurricane (Euro) 50 2T, Flash 50 2T, Focus 50 2T, Hacker 50 2T, Goccia 50 2T, Arn 50 2T Malaguti – F12 Phantom R 50 2T >’07 Qlink – Hawk 50 2T, Rave 50 2T, Star 50 2T TNG – LS 50 2T, SS 50 2T Vento – Triton 50 2T, Zip 50 2T This high performance 90cc big bore cylinder kit will work on most Yamaha, Vento, Malaguti Minarelli 50cc 2-stroke air-cooled based engines. You will need to bore out your engine in order to complete the installation. **NOTE: Please make sure that your scooter uses the 12mm wrist pin and not the 10mm that goes thru the piston. There is no refund or exchange on this item.