50cc SYM and Peugeot 4-stroke 42mm Big Bore Cylinder Kit. Kit includes cylinder, piston, rings, piston pin, cir clips, head gasket, base gasket, exhaust gasket and cam chain tensioner gasket. This is a drop in cylinder kit, no crank case modifications required! When used in conjunction with a stock stroke of 46mm the total displacement comes out to 63.7cc. Fits the following 4-strokemodels: SYM Mio 50 SYM Fiddle II 50 SYM Orbit II 50 SYM Jet4 SYM Allo 50 SYM Cello 50 SYM Symphony 50 Lance Cabo 50 Lance Cali 50 Lance Havana 50 Lance PCH 50 Lance Soho 50 Peugeot Vivacity Peugeot Speedfight 3 Please see our Warranty Returns Policy.