Cylinder d.63mm Top Performances 183cc Yamaha Xmax 125cc.Perfect kit to repair and/or increase the performance of your maxiscooter.Including: Aluminium cylinder, 63mm bore Piston + rings All necessary gaskets Jet set Keihin The larger bore (63 mm) increases displacement without requiring major conversions. Specifically, this means an increase from the original 125cc to 183cc, which brings a significant boost in torque and top speed. The cylinder head is NOT included, please use original head. For Yamaha / MBK 125cc 4-stroke / 4V with carburetor. ΣυμβατότηταFlame X 125cc 2004 - 2006 Cygnus X 125cc 2004 - 2007