Install the Pistion & Cylinder from a Yamaha Zuma Bws Cygnus 125 Scooter part 3/4 - YouTube
Amazon.com: Motoforti Racing Scooter Cylinder Big Bore Kit with 10mm Piston Pin for Yamaha Jog Zuma 2 Stroke 50cc for Minarelli 1E40QMB Engine 70cc : Automotive