BWS50 2JA Racing Engine 70cc Big Bore Piston 47mm Crankshaft +2mm Long Stroke 41mm Tuning Transmission Bws 50 Full Complete Kit|Engines| - AliExpress
Amazon.com: TOP NOTCH PARTS PISTON CYLINDER HEAD PISTON GASKETS TOP END KIT SET FITS YAMAHA ZUMA YW50 YW 50 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 : Automotive
48mm Cylinder Piston Cylinder Head Gasket Kit For Yamaha BWS/ZUMA 50 7723050666622 | eBay