I have a 143cc light bore kit for sale (3 available). This is the best overbore size for your OE cylinder. Kit includes piston, piston pin, 2 clips, ring set, 120cc fuel injector and double valve spring kit (2 inner and 2 outer springs and lighter than stock valve retainer) OE head and base gasket included....$300 shipped to lower 48!!!!
Please pm for more information,