Takegawa 156cc S Stage bore kit for the Yamaha Cygnus X and BWs 125 FI is now available in a high compression version including the same 156cc cylinder kit as the original, but replaces the flat top piston with a new 13.6:1 domed piston. Higher compression adds mid range and top end power. Also available with Takegawa roller rockers and higher profile camshaft. (Kit with rockers shown)