YX140 BIG BORE KIT 145CC TB PARTS - TBW9066 - PIT BIKE RACING - 57MM PISTON
TB YX140BIG BORE KIT 145CC - TBW9066. IF USING THIS KIT WITH TB V2 HEAD THEN YOU MUST USE GASKET SET - TBW0862. This kit is a 57mm barrel and high comp piston taking your cc up to 145cc. Standard size is 56mm for 140cc.