Zongshen CG250cc engine 72.5mm Big Bore KitOPEN BOX ITEM READ DESCRIPTION

  
This item is an open box item. It has all the parts for the kit and has never been used or installed. It has simply been opened. We will respond within 24 hours, although response time is generally within an hour. Zongshen 250cc engine 72.5mm Big Bore Kit is a product designed to enhance the performance of motorcycles and scooters from various brands such as Hawk, XPRO, TaoTao, Apollo, and SSR etc. The kit includes a larger piston and cylinder to increase the engine displacement, resulting in improved power and torque. This product is specifically designed for Zongshen or similar CG250 brand engines and is compatible with various models. You can expect a substantial gain in bottom end torque, and around 5-10mph top end (this varies greatly depending on rider weight and specifically with what other mods you have). This is a complete top end Big Bore rebuild kit, with 72.5mm piston, piston rings, pin clips (Circlips), 16mm wrist pin, valve stem oil seals, exhaust and head gaskets. Some newer model CG250 engines may have a smaller crank case bore diameter than previous models, requiring minimal machine work. Turning the cylinder sleeve down to 75mm and/or opening/cleaning up the engine case diameter. However, the bottom end gain is well worth it, especially if you are looking for big torque gain. This kit has a 16mm wrist pin. Although rare, some CG250 models have a 15mm or 17mm pin.