MotoCult has done it, we made a 70mm big bore kit for your air cooled CG250 engine. This will fit all CG250 engines like the ones that come on the Hawk 250 RPS and DLX, Tao Tao 250, CSC TT250, CSC SG250, Brozz 250, etc. This is the highest quality big bore kit available.MotoCult has done all the machining for you so you'll have the perfect increase in compression and the cylinder bolts on without any modifications needed. This piston and cylinder package will add 21cc (almost 10%) more displacement to your 229cc stock engine. Not only does this kit offer more cc's it also substantially increases the compression resulting in MORE POWER! The piston has a 16mm wrist pin. The 250cc Power Cylinder comes with. 16mm length location dowels x2. Stainless steel riser plate for the rocker box, you'll need this since the cylinder has been decked. This riser helps maintain the factory geometry of the push rods and reduces the stress placed on them. It also keeps the tappets in the factory position.