Kit 80 cc Big Bore polini fit Kymco Agility Rs-Naked 2T with head Cylinder 80cc Racing- Kymco AC 2-stroke (casing intake) The cylinder kits are Nicasil plated alloy cylinder kits. The machinig is very good and the layout of the ports is very promising. The piston is made by Mahle and is a very high quality affair. Even if you are going to tune the kit further there will be no problems with the piston side. The port timings are very torquey. Fitted together with larger carb and racing pipe there will be a performance output of approx. 12 hp on a liquid cooled engine. The kit is predestinated for further tuning and porting. The self locating head and the high quality piston are the perfect ingredients for a real powerful engine, especially if it is if ported to get a nice exhaust duration.