High performance Midrace 70cc aluminum cylinder kit Made in Italy by Athena. With the thermal advantages of aluminum provides these cylinders with better cooling and a higher peak power than cast-iron cylinder. Performance between 15-18 hp can reach. 19-21mm carburretor and racing exhaust like Yasuni C16, Stage6 R1200 or Polini for race4 are necessary to reach the maximum power. We recommen racing crankshaft with this cylinder kit. Supplied with piston and ring, cylinder head, carbon reeds and gasket set with various base gaskets to adjust the squish.