Athena cylinder kit For over 10 years Athena has invested in the best and most modern technologies for the production of cylinders and their components, which are not only used by original equipment manufacturers, but also the best racing teams around the world. The production of aluminum cylinders is last but not least continuously improved thanks to the collaboration with the best Italian universities and further permanent development demands the best engine tuner. Due to a flexible production department, Athena can respond effectively to different situations (production batches of OE manufacturers, small quantities, building a prototype for racing teams). Athena cylinders are made of high quality aluminum alloy. They are made taking into account the latest technologies and coated with a nickel-silicon alloy. After all cylinders have passed rigorous quality control to meet the highest standards in reliability, durability and performance. Technical details: Cylinder material: Aluminum Bore: 77 mm Stroke: 53.6 mm Displacement: 249.6 cc Compression ratio: 12.6:1 Cylinder head: not included Max power at the shaft: 31.9 HP / 10,800 rpm