ATHENA Big Bore Cylinder Kit 072900/1 70cc

The Big Bore 70cc cylinder kit represents excellence in the world of motorcycle performance, designed for those who wish to enhance their vehicle with a high-precision component. Made from high-quality aluminum, this cylinder is the result of advanced technologies and a manufacturing process that ensures millimeter tolerances at every stage of production.

Thanks to an innovative design, the cylinder features a bore of 47 mm and a stroke of 37.4 mm, allowing it to achieve a displacement of 64.85 cc. The shape of the piston crown is flat, optimizing combustion and the overall performance of the engine. With a piston pin diameter of 10 mm and a total of 5 transfer ports, this kit is designed to maximize airflow efficiency and cooling.

Air cooling is ensured by redesigned channels that increase heat dissipation capacity, while the cylinder liners are made from a special blend of silicon carbide and nickel, ensuring exceptional durability. Each cylinder is tested at an internal temperature of around 20 degrees for optimal control of bore sizes and tolerances.

The surfaces of the cylinder are perfectly flat, eliminating any mating inaccuracies and ensuring perfect integration with the engine. With a single chrome-plated elastic ring of 1.2 mm thickness, this kit is designed to deliver high performance and long-lasting durability, making it the ideal choice for motorcyclists seeking the best from their vehicle.