Athena Cylinder - Ø40mm Cylinder-piston kitRef : ATH00006A / 1013414

The ATHENA Ø40mm cylinder kit (manufacturer reference 073700) is aimed at riders who are preparing or maintaining urban 50 cm³ engines. Designed to replace or enhance the central element of the thermal group, this kit provides the essential components for a complete overhaul of the top-end and facilitates mechanical preparation operations on scooters and small displacement bikes.

• Aluminum cylinder with a nickel-carbide treatment for a durable bore surface.
• Optimized cooling circuit design for better thermal management.
• Exhaust valves suitable for high-performance versions.
• Partially bronze cylinder head depending on references, for good mechanical strength.
• Forged piston with skirts treated with molybdenum disulfide to reduce friction.

The kit comes complete: piston, rings, pin, circlips, and gasket set; some references also include the cylinder head and exhaust valves. Spare parts available: piston 9469DA, rings 264301, top-end gaskets 604058.

Particularly suitable for urban use and 50 cm³ engines. Examples of commonly compatible models: YAMAHA AEROX R (SA421) 2018, MBK NITRO NAKED 2017, and BETA ARK 50 LC FACTORY 2013 — check compatibility before installation. A serious choice for those seeking reliability, ease of maintenance, and components suited for engine preparation.