The ATHENA Ø77mm cylinder kit is designed for cross machines based on the Yamaha 250. Made from aluminum and treated for longevity, it is aimed at riders looking to replace or upgrade their engine block with high-quality original parts.
- Manufacturer reference: P400485100072
- Compatibility: Yamaha YZ250F (2019-) / WR250F (2020-2021)
- Diameter: Ø 77 mm
- Material: Aluminum
Characterized by a nickel-carbide treated aluminum cylinder, this kit incorporates technical solutions aimed at improving durability and performance on the track or cross paths: design promoting a larger coolant volume, high-performance exhaust valves, and a bronze cylinder head dome. The piston is forged, and its skirts feature a molybdenum disulfide coating to reduce friction.
Delivered complete, the kit includes piston, rings, circlips, pin, and gasket set; depending on the variants, it may include the cylinder head and exhaust valves. Spare parts (pistons, rings, gaskets) are available separately for maintenance or preparation needs.
Field: Cross — ideal for preparations and replacements in demanding terrains.
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