Prox Complete cast rib A Piston kitRef : 244025DA / 1095347001

The PROX cast piston reference 01.2114.A is designed for motocross riders looking for an original part for 85 cm3 engines. Made from aluminum, this piston features a domed head and a Mos2 treated skirt, elements that promote regular lubrication and controlled interaction with the heavily used cylinder.

• Type : Cast piston (oversize A)
• Diameter : Ø 47.44 mm (47.440 mm)
• Compression : Standard
• Material : Aluminum
• Specifications : domed head, 2 lubrication holes on the exhaust side skirt, Mos2 skirt treatment

The presence of the two lubrication holes on the exhaust skirt helps ensure targeted oiling in the most stressed area, while the Mos2 treatment reduces friction at the piston/skirt interface. Its geometry will suit stock or near-standard setups where oversize A is required.

Practical compatibility: designed for YAMAHA YZ 85 models (notably LW BIG WHEELS 19/16 2026, YZ 85 2026, and YZ 85 CB09 2012). Always check the diameter and reference before installation to ensure compatibility with your engine's cylinder and rings.