
PROX Piston Ring Set - Ø78mm 4T (Manufacturer part number: 02.6347): a set of rings designed for 4-stroke cross engines, intended for maintenance and top-end rebuilds.
PROX rings are machined from a specific alloy and calibrated to help reduce friction between the piston and cylinder, thereby limiting wear and preserving gas sealing. Ideal for piston rebuilds or preventive replacements, this set is aimed at riders performing top-end work on their cross machines.
Installation and practical advice: always replace the rings with a complete set and check the condition of the piston, cylinder, and ports before reassembly. Follow the manufacturer's specifications for clearances and break-in procedures to ensure good sealing and consistent piston operation.
Examples of compatible motorcycles (to be verified according to engine and size): GAS GAS MC 250 F FACTORY EDITION 2023, KTM 250 SX-F 2022, HUSQVARNA FC 250 2022. For any intervention, prioritize careful installation and appropriate tools to ensure the longevity of your top-end.