Prox forged Piston kitRef : PRO00456A / 1129320003

PROX Forged Piston — replacement part designed for 4T Cross and Enduro engines. Made from forged aluminum, this piston meets the needs for restoration for an equivalent fit to the original equipment. Its flat with hollow head and oversize specification C allow for a proper adjustment during a complete cylinder refurbishment.

• Manufacturer reference: 01.7365.C
• Diameter: Ø 87.980 mm (87.980 mm)
• Compression: standard
• Material: forged aluminum
• Specification: flat with hollow head (Flat with hollow)

Ideal for track sessions or trail outings, this piston integrates into engine refurbishment operations: checking the sleeve, replacing the rings, and ensuring the piston-sleeve clearance during installation. Its forged design provides a homogeneous structure suitable for the usual mechanical stresses of motocross, without promising unverified performance improvements.

Main applications: compatible with BETA RR 390 4T (2024) Racing and standard models, as well as BETA RR 390 4T Enduro (2015). Before installation, check the exact compatibility with your engine and follow the manufacturer's recommendations for break-in and torque settings.