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Motorbike parts and tools

Engine parts & cables

Upper engine

Piston kit Prox forged

Non-contractual photo

Prox forged Piston kitRef : PRO00455A / 1129320002

Recommended retail price:235,06 €?

211,50 ^€

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Description
Compatible motorbikes
Questions and answers

DescriptionProx forged Piston kit

Product details :

Features

PROX Forged Piston — manufacturer reference 01.7365.B. Designed for the motocross world, this forged aluminum piston is aimed at engine preparations and rebuilds where strength and resistance to thermomechanical stresses are essential. Its design retains original dimensions to allow for a reconditioning equivalent to the factory specifications.

Diameter: Ø 87.970 mm (87.970 mm)
Compression: standard
Oversize: letter B (oversize B)
Specificity: flat piston top with cavity (flat with hollow)
Material: forged aluminum

Designed for enduro riders and motocross pilots, this piston withstands the demands of the terrain while remaining compatible with original dimensions. The "flat with hollow" configuration facilitates combustion timing and adaptation to the specific cylinder heads of the listed models. It should be paired with rings and pins that meet the recommended tolerances during reassembly.

Main compatibilities: BETA RR 390 4T RACING (2024), BETA RR 390 4T (2024), and BETA RR 390 4T ENDURO (2015). Always check engine dimensions and manufacturer recommendations before installation.

Technical information :

Reference

PRO00455A / 1129320002

Oversize

+0.01

Compression Ratio

12.5:1

Diameter Ø (mm)

87.970

Engine

Piston diameter

Ø 87,970 mm