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Upper engine

Piston kit Vertex Forged - Oversize Cylinder

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Vertex Forged - Oversize Cylinder Piston kitRef : VER00291A / 1123349001

Recommended retail price:270,00 €?

256,50 ^€

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Description
Compatible motorbikes
Questions and answers

DescriptionVertex Forged - Oversize Cylinder Piston kit

Product details :

Features

FORGED PISTON KIT VERTEX designed for oversize cylinders: a technical solution aimed at motocross riders looking for a quality engine part for repair or preparation. This "Big Bore" kit incorporates VERTEX's expertise with a forged aluminum piston, machined to fit an enlarged bore.

Manufacturer reference: 24405A
Brand: VERTEX
Type: Forged piston for oversize cylinder
Bore diameter: 80.00 mm
Piston diameter: Ø 79.95 mm (letter oversize A)
Piston compression: Standard
Material: Forged aluminum

The forging process gives the piston a dense material structure, sought after for its ability to withstand the thermal and mechanical stresses inherent to off-road riding. This kit is suitable for reboring or replacement when moving to oversize A. It is particularly suitable for recent 250 cm³ motocross models:

YAMAHA YZ 250 F (2026)
FANTIC XXF 250 (2026)
YAMAHA WR 250 F (2026)

Installation and adjustments must comply with manufacturer specifications (piston/bore clearance, ring installation, break-in). This kit is intended for preparers and riders seeking an engine part compatible with an oversize cylinder.

Technical information :

Reference

VER00291A / 1123349001

Oversize

STD

Rings Quantity

Set

Compression Ratio

13,8:1

Diameter Ø (mm)

79,95

Bore size (mm)