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.
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