Cylinder Works Big Bore Cylinder Kit Cylinder-piston kitRef : CYW00072A / 1117544

The CYLINDER WORKS Standard Bore kit (manufacturer part number: CW21014K01) brings together the essential elements to restore or prepare the heart of your dirt bike engine. Designed to offer a good balance of performance and reliability, this set combines a Cylinder Works cylinder with a Vertex piston and Cylinder Works top-end gaskets for a clean and durable reassembly.

• Contents: Vertex piston – Cylinder Works cylinder – Cylinder Works top-end gaskets
• Type: Standard Bore, intended for competition preparations or high-end refurbishment
• Piston Compression: High compression
• Diameter (bore): Ø 99 mm
• Material: Aluminum

This kit is aimed at motocross riders looking for a quality replacement part to restore the optimal performance of the cylinder-piston assembly. The aluminum ensures a weight/thermal conductivity balance suitable for off-road demands, and the high compression of the piston is designed to support a performance-oriented engine configuration while maintaining the reliability of the supplied components.

Common compatibilities: FANTIC XEF 450 (2024), YAMAHA WR 450 F (2023), YAMAHA YZ 450 F (2022). Installation is recommended by a qualified mechanic with tolerance checks and break-in according to manufacturer guidelines.