The Cylinder Works +3mm Big Bore Complete Cylinder Kit is a performance-enhancing solution for Honda CRF450X models, increasing displacement to 478cc. This ready-to-install kit offers OEM-like fitment and quality without the need for replating or additional machining.

Features:

• Increases displacement to 478cc with a +3mm big bore cylinder.
• Nickel Silicon Carbide plating ensures durability and long service life.
• Precisely honed for easy piston installation.
• Complete kit includes all necessary components for a top-end rebuild.
• Compatible with Hot Rods #4170 crankshaft to achieve 500cc displacement.

Included Components:

• Cylinder
• Piston kit
• Top-end gasket kit

Specifications:

• Displacement: 478cc
• Compression ratio: 12.1:1
• Piston type: Vertex #23595

Cross-Reference OEM Part Numbers:

• HONDA: 12100-MEY-670

Vehicle Fitments:

• Honda CRF450X: 2005–2017