Wiseco PK1366 Honda CRF450X 96mm 12:1 CR Piston Top End Kit

The Wiseco PK1366 is a complete top end piston kit engineered for the Honda CRF450X (2005–2009), featuring a 96mm bore (4820M) and a 12:1 compression ratio. Wiseco's piston kits are a trusted choice among competitive and recreational riders who demand precision-engineered components that meet or exceed OEM standards.

This kit is built around a dedicated forging using aerospace-grade aluminum alloy, delivering an exceptional strength-to-weight ratio. Each piston is CNC machined with an optimal cam shape and profile to maximize horsepower output and extend service life.

Kit Includes:

• Forged piston – Aerospace alloy construction with race-proven design, CNC machined for precise fit and optimal performance
• High-performance ring set – Engineered for extended service life and sustained power delivery
• Alloy wrist pin – Precision machined for consistent trueness, durability, and reduced friction
• Premium top end needle bearing – Highest quality materials for strength and smooth operation
• Wiseco top end gasket kit – Premium materials exceed OEM sealing standards

Key Specifications:

• Bore Size: 96mm (4820M)
• Compression Ratio: 12:1
• Application: Honda CRF450X 2005–2009
• Part Number: PK1366

Wiseco top end kits are the preferred choice of professional race teams across all disciplines of motorsport. Each component is manufactured to exacting tolerances, ensuring a reliable, high-performance rebuild that restores or improves upon factory power output.