Wiseco PK1427 Piston Kit Honda CRF150R 66mm 11.7:1 Compression Top End Kit

The Wiseco PK1427 is a complete top end piston kit designed for the 2007–2009 Honda CRF150R. This kit features a dedicated forged piston (forging #4915) with a 66.00mm bore and an 11.7:1 compression ratio, engineered to deliver maximum power and long-term reliability for motocross and off-road racing applications.

Wiseco pistons are manufactured from high-strength aerospace-grade aluminum alloy, offering an optimal strength-to-weight ratio that outperforms cast alternatives. Each piston is CNC machined to precise tolerances with an optimized cam profile for consistent ring seal, peak horsepower, and extended service life.

Kit Includes:

• Forged piston — Dedicated forging in aerospace alloy for superior strength and reduced reciprocating weight
• High-performance ring set — Precision-fit rings for extended service life and sustained power output
• Alloy wrist pin — Precision machined for consistent fit, strength, and durability
• Premium top end needle bearing — High-quality bearing for reduced friction and long service life
• Top end gasket kit — Premium materials exceeding OEM sealing standards

Specifications:

• Bore Size: 66.00mm
• Compression Ratio: 11.7:1
• Wiseco Forging: 4915
• Application: 2007–2009 Honda CRF150R

Trusted by top race teams across all forms of off-road and motocross competition, Wiseco top end kits are a direct upgrade over OEM components and a go-to choice for riders demanding race-proven performance and reliability.