Carrillo M1009 High-Performance Piston Kit for Yamaha YFZ450 98mm Big Bore

The CP-Carrillo M1009 is a premium big bore piston kit engineered specifically for 2004-2019 Yamaha YFZ450 and YFZ450R ATVs. This complete kit features a 98mm bore diameter (+3mm oversize) that increases displacement to 478cc, delivering significant power gains over stock configurations.

Key Specifications:

• Bore Size: 98mm (+3mm oversize)
• Compression Ratio: 12.5:1 (468cc models) / 12.75:1 (478cc models)
• Displacement: Increases engine to 478cc
• Forged aluminum construction for exceptional strength and minimal weight
• Designed for pump gas applications

What's Included:

• Forged CP piston
• High-performance piston rings
• Wrist pin
• Circlips
• CP-Carrillo stickers

Advanced Project X Pro Technology:

This piston incorporates CP-Carrillo's exclusive Project X Pro profiled pin bore technology, which uses specialized machining processes to create optimized shapes within the pin bore area. This advanced engineering significantly reduces stress in one of the piston's most critical zones, allowing the pin to flex naturally while improving durability and reliability at high RPMs.

The M1009 piston is precision-engineered for minimum weight while maintaining maximum strength, enabling higher engine speeds and improved acceleration. Compatible with various connecting rod options depending on your YFZ450 model year, this kit provides the foundation for serious performance builds.

Fits: 2004-2019 Yamaha YFZ450 and YFZ450R (requires cylinder boring to 98mm)