Carrillo M9065 CP Forged Piston Kit Sea-Doo 300 100.25mm +.25mm OS 8.45:1 Turbo 1638cc

The CP-Carrillo M9065 is a high-performance forged piston kit engineered for the Sea-Doo 300 supercharged engine. Designed for the 2016 and newer RXP-X 300, RXT-X 300, and GTX Limited 300 platforms, this kit delivers the precision and durability demanded by serious PWC performance enthusiasts and racers.

This piston is machined to a 100.25mm bore (+.25mm oversize) with a 69.2mm stroke, yielding a displacement of 1638cc and a compression ratio of 8.45:1 — purpose-built for turbocharged and supercharged applications. Each piston is CNC-machined from a high-strength, lightweight 2618-T61 aluminum alloy forging, the preferred material for high cylinder pressure environments including boosted and nitrous applications.

Kit Includes:

• Forged 2618-T61 aluminum alloy piston
• Premium ring package
• Tool steel wrist pin (866-2250-20CP3C)
• Carbon steel wire locks (866X063SWL)
• Rings: SWF-20064-3

Key Specifications:

• Part Number: M9065
• Bore Size: 100.25mm (+.25mm oversize)
• Stroke: 69.2mm
• Displacement: 1638cc
• Compression Ratio: 8.45:1
• Cylinders: 3 (sold individually — one piston per kit)
• Compatible Rod: 9086

Key Features:

• CNC-machined from high-strength, lightweight forgings for optimal performance
• 2618-T61 alloy provides superior ductility and strength in high-boost applications
• Designed specifically for turbocharged and supercharged Sea-Doo 300 engines
• Includes premium ring package, tool steel wrist pin, and wire locks
• Manufactured in Irvine, California by CP-Carrillo — a trusted name in race engine components since 1961

CP-Carrillo has been producing race-grade pistons and connecting rods for over six decades. The M9065 reflects that legacy of precision engineering, making it the go-to upgrade for Sea-Doo 300 owners seeking maximum reliability in high-performance and racing builds. Sold individually — a complete set requires 3 pistons.