JE Pistons 317223 High Compression Piston Kit 90mm Bore 11.5:1 CR

The JE Pistons 317223 is a premium forged piston kit designed for Aprilia Mana 850 and John Deere RSX850i applications. This high-compression kit features a 90.00mm bore size (+2mm oversize) and delivers an aggressive 11.5:1 compression ratio, resulting in 878cc end displacement for maximum performance.

Key Specifications:

• Bore Size: 90.00mm (+2mm oversize)
• Compression Ratio: 11.5:1 high compression
• End Displacement: 878cc
• Piston Weight: 302 grams
• Skirt Style: FSR (Forged Side Relief)
• Material: 2618 T6 high tensile forged aluminum
• Configuration: 2-cylinder set

Premium Features:

• Machined from aerospace-grade 2618 T6 forged aluminum for exceptional strength and heat resistance
• Dome features smooth flowing radii requiring no deburring or preparation
• Complete kit includes pistons, wrist pins (866-063-MW), pin locks, and piston rings (XC9000)
• Engineered specifically for extreme applications including professional competition
• Precision CNC-machined to exacting tolerances
• Designed and manufactured in the USA

Important Note: This big bore kit requires cylinder boring and replating for proper installation. JE Pistons has over 60 years of experience manufacturing high-performance forged pistons trusted by professional engine builders and racers worldwide.