JE Pistons 317220 Forged Piston Kit 88mm Bore 10.5:1 Compression Aprilia Mana John Deere RSX 850i

The JE Pistons 317220 is a complete high-performance forged piston kit designed for Aprilia Mana 850 motorcycles (2008-2013) and John Deere RSX 850i UTVs (2013 and newer). This 2-cylinder kit features an 88mm standard bore size with a 10.5:1 compression ratio, delivering enhanced performance for street and recreational applications.

Premium Construction and Features:

• Machined from 2618-T6 high tensile forged aluminum for superior strength and durability
• FSR (Forged Side Relief) skirt style for optimal weight reduction and thermal expansion control
• Smooth-flowing dome design with precision radii that requires no deburring or preparation
• Piston weight: 286 grams per piston for optimal performance
• 839cc displacement configuration
• Engineered specifically for extreme applications including professional competition

Complete Kit Includes:

• Two forged pistons with precision-machined crowns
• JE piston rings (Part Number XC8800)
• Wrist pins (Part Number 866-2050-15-51C)
• Wire-type circlips/pin locks (Part Number 866-063-MW)

Backed by over 70 years of JE Pistons' manufacturing excellence, this kit is designed, forged, and machined in-house in the USA. Professional engine builders, race teams, and performance enthusiasts trust JE Pistons for their precision engineering and proven reliability in high-stress motorsports environments.