JE Pistons 221771S FSR Forged Piston Kit 94mm Bore 11.5:1 Compression

The JE Pistons 221771S is a high-performance FSR (Forged Side Relief) piston kit designed for Honda motorcycle and ATV applications. This single-cylinder kit features a 94.00mm bore diameter and delivers an 11.5:1 compression ratio, making it ideal for riders seeking enhanced power and durability in demanding performance conditions.

Key Features:

• Forged from premium 2618-T6 aluminum alloy for exceptional tensile strength and reliability under extreme conditions
• Proprietary FSR asymmetrical forging design reduces friction and power loss while minimizing weight
• Precision CNC-machined ring grooves ensure optimal sealing and performance
• Smooth radius dome design promotes efficient combustion and flame travel
• Factory-honed pin bores with wrist pins and wire locks included
• Machined oil drain-back holes engineered for precise oil control
• Radiused valve reliefs prevent valve-to-piston contact
• Crown requires no deburring or preparation for installation

Engineered, forged, and machined entirely in the USA, JE Pistons represent over 75 years of racing expertise. The FSR design features an asymmetrical skirt that provides a more rigid and durable platform while reducing reciprocating mass. This piston kit is trusted by professionals across motocross, dirt track racing, and high-performance street applications where durability and power output are critical.