JE Pistons 221781S FSR Forged Single Piston 95.00mm Bore 12.5:1 Compression

The JE Pistons 221781S is a high-performance FSR (Forged Side Relief) single piston engineered for demanding powersports applications. This forged racing piston features a 95.00mm standard bore diameter and 12.5:1 compression ratio, making it ideal for high-compression builds requiring exceptional strength and reliability.

Key Features:

• FSR (Forged Side Relief) strutted forging design for optimal weight savings and strength
• Forged from premium 2618 T6 high-tensile aluminum alloy for extreme durability
• 95.00mm standard bore diameter with 12.5:1 compression ratio
• Asymmetrical skirt design reduces weight while maintaining strength on loaded side
• Designed to withstand acceleration forces exceeding 8000 G's
• Smooth dome and dish profiles with flowing radii for excellent flame travel
• Compatible with aftermarket camshafts and high-performance builds

JE Pistons FSR technology utilizes an innovative asymmetrical skirt design that places material where it's needed most—on the thrust side that receives combustion loading—while reducing weight on the opposite side. This single piston is manufactured using JE's Critical Process Program with tight tolerances in 14 critical areas, and undergoes a rigorous 23-point quality inspection to ensure dimensional accuracy and performance reliability. Ideal for motorcycle, ATV, and powersports engine builds demanding professional-grade components.

Note: Piston rings, wrist pins, and locks sold separately. Verify bore size and compression ratio compatibility with your specific application before ordering.