S&S Cycle 320-0475 Flywheel Assembly Stroke Engine Crankshaft - 3-Piece 4-5/8

The S&S Cycle 3-Piece Flywheel Assembly represents a substantial upgrade over stock Harley-Davidson flywheels, engineered to maintain true alignment even under heavy load conditions. Designed for use in S&S 124" big bore engine builds, this precision-machined flywheel assembly delivers superior strength and reliability.

Key Features:

• Heat-treated 4140 chromoly steel construction provides 114% greater strength than stock flywheels
• 4-5/8" stroke configuration for increased displacement and torque
• Larger 1.671" diameter crankpin with increased cross-sectional area for enhanced clamping force
• Integral mainshafts eliminate welding requirements and reduce vibration
• Precision-balanced design ensures truer flywheel rotation and smoother engine operation
• Eliminates thrust washer for improved durability and simplified assembly
• Supplied without sprocket bearing race for builder flexibility

Important Installation Notes:

• Strokes longer than stock require S&S piston oiler set #31-2026
• Compatible with 2007-up engines using stock 7.659" rod length
• Stock pistons in 2007 and later engines require connecting rods with tapered wristpin ends

This flywheel assembly is designed for serious engine builders seeking maximum performance and reliability from their S&S big bore conversions. The superior material properties and precision engineering ensure long-lasting performance in high-stress applications.