S&S Cycle Stroke Flywheel Assembly 4 5/8" Stroke (SE 120R) - 320-0523

Features:

• Vast improvement over stock flywheels which shift out of true under heavy load
• Heat treated 4140 material is 114% stronger than stock, eliminates thrust washer
• Larger 1.671" crankpin, increased cross-sectional area for increased crank-pin clamping force
• No welding required
• Integral mainshafts, truer flywheels and less vibration
• Notes: Strokes longer than stock will require S&S piston oiler set #31-2026. 07-up stock rod length is 7.659"
• Stock pistons in 2007 and later engines require rods with tapered wristpin ends

Installation Instructions (1.64 MB)