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PERFORMANCE MOTORCYCLE PARTS AND KITS FOR AMERICAN V-TWINS

S&S Cycle logo

3 Piece Flywheels for 1999-2013 Big Twin Models

You've Got To Be Strong... To Go Fast

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As the performance of an engine is increased, eventually a weak link is found and something fails. One such weak link is the stock flywheel assembly in 1999-to present Harley-Davidson® big twins. If you really put the hammer down, the stock wheels tend to shift out of true. These assemblies are all new, with integral sprocket and pinion shafts, an all new connecting rod and crankpin, and superior materials for added strength. They are a vast improvement over stock, and are even superior to S&S flywheels to date.

FITMENT

  • 1999-’13 Harley-Davidson® big twins – Balanced and unbalanced models
  • S&S T-Series Engine and Hot Set Up Kit® replacement flywheels

FEATURES AND BENEFITS

  • 320-0459.jpgHeat-treated 4140 material is harder and 114% stronger than stock
  • Harder material, eliminates thrust washer
  • Larger 1.671” diameter crankpin 
  • Designed with increased cross-sectional area for increased crank-pin clamping force – No welding required!
  • Integral mainshafts – Eliminates two potential points of weakness
  • Consistent balance and precision machining – Truer flywheels and less vibration
  • Reduced mainshaft deflection at high rpm – less vibration, reduced piston and rod side thrusting, prevents oil pump damage, fully compatible with gear drive cams
  • Capable of higher rpm – More available power!
  • Trued to with in .0005” TIR 
  • Rod Bearings have 20 rollers vs 18 stock

Flywheel Assemblies for 2007-2014 Harley-Davidson® Big Twin Models

 Engine Displacement    Stroke    Rod WP End Style    Sprocket Bearing Race    Harley-Davidson®
 Twin Cam 96®, 103™
 Harley-Davidson® Twin Cam 96B™/103B™
 96, 103, 106 big bore, 110,
 117 w/S&S® Pistons  
 4 3/8"    Straight    Yes**  320-0350  320-0356
 No    320-0351    320-0357 
 96, 103, 110 w/Stock Pistons*    4 3/8"    Tapered*    Yes    320-0352    320-0358  
 No    320-0353    320-0359  
 S&S 106 Stroker    4 1/2"    Straight    No    320-0450    320-0456  
 S&S 111    4 1/8"    Straight    No    320-0407    320-0413  
 S&S 124    4 5/8"    Straight    No    320-0464    320-0471  
 SE 120R (uses 7.575" length rods)  4 5/8"  Straight   No  320-0523  320-0529
 Special Order    Specify    Specify    Specify    329-0002    329-0002  
*Stock pistons in 2007 and later engines require rods with tapered wristpin ends. Note - All S&S Flywheels for 2007 and later engines have stock 7.659" length connecting rods. **Flywheel assemblies supplied with sprocket shaft bearing race installed are compatible with stock roller style sprocket shaft bearings. Assemblies with no race require a Timken® sprocket shaft bearing.

 

S&S® Flywheel Assemblies for 1999-'06 Harley-Davidson® Big Twin Models

 Engine Displacement    Stroke    Sprocket Bearing Race    1999-2006 H-D® big twin models (except 2006 Dyna® models)   2006 H-D® Dyna® models
 TC 88®    TC 88B™  
 88, 95, 97, 100 w/Stock or S&S Pistons    4"    Yes*   320-0402    320-0396    320-0392  
 No    320-0403    320-0397    320-0393  
 96, 103, 106 big bore, 110, 117 w/Stock or S&S Pistons    4 3/8"    Yes*  320-0360    320-0354    320-0350  
 No    320-0361    320-0355    320-0351  
 S&S 106 Stroker    4 1/2"    No    320-0460    320-0454    320-0450  
 S&S 111    4 1/8"    No    320-0417    –   320-0407  
 S&S 124    4 5/8"    No    320-0475    320-0469    320-0464  
 SE 120R (uses 7.575" length rods)  4 5/8"  No  320-0525  320-0527  320-0523
 Special Order    Specify    Specify    329-0002    329-0002    329-0002  

Note - All S&S flywheel assemblies for 1999-'06 engines have connecting rods with stock 7.667" length and full width straight wristpin ends.*Flywheel assemblies supplied with sprocket shaft bearing race installed are compatible with stock roller style sprocket shaft bearings. Assemblies with no race require a Timken® sprocket shaft bearing

Special Order Forms can be found by clicking here.