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S&S Cycle

S&S Cycle 4" Stroke Flywheel For Harley Twin Cam

Item: P921434

The flywheels are the heart of any performance engine and S&S Cycle has been perfecting the art for over six decades. Stronger, more durable, and true… Read More

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This product is legal in California only for racing vehicles which may never be used, registered or licensed for use upon a highway.

S&S 4" Stroke Flywheel For Harley Twin Cam

  • 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
  • Harder material, no thrust washers required, where stock flywheels have thrust washers
  • S&S flywheels have steel gripping the crankpin
  • No welding required
  • Integral mainshafts,consistent balance and precision machining, truer flywheels and less vibration, and eliminates two potential points of weakness
  • 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 which allows more available power
  • Includes sprocket bearing race

Made in the USA
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