4-5/8" Stroke Flywheel with Full Width Rods and balancer gear for M8 Models
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4-5/8" Stroke Flywheel with Full Width Rods and balancer gear for M8 Models

Item #: 320-0605
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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 trued to a spec others can only dream of, the new cranks for the Milwaukee-Eight® platform are the best of the best to build your high performance engine around.


  • 4-5/8" Stroke - Use S&S 131 Kits
  • Balance Gear installed
  • Heat Treated 4140 Material is harder & more than twice as strong as stock
  • Stronger assembly eliminates need to weld crankpin
  • Capable of higher RPM - More available power!
  • S&S High Strength Connecting Rods are designed with Finite Element Analysis to eliminate weak spots and handle more power!
  • Full width wristpin connecting rods (requires S&S Performance Pistons)
  • Balanced for S&S Performance piston weight (1213g)
  • Perfect for Gear Drive Cams
  • Consistent balance & precision machining
  • Capable of higher RPM – More available power!

Not recommended for Tri-Glide or other three wheel models including conversion due to lugging nature of these bikes.

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NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLE. Not legal for sale or use on any EPA pollution controlled motor vehicle.

Will not work with stock H-D pistons