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Screamin' Eagle Milwaukee-Eight Engine Stage IV Kit - 107CI to 128CI

$3,974.95
Part Number: 92500077
Color: Black Highlighted
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This Stage IV Kit was designed to deliver maximum horsepower – all the way to the redline. Features new CNC-ported heads with 1mm bigger valves and fully machined combustion chambers. Coupled with the kit's high-lift SE8-517 cam, high compression pistons and a 64mm throttle body and intake manifold, this combination delivers a thrilling 126 ft-lb of torque and 121 HP rear-wheel output when paired with Screamin' Eagle Street Cannon Mufflers. It’s designed to run wide open at high-end RPMs and provide a significant boost of torque from cruising speed. You’ll feel the difference as soon as you twist the throttle. When installed by an authorized Harley-Davidson Dealer within 60 days of the vehicle purchase, compliant kits do not impact the vehicle’s limited warranty. Kit includes: CNC Ported Cylinder Heads with CNC machined chamber and 1mm larger valves L93, Stage IV Timer Cover, SE8-517 High-Lift Cam, Forged High Compression Pistons, High Performance Cam Bearing, Tappets, 4.31" Steel Sleeve Cylinders, 64mm Throttle Body and Cast Manifold and High Flow Injectors (5.5 g/sec).

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    Q&A
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    • Question:
      12/21/2023
      Do I need to do machine work to the bottom end
      No name - Ventura
      • Answer:
        Hello, We recommend you work with your local Harley Davidson dealer with any installation problems/questions. Thanks blairmke
    • Question:
      1/14/2022
      Does this fit my bike if I already upgraded from a 107 to 114 stage four
      Dblplay - Yakima
      • Answer:
        Hello Dblplay, Yes, this kit will fit and take you to the next level of performance. However, make sure to check the fitment details and year/model to be sure your bike is listed. Thanks, shvlhd
    • Question:
      2/14/2020
      I was told can put the 128 kit upgrade to my 107 on my 2018 tri glide ultra is that correct
      bigmike53 - port saint lucie fl
      • Answer:
        Hello bigmike53, Per the Fitment tab on the product page, Does not fit Trike models. Thanks H9FXE
    • Question:
      1/26/2020
      The 128 Stage IV kit appears under the search for my 2018 FXBB Street Bob, but list only touring bikes under the fitment tab. Will it work with my bike? Thanks
      Autotech76 - Leesburg Ga

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    Screamin' Eagle Milwaukee-Eight Engine Stage IV Kit - 107CI to 128CI