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New Arrival — In Dealer Exclusive

Screamin' Eagle Stage IV Kit - 121CI to 135CI

$4,574.95
Part Number: 92500143
Color: Black Granite
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For the rider demanding no-compromise performance. With the largest displacement and the most power of any Harley-Davidson® Stage Kit, this 121ci to 135ci Stage IV Kit was engineered by the pros at Harley-Davidson to deliver instant arm-stretching torque through the entire rpm range. Made for riders seeking maximum displacement, compression, and flow, it delivers 144 horsepower and 149 ft-lb of torque to the rear wheel! This Stage IV Kit features the finest Screamin’ Eagle® components. Many of these new components were informed by extensive testing by the Harley-Davidson Factory Racing Team for the King of the Baggers racing series. The Stage IV kit consists of: All-new Screamin' Eagle® Extreme CNC-ported cylinder heads, 68mm throttle body and new cast 68mm intake manifold, new SE8-550 high-lift cam and 6.8 g/sec fuel injectors work together to feed the engine large volumes of air and fuel to help maximize power. New forged high-compression pistons and rings are designed to withstand increased combustion forces. Also includes high-performance tappets, new patent-protected 4.31" steel sleeve cylinders, and Screamin' Eagle® Pro Billet Cam Plate and Oil Pump. Screamin’ Eagle and Stage IV badging on the cylinder heads and timer cover highlights the powerplant.

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    • Question:
      6/30/2025
      What increased hp and torque numbers should one expect from this upgrade? The video says 144/149. Is this guaranteed? Please don’t ask me to ask my dealer.
      Douglas - Maine
      • Answer:
        Hello, Due to the nature of your question, please consult with your local dealership. Thanks
    • Question:
      4/2/2025
      Why do you tell everybody to call dealer for all the questions people ask from you?!?! Do your job and know your product!!!
      Mike - Phoenix az
      • Answer:
        Hello Mike, Screamin' Eagle Stage IV Kit - 121CI to 135CI is sold in store only. For some assistance, we recommend that you contact your local dealer for staff technicians. Thank blairmke
    • Question:
      3/5/2025
      Does this kit require an upgraded clutch or is the stock clutch sufficient under wide open throttle?
      • Answer:
        Hi Nixguy: Due to the nature of your question, please consult with your local dealership. Thanks
        princessv
        Helpful?
    • Question:
      2/5/2025
      The VVT system will not be retained; this is important to me as I am not a fan of the VVT tic-tic. will there be any remains of the VVT system after this upgrade is completed?
      ProStar209 - Clam Lake WI
      • Answer:
        No, the only thing that stays is the cam sensor. So there is 5lbs in weight savings.
        Frank Castle
        Helpful?
        • Answer:
          Hi ProStar209, The Screamin' Eagle Stage IV Kit - 121CI to 135CI is sold in store only. For assistance, we recommend that you contact your local dealer. Thank you
          QuickShift
          Helpful?
    • Question:
      1/23/2025
      What is compression ratio of this kit?
      Norm - Ellettsville,IN
      • Answer:
        Hello Norm. Please visit your local HD Dealer for technical assistance. Thanks blairmke Thanks blairmke

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