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

$3,799.95
5.00
|
See 5 reviews
Part Number: 92500094
Color: Black Highlighted
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Go big or go home. With the largest displacement of any Harley-Davidson Stage Kit, this 107CI to 128CI Stage IV Kit is designed to deliver maximum horsepower – all the way to the redline. Packaged with patent-protected cylinder technology, it allows for the largest bolt-on engine upgrade to any Milwaukee-Eight motor. Features new CNC-ported heads with 1mm bigger valves and fully machined combustion chambers. 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.

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Description
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Rating Snapshot
5
5
4
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Quality
Did Not Meet
Exceeded
Showing 1-5 of 5
Reviews
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  • FEATURED REVIEW
    6/22/2025
    Unbelievable power with this Stage IV kit
    Featured H-D Dealership H-D Employee Sweepstakes Entry Verified Purchaser Top 10 Contributor Top 25 Contributor Top 50 Contributor Top 100 Contributor Top 250 Contributor
    Quality
    Did Not Meet
    Exceeded
    My ‘19 Lowrider was pretty nice out of the dealer showroom, but transformed into a monster performer with this Stage IV upgrade to my 107 original engine. It is like night and day. Performance is crazy sweet. Dealership did the install over the winter and tuned it before I picked it up in the Spring. Not that I really care about mpg, but if you’re curious, I can still get in the low 40’s on the open road. I can’t say enough about how sweet this upgrade is. read more.
    • User review image
    Blueknight - New York
  • FEATURED REVIEW
    4/21/2022
    146 HP
    Featured H-D Dealership H-D Employee Sweepstakes Entry Verified Purchaser Top 10 Contributor Top 25 Contributor Top 50 Contributor Top 100 Contributor Top 250 Contributor
    great bit of kit..... installed on 2018 sportglide with a Woods WM8-408 cam
    Toby - Perth - Australia - Motorcycle: FLSB
    • What are you whining about? The performance graph only advertises 126-127TQ and 124HP. NOT the 146/153 you're crying about.
      Old and Ugly - Montana
      2/21/2025
    • HD have edited my review, still 5 stars but be aware you will not achieve any where near 146HP or 153TQ without the use of several non HD branded accesories
      Toby - Perth - Australia
      5/22/2022
  • FEATURED REVIEW
    4/6/2021
    Wow!
    This upgrade is bar none the best the MoCo has put out in it's history of manufacturing.
    NC Tumblwd - Winterville, NC - Motorcycle: '18 FLSB Stage IV
  • FEATURED REVIEW
    2/22/2021
    Holy Crap
    Featured H-D Dealership H-D Employee Sweepstakes Entry Verified Purchaser Top 10 Contributor Top 25 Contributor Top 50 Contributor Top 100 Contributor Top 250 Contributor
    Put this think on my 2020 Softail Slim and it is like the ACME rocket Wile E Coyote straps himself on in the Roadrunner Cartoon!
    Tommygun - Fort Lauderdale - Motorcycle: Several
    • Be careful, it's didn't end well for the coyote! Lol
      They Call me Lugo - Ontario, CA
      3/14/2021
  • FEATURED REVIEW
    12/13/2020
    Very happy
    Featured H-D Dealership H-D Employee Sweepstakes Entry Verified Purchaser Top 10 Contributor Top 25 Contributor Top 50 Contributor Top 100 Contributor Top 250 Contributor
    First dynotune gave me 125 hp and 135 ft/lbs torque, HUGE improvement over stock!!
    Harley rider - Salem, OR - Motorcycle: 2018 Sport Glide
    • Curious what the install cost was? Did you have your Harley dealer do it?
      Curt - Vermont
      6/22/2024
Showing 1-5 of 9
Q&A
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  • Question:
    8/3/2024
    What size camshaft comes with kit? What lift and duration?
    Ferris - Fl
    • Answer:
      This specific 128ci Stage IV kit comes with an SE8-517 camshaft. The lift at the valve is .515/.513" for Intake/Exhaust. Duration is 227/242 for Intake/Exhaust.
      SE Performance
      Helpful?
  • Question:
    6/29/2022
    Are these stage kits for the Milwaukee 8 engines CARB compliant yet?
    JJ1979 - Visalia
    • Answer:
      Hello JJ1979, Some kits are depending on what year and model the bike is. Gigglesthehelper
      Gigglesthehelper
      Helpful?
  • Question:
    6/28/2022
    How does this kit even work? A 107ci has a 4.375" stroke and the 114ci has a 4.5" stroke. Doesn't the 107ci need to be stroked or have the case bored to go bigger than 124ci?
    Timothy - Clarksville TN
    • Answer:
      Timothy, The cases do not need to be bored to install this kit, 4.375 stroke with 4.310 pistons make a 128, if you had the 4.5 stroke it would make it a 131. Thanks H9FXE
  • Question:
    4/1/2022
    What exhaust is recommended for this kit on a 21 softail sportglide? Just the streetcannon slip on ot the full se 2-1?
    JohnK - Tampa bay
    • Answer:
      JohnK, I would suggest talking to your local dealer for assistance with exhaust choices Thanks H9FXE
  • Question:
    3/28/2022
    does it come with gaskets,
    cranky - florida
    • Answer:
      cranky, Yes, all the gaskets are included, but Requires separate purchase of Cam Drive Retention Kit P/N 25566-06. Installation may require Cam Spacer Kit P/N 25928-06. '18-'19 models require separate purchase of High-Capacity Oil Pump P/N 62400247. All models require ECM calibration with Screamin' Eagle Pro Street Tuner for proper installation. Thanks H9FXE read more.

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