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Screamin' Eagle 135ci Stage IV Performance Crate Engine Air/Oil Cooled & Twin Cooled

For the rider demanding for no-compromise performance. This is the most displacement, and the most power, ever created by Harley-Davidson for a street-compliant crate performance engine. Engineered by the pros at Harley-Davidson and built from the bottom up in Milwaukee, this street-tuned 135-cubic-inch Screamin’ Eagle® Crate Engine is designed to run with a wide-open throttle at high engine speeds and provide instant passing power from cruising speed. Made for riders seeking maximum displacement, compression, and flow, it delivers 143 ft-lb of torque to the rear wheel as soon as the throttle is cranked. Stage IV equipped engine includes 135 Stage IV badging on the cylinder heads and timer cover to highlight the powerplant. This street-ready performance motor features the finest Screamin’ Eagle® components: Screamin' Eagle® Extreme CNC-ported cylinder heads, SE8-517 high-lift cam, new high-compression forged pistons, high-performance cam bearing, high-performance tappets, patent-protected 4.31" steel sleeve cylinders, new 4 5/8" flywheel, new 68mm throttle body and CNC-machined 68mm intake manifold, new 6.2 g/sec fuel injectors, and Screamin' Eagle® Pro Billet Cam Plate and Oil Pump.

  • Chrome & Gloss Black finish
  • We've done your homework - Engineered and tested as a complete collection of high-performance components by the Screamin’ Eagle pros at Harley-Davidson
  • This combination is designed for wide open throttle along with high end RPMs and a significant torque increase from a cruising speed
  • Ready for bolt-in installation in the Original Equipment-style chassis of your Touring bike
  • No special fabrication or engine-mount relocation is required
  • Engine features up to two-year manufacturer’s warranty for unmatched confidence when dealer-installed within 60 days of vehicle purchase through the Custom Coverage program
  • Factory assembled at the Powertrain Operations facility in Milwaukee, Wisconsin 

Screamin' Eagle Milwaukee-Eight 131 Performance Crate Engine Oil Cooled & Twin Cooled

Built from the bottom up in Milwaukee, this street-tuned 131-cubic-inch Screamin’ Eagle Crate Engine is designed to run with a wide-open throttle at high engine speeds and provide instant passing power from cruising speed. Made for riders seeking maximum displacement, compression and flow, it delivers 135 ft-lb of torque to the rear wheel as soon as the throttle is cranked. Stage IV equipped engine includes 131 Stage IV badging on the cylinder heads and timer cover to highlight the powerplant. This street-ready performance motor features the finest Screamin’ Eagle components: engraved CNC-ported cylinder head with CNC-machined chamber and 1mm larger valves, SE8-517 high-lift cam, high-compression forged pistons, high-performance cam bearing, high-performance tappets, patent-protected 4.31" steel sleeve cylinders, 64mm throttle body and cast manifold and 5.5 g/sec fuel injectors.

  • Black and Gloss Black finish
  • Ready for bolt-in installation in the Original Equipment-style chassis of your Softail bike
  • No special fabrication or engine-mount relocation is required
  • Engine features one-year manufacturer’s warranty for unmatched confidence
  • Eligible for coverage under factory vehicle warranty when dealer-installed within 60 days of vehicle purchase
  • Factory assembled at the Powertrain Operations facility in Milwaukee, Wisconsin
  • Pending 49-State U.S. EPA compliant

Screamin' Eagle Milwaukee-Eight Engine Stage IV Kit - 114CI or 117CI to 131CI

Go big or go home. With the largest displacement of any Harley-Davidson Stage Kit, this 114CI to 131CI Stage IV Kit was 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. 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 131 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 Head with CNC machined chamber and 1mm larger valves, Stage IV Timer Cover, SE8-517 High-Lift Cam, Forged High Compression Pistons, High Performance Cam Bearing and Tappets, 4.31" Steel Sleeve Cylinders, 64mm Throttle Body and Cast Manifold and High Flow Injectors (5.5 g/sec).

  • Stage IV Kit - 114CI or 117CI to 131CI for Oil Cooled models
  • Delivers increased response throughout the entire RPM range
  • Provides thrilling acceleration when twisting the throttle
  • Maintains flat torque curve from cruising RPM to redline
  • Can be installed without removing the engine from chassis
  • Retains Original Equipment Factory Warranty
  • 49-State U.S. EPA Compliant on '17-later Touring models

Exhaust not included (see dealer for details)

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