Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

This Stage IV Kit was developed to deliver maximum horsepower from the Milwaukee-Eight® engine – all the way to the redline. The system-matched combination of larger displacement cylinders, free flowing CNC-Ported cylinder heads and a cam with the highest available valve lift are the starting point to building the perfect engine for the performance junkie. Designed for a high level of flexibility, this package is ideal for riders who like to comfortably cruise at lower rpm but still have plenty of arm-pulling acceleration when you whack the throttle. Kit includes CNC Ported Cylinder Heads with Performance Valve Springs, 64mm Throttle Body, High Flow Injectors (5.5g/s), 4.075″ Bolt-On Cylinders, Forged 11:1 High Compression Aluminum Coated Pistons and Rings, SE8-515 Cam, Cam Bearing Upgrade, High Performance Tappets, Multi-layer Coated Head Gaskets, High Capacity Clutch Springs (1200N) and most necessary gaskets and seals. For ’17 and ’18 Touring models, installation of oil pump cover P/N 62400206 is recommended (sold separately). All models require ECM calibration with Screamin’ Eagle® Pro Street Tuner for proper installation. See Dealer for details. Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

• Stage IV Kit 114 to 117CI – Air/Oil-Cooled

• Black with Highlighted Fins – Matches Original Equipment Non-CVO Engines

• Increases power by up to 40% when compared to the Original Equipment engine configurations

• Delivers increased response throughout the entire RPM range

• Maintains flat torque curve from cruising RPM to redline

• Can be installed without removing the engine from the chassis

• Retains Original Equipment Factory Warranty

its ’18-’20 Softail® and ’19-’21 Touring models equipped with air/oil cooled 114CI Milwaukee-Eight® engine. Does not fit Trike models. Requires separate purchase of Cam Drive Retention Kit P/N 25566-06. Installation may require Cam Spacer Kit P/N 25928-06. For ’17-’18 Touring models, installation of Oil Pump Cover P/N 62400206 is recommended (sold separately). All models require ECM calibration with Screamin’ Eagle® Pro Street Tuner or dealership installed Screamin’ Eagle calibration for proper installation

Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

The Screamin’ Eagle Stage IV Kit for Milwaukee-Eight engines is an advanced, factory-engineered performance upgrade designed to extract maximum horsepower and torque from Harley-Davidson’s 114 ci powerplant, pushing displacement up to 117 ci with a matched set of high-end components. Developed by Harley-Davidson’s Screamin’ Eagle performance division, this kit is intended for riders who crave a significant boost in power throughout the entire RPM range—from strong low-end torque to full-throttle power at the top end. (Harley-Davidson) Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

At the heart of this Stage IV upgrade are machined, larger-displacement cylinders and forged high-compression pistons, which raise the engine’s capacity and combustion efficiency. The kit includes free-flowing CNC-ported cylinder heads equipped with performance valve springs for optimized airflow, while a high-lift SE8-515 camshaft delivers greater valve lift to support higher engine speeds and improved breathing. These core upgrades are designed to work together to improve engine output without the need for extensive custom machining. (Harley-Davidson) Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

To complement the internal cylinder work, the Stage IV Kit also features a large 64 mm throttle body and high-flow fuel injectors (5.5 g/sec) that ensure ample air and fuel delivery across all throttle positions. The result is noticeably quicker throttle response and stronger acceleration from first gear through cruising RPMs and all the way to redline. Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

The kit’s components are engineered for bolt-on installation without removing the engine from the chassis, preserving much of the bike’s factory feel while delivering a dramatic performance upgrade. Despite its high power potential, the kit maintains a flat torque curve—a smooth, usable powerband that enhances everyday rideability as well as spirited riding. (Harley-Davidson) Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

It’s finished in black with highlighted fins to aesthetically match many stock Milwaukee-Eight engines and is designed to retain the bike’s original factory warranty when installed by a dealer and paired with the required ECM calibration via a Screamin’ Eagle Pro Street Tuner. Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088

In summary, the Stage IV Kit is a comprehensive, premium performance upgrade that elevates the 114 ci Milwaukee-Eight to a formidable 117 ci engine, offering greater power, torque, throttle response, and overall performance for enthusiasts seeking serious performance gains. (Harley-Davidson) Harley-Davidson Screamin’ Eagle Milwaukee-Eight Engine Stage IV Kit – 114 to 117CI 92500088