More Upgrades for Harley-Davidson's Milwaukee Eight

Whether you want your Milwaukee-Eight engine at Stage I, II, or III, Harley-Davidson is rolling out all the upgrades to make their heartbeat just that much stronger. Check out the Screamin' Eagle Pro Street Tuner for Stage I mods as well as all the upgrades in Stage II and III.

Screamin' Eagle Pro Street Tuner
Optimized engine performance with Stage I intake and exhaust system must be accompanied by a new Electronic Control Module (ECM) calibration that tunes the EFI for the new components. The new Screamin' Eagle Pro Street Tuner (P/N 41000008C, $299.95) is designed to simplify ECM calibration as performance modifications are made. Unlike many aftermarket tuners, the Screamin' Eagle Pro Street Tuner re-programs the motorcycle's operating system; it isn't a piggyback system that tries to fool the ECM into adding more fuel or changing the ignition timing. The Pro Street Tuner plugs into the bike's data port, so no splicing or under-seat hardware is required.

The Pro Street Tuner can be used to upload the latest Engine Control Module (ECM) calibrations to match a bike’s state-of-tune. Ideal for real-world street performance applications, the Pro Street Tuner provides adjustability to accommodate bike-to-bike variation and for changes to cams, heads, intake and exhaust while maintaining closed-loop fuel control for optimal fuel economy in the part-throttle operating range. All current street-compliant ECM calibrations are included in the software with unlimited access to future calibrations and free software updates downloadable via the user website. The Pro Street Tuner stores up to 15 minutes of run-time data that can be downloaded to a PC and viewed and evaluate the bike’s air/fuel ratio, oxygen sensor readings, engine speed and temperature, RPM and vehicle speed, throttle position, spark advance and much more. Diagnostic Trouble Codes can also be viewed and deleted. Unlike other race tuners or engine controllers, the Screamin’ Eagle Pro Street Tuner is 50-state EPA compliant and does not impact the Harley-Davidson factory warranty coverage.

Screamin' Eagle Stage II for Milwaukee-Eight is Stage I Plus Performance Camshaft
Take a Screamin' Eagle Stage I equipped Harley-Davidson Milwaukee-Eight engine to the next level with a Screamin' Eagle Milwaukee-Eight Stage II Kit. Each kit features a performance camshaft that increases air flow by lifting the cylinder head valves higher and holding them open for a longer period of time than the stock cam, which enables greater intake and exhaust flow. Harley-Davidson Genuine Motor Parts & Accessories offers two Screamin' Eagle Stage II camshaft choices for the Milwaukee-Eight engine to allow riders to focus performance based on riding style. ECM calibration with Screamin' Eagle Pro Street Tuner is required for proper installation.

The Screamin' Eagle Milwaukee-Eight Stage II - Torque Kit (P/N 92500047, $389.95*) delivers on-demand throttle response from low to mid RPM at cruising speed. Installed in the Milwaukee-Eight, this cam produces more than 100 lb-ft of rear wheel torque from 2,500 to 4,500 RPM in Milwaukee-Eight 107 engines, an ideal power band for passing slow-moving vehicles without a downshift and compensating for the weight of a passenger and luggage. Kit components include a Screamin' Eagle SE8-447 cam, adjustable pushrods, pushrod covers, O-rings, and a cam cover gasket.

Riders will get an adrenaline-pumping burst of speed from the Milwaukee-Eight engine by installing the Screamin' Eagle Milwaukee-Eight Stage II – Power Kit (P/N 92500058, $389.95). A Screamin' Eagle power camshaft starts to pile on power at 3000 RPM and produces more than 90 rear wheel horsepower from 4,500 RPM to redline in Milwaukee-Eight 107 engines. This kit is ideal for riders who want to ride the bike aggressively while downshifting to lower gears to keep the engine operating in the higher RPM range. Kit components include a Screamin' Eagle SE8-462 cam, adjustable pushrods, pushrod covers, O-rings, and a cam cover gasket.

Screamin' Eagle Stage III for Milwaukee-Eight is Stage I plus Big Bore Pistons and Cylinders
It's a simple recipe for performance: Increase the size of the engine and you increase power output throughout the entire RPM range. Screamin' Eagle Stage III kits take a Stage I-equipped Milwaukee-Eight 107 to 114 cubic inches, and the Milwaukee-Eight 114 engine to 117 cubic inches. Behind a Stage III Kit, touring riders will feel like they are solo even when loaded up with a passenger and cargo. Both kits feature bolt-on cylinders that can be installed without removing the engine from the motorcycle, reducing the required time and complexity of installation. The Stage III Kits include SE 4.075-inch cylinders, forged 11:1 coated aluminum pistons, high-performance piston rings, an SE8-498 camshaft, SE performance valve springs, SE high performance tappets, multi-layer coated head gaskets, and cylinder base and cam cover gaskets. ECM calibration with Screamin' Eagle Pro Street Tuner is required for proper installation.

The Screamin' Eagle Stage III Kit for Milwaukee-Eight 107 (P/N 92500056, $1,595.95*) increases compression ratio from 10.0:1 to 11:1, boosts mid-range torque up to 24 percent and delivers up to 39 percent more power when compared to the original equipment engine configuration.

The Screamin’ Eagle Stage III Kit for Milwaukee-Eight 114 (P/N 92500057, $1,595.95*) for CVO Touring models produces 100 to 110 rear-wheel horsepower from 4,750 RPM to redline and more than 100 lb-ft of rear-wheel torque from 2,750 to 5,750 RPM.