Harley-Davidson has announced a new Screamin’ Eagle 135ci (2,122cc) Stage IV Performance Crate Engine option for 2021 and later touring models. This engine upgrade will be the biggest and most powerful street-legal crate engine H-D has ever offered. It will carry a price tag of $7,999.95 in either black or chrome finish and be available in two versions: one designed to work with models equipped with an air/oil-cooled Milwaukee-Eight engine and another designed for models equipped with a twin-cooled Milwaukee-Eight cruiser engine.
The new mill bolts on to the original Touring chassis, so installation will be straightforward. It will feature a bevy of premium Screamin’ Eagle components as well. These include new 10.7:1, high-compression forged pistons, CNC-ported cylinder heads that are designed to maximize efficiency and performance. There will also be a new 68mm throttle body, CNC-machined intake manifold, a Pro Billet cam plate and oil pump, a high-performance cam bearing and high-lift camshaft, and high-capacity injectors.
All together the package puts out up to 143 lb.-ft. of torque at 3,500 rpm. It also offers 130 hp at 5,500 rpm. These figures are 28 percent and 41 percent more, respectively, than those offered by the production Milwaukee-Eight 117 engine.
Riders will want to utilize the wireless Screamin’ Eagle Pro Street Performance Tuner to recalibrate the ECM and optimize engine output, and will no doubt consider adding the Screamin’ Eagle Ventilator Extreme Air Cleaner and Street Cannon mufflers, both of which are sold separately.