The Screamin' Eagle 131 is the largest factory engine that Harley-Davidson has ever produced.

With the introduction of its "largest, most powerful street-compliant engine" to yet, the Screamin' Eagle Milwaukee-Eight 131 Crate Engine, Harley-Davidson is putting the adage "no alternative for displacement" into practice. The high-flow fuel injectors are supplied by ported heads that are part of the 131 cubic-inch (2151cc) V-twin engine that has enormous 4.31-inch pistons. The monstrous throttle body has a measurement of 64 millimeters, while the valves in the four-valve cylinder heads have grown by one millimeter in size. Along with a high-performance cam bearing and a high-lift SE8-517 camshaft, the Screamin' Eagle 131 package also includes a high-lift camshaft. According to Harley, the engine was designed to operate at high revolutions per minute (rpm), and the torque levels are brought to new highs as soon as the throttle is cracked open. Harley states that the M8 131, when equipped with a set of Screamin' Eagle Street Cannon mufflers, is capable of producing 135 pound-feet of torque as well as 124 horsepower at the rear wheel.

According to Harley-Davidson Product Manager James Crean, who was quoted in a news release, "Our riders who are looking for an adrenaline rush requested for exhilarating power and torque with reliability." The Screamin' Eagle 131 Crate Engine is capable of delivering precisely that.

The Milwaukee-Eight 131 Crate Engine is compatible with Harley-Davidson Touring bikes manufactured in 2017 or after that have a Milwaukee-Eight engine that is either oil-cooled or twin-cooled, as well as some Softail motorcycles manufactured in 2018 or later. The price is $6,195 for engines that use oil cooling, and it is $6,395 for engines that use dual cooling. A limited manufacturer guarantee of one year is provided for the Screamin' Eagle 131 in the event that it is fitted by a Harley-Davidson authorized dealer. Despite this, there are a few more costs that need to be taken into mind. In addition, owners of Harleys manufactured in 2017–2019 will be required to purchase a high–capacity oil pump. Additionally, owners of motorcycles manufactured in 2017–2018 will be required to upgrade to a Screamin' Eagle High–Capacity Clutch Plate Kit. Finally, owners of motorcycles manufactured in any year will be required to have their ECMs recalibrated.

Special 131 Stage IV badging can be seen on the cylinder heads and cover of the Screamin' Eagle M8 131, which is offered in two different color combinations: black and chrome or black and gloss black. We stopped by the Southern California fleet center of Harley-Davidson the week before last, and while we were there, they started up a Street Glide with the new Screamin' Eagle exhaust, and the note it produced was low, furious, and ready to be unleashed.