18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

The 2018–2023 Harley-Davidson FXBB Softail Street Bob engine featuring the Milwaukee-Eight 107 (M8 107) is a powerful, factory-engineered V-twin motor designed to deliver strong performance, reliability, and the unmistakable Harley riding experience. As part of Harley-Davidson’s modern Softail lineup, this engine represents a significant evolution in both power delivery and overall refinement compared to earlier generations. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

At its core, the Milwaukee-Eight 107 is a 107 cubic inch (1,746cc) V-twin engine built with precision and performance in mind. It features a classic 45-degree V-twin configuration, staying true to Harley-Davidson’s heritage while incorporating advanced engineering improvements. The engine utilizes a single camshaft design with four valves per cylinder—totaling eight valves—allowing for improved airflow, better combustion efficiency, and enhanced overall performance. (my2019.h-dmediakit.com) 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

One of the standout characteristics of the M8 107 engine is its impressive torque output. Producing approximately 145 Nm (107 ft-lb) of torque at around 3,000 RPM, this engine delivers strong low-end pulling power, making it ideal for both city cruising and highway riding. (Harley-Davidson Media Site) This torque-focused performance ensures smooth acceleration and effortless power delivery, allowing riders to enjoy a responsive and engaging ride without constantly shifting gears. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

The Milwaukee-Eight engine was designed to improve rider comfort as well as performance. It features an internal counterbalancer system that significantly reduces engine vibration, especially at higher speeds, while still maintaining the signature Harley-Davidson feel. (The V-Twin Blog) This results in a smoother ride compared to previous Twin Cam engines, making long-distance touring more enjoyable and less fatiguing. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

Cooling efficiency is another major advantage of the M8 107. The engine incorporates improved airflow and heat management systems, including redesigned cylinder heads and optimized oil cooling. These enhancements help maintain consistent performance and reduce heat buildup, especially in stop-and-go traffic or warm riding conditions. (Drag Bike News) Additionally, the engine’s refined combustion process contributes to better fuel efficiency and lower emissions, aligning with modern performance standards. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

The engine is paired with a 6-speed Cruise Drive transmission, providing smooth gear transitions and efficient power transfer to the rear wheel. (my2019.h-dmediakit.com) This setup allows riders to cruise comfortably at highway speeds with reduced engine strain, while still having plenty of power available when needed. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

From a structural standpoint, the Milwaukee-Eight 107 is designed to integrate seamlessly into the Softail frame. The rigid engine mounting enhances chassis stiffness, improving overall handling and responsiveness. (The V-Twin Blog) This combination of engine and frame design contributes to the Street Bob’s balanced ride quality, offering both agility and stability. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

In terms of sound and character, the M8 107 retains the iconic Harley-Davidson exhaust note while reducing unwanted mechanical noise. Riders can still enjoy the deep, throaty rumble associated with Harley engines, but with a more refined and controlled tone. (The V-Twin Blog) This balance of tradition and innovation is a key feature of the Milwaukee-Eight platform. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

Durability and reliability are also central to this engine’s design. Built with high-quality materials and advanced manufacturing techniques, the M8 107 is engineered to withstand long-term use and demanding riding conditions. Its robust construction makes it suitable for stock replacements, rebuilds, or performance upgrades, giving riders flexibility for customization. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee

Overall, the 18–23 Harley-Davidson FXBB Softail Street Bob Milwaukee-Eight 107 engine is a premium OEM motor that combines classic V-twin heritage with modern engineering advancements. With strong torque, smoother operation, improved cooling, and enhanced reliability, it stands as a top choice for riders seeking a powerful and dependable engine for their Softail motorcycle. 18-23 Harley-Davidson FXBB Softail Street Bob Engine Motor 107 M8 Milwaukee