Related Here's What Makes Harley-Davidson's Milwaukee-Eight 121 Special The most powerful Harley-Davidson bagger today is powered by the 121 Milwaukee-Eight V-Twin and produces over 125 horsepower. The Biggest Harley-Davidson Engine In 2026 Is The Milwaukee-Eight 121Old School Meets The New Cool2023 Harley-Davidson CVO Road Glide and CVO Street Glide Harley-DavidsonAt its debut, the Milwaukee-Eight series of engines ranged from 107 cubic inches (1,753 cc) to 117 cubic inches (1,917 cc). The Twin TwinsDifferences Between The Milwaukee Eight 121 VVT and HOHarley-Davidson Road Glide CVO Harley-DavidsonThe 121 engine is a relatively high-compression engine, with an 11.4:1 compression ratio. Harley-Davidson Milwaukee-Eight HO 121 engine Harley-DavidsonThe CVO Road Glide ST focuses on absolute performance since it has sporting intentions. The Milwaukee Eight Series: The HistoryA Leap Forward For The BrandMilwaukee-Eight 107 engine in a 2019 Harley-Davidson Road Glide Harley-DavidsonTo fully understand how significant the Milwaukee-Eight engine is we need to know the history behind it.