This engine delivers 120 lb. ft. (163 Nm) peak torque and 98 horsepower (73 kW), 4 percent more power and 1 foot pound more torque (U.S. spec) than the 2024 Milwaukee-Eight 114 engine it replaces for a performance boost.
Review – Key Features – Features & Benefits – Specifications
2025 Harley-Davidson Milwaukee-Eight 117 Classic Engine: FLAT TORQUE CURVE.
Introducing the 2025 Harley-Davidson Milwaukee-Eight 117 Classic Engine…
Milwaukee-Eight 117 Classic (powers Street Bob and Heritage Classic models) is tuned with a flat torque curve to deliver satisfying street performance and emphasize ease in rideability. The single muffler and classic round air cleaner produce the distinctive Harley-Davidson sound quality. This engine delivers 120 lb. ft. (163 Nm) peak torque and 98 horsepower (73 kW), 4 percent more power and 1 foot pound more torque (U.S. spec) than the 2024 Milwaukee-Eight 114 engine it replaces for a performance boost. A 2-into-1 exhaust enhances engine tuning by promoting efficient scavenging of exhaust from the engine cylinders.
2025 Harley-Davidson Milwaukee-Eight 117 Classic Engine Totalmotorcycle.com Key Features
Three New Milwaukee-Eight 117 Powertrains – The 2025 Cruiser models will be powered by one of three new Milwaukee-Eight 117 powertrain variants with new cylinder heads, throttle body and intake manifold. Each is tuned – through difference in intake and exhaust scheme and ride mode programming – to offer performance that matches the personality of a specific Cruiser model and the anticipated expectations of that model’s customer. Each engine is Euro V+ Compliant (2024 emissions standards). Shared features of these engines include:
- NEW Four-Valve Cylinder Heads feature the combustion chamber shape, oval intake ports and low-profile intake valve seats as introduced on 2023/24 Milwaukee-Eight 117/121 engines for Grand American Touring and CVO™ models. These heads are designed to improve performance and fuel economy.
- NEW Engine Oil is routed from a frame-mounted oil cooler through cylinder head cooling passages. This cylinder head cooling system further optimizes thermal comfort for the rider, especially in low-speed riding situations and hot weather. This air/oil cooled version of the Milwaukee-Eight 117 engine weighs less that the Grand American Touring/CVO™ versions of the engine and does not require coolant system maintenance.
- NEW Contoured Aluminum Intake Manifold offers a more-direct air path and creates a smooth transition from the round throttle body to the new oval intake ports to enhance intake air flow for improved power and reduced exhaust emissions.
- NEW Improved Sound Quality as muffler and intake have been designed to enhance sound quality and match the character of each engine variant. Mufflers feature advanced lightweight material that works to trim high frequencies and emphasize low frequencies for a powerful sound.
- Dual Counter-Balancers are tuned to eliminate primary vibration at idle while permitting some engine character to shine through at speed.
- V-Twin Design with 45-degree cylinder angle maintains classic Harley-Davidson look-sound-feel.
- Compression Ratio of 10.3:1 enhances torque at lower RPM and improves fuel economy.
2025 Harley-Davidson Milwaukee-Eight 117 Classic Engine Totalmotorcycle.com Features and Benefits
- NEW Milwaukee-Eight 117
- A Milwaukee-Eight 117 powertrain with more displacement and enhanced intake and exhaust flow offers 105 horsepower (78 kW) and 130 lb. ft (176 Nm) of peak torque, 6.6 percent more torque and 12.9 percent more horsepower than the Twin Cooled™ Milwaukee-Eight 114 powertrain in 2024 Grand American Touring models.
- Milwaukee-Eight 117-cylinder head cooling system further optimizes engine temperatures, especially in low-speed riding situations and hot weather, compared to 2024 Twin-Cooled™ Milwaukee-Eight 114 engine.
2025 Harley-Davidson Milwaukee-Eight 117 Classic Engine – Totalmotorcycle.com Specifications/Technical Details
| Engine | Milwaukee-Eight 117 Classic | |
| Valves | Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; four valves per cylinder | |
| Bore | 4.075 in. (103.5 mm) | |
| Stroke | 4.5 in. (114.3 mm) | |
| Displacement | 117 cu in (1,923 cc) | |
| Compression Ratio | 10.3:1 | |
| Fuel System | Electronic Sequential Port Fuel Injection (ESPFI) | |
| Air Cleaner | 9 in. (229 mm) round, center bolt cover with washable fiberglass filter media | |
| Exhaust | 2-into-1; catalyst in header | |
| Lubrication System | Pressurized, dry-sump with oil cooler | |
| Primary Drive | Chain, 34/46 ratio | |
| Final Drive | Belt, 32/66 ratio | |
| Clutch | Mechanical, 10 plate wet, assist & conventional | |
| Transmission | 6-Speed Cruise Drive | |
| Gear Ratios (overall) 1st | 9.311 | |
| Gear Ratios (overall) 2nd | 6.454 | |
| Gear Ratios (overall) 3rd | 4.793 | |
| Gear Ratios (overall) 4th | 3.882 | |
| Gear Ratios (overall) 5th | 3.307 | |
| Gear Ratios (overall) 6th | 2.79 |
Manufacturer Specifications and appearance are subject to change without prior notice on Total Motorcycle (TMW).
