| Specification | Value |
|---|---|
| Engine | Milwaukee-Eight 117 V-Twin |
| Oil Capacity | 4.3 L (20W-50) |
| Front Tire | 130/90B16 67H (36 psi) |
| Rear Tire | 150/80B16 77H (40 psi) |
| Spark Plug | 6R10 |
| Battery | 66000207 |
Engineering Highlight: The 2024-2025 Heritage Softail Classic marks a significant era for the Softail chassis, as the 117 cubic inch Milwaukee-Eight—once a powertrain exclusive to the premium CVO lineup—has become the standard heart of this vintage-inspired cruiser. This transition represents a 10% increase in torque over the previous 114 platform, achieved through a precision-engineered 4.075-inch bore and high-performance camshaft profiles.
Technical Performance & Handling
The FLHC/25 utilizes the monoshock Softail frame, which hides the rear suspension beneath the seat to maintain the classic ‘hardtail’ silhouette of the 1950s Hydra-Glide. Despite its nostalgic appearance, the engineering is contemporary. The 117 engine features dual counter-balancers to negate primary vibrations while preserving the visceral ‘thumping’ character expected of a Big Twin. This specific model (FLHC/25) is tuned for a massive swell of mid-range torque, making it the most capable touring-oriented Softail in Harley-Davidson’s current catalog.
Maintenance Guide: MotoSpecsLab Standards
To maintain the high-performance tolerances of the 117 cui engine, strict adherence to the lubrication schedule is paramount. The Milwaukee-Eight 117 uses a dry-sump system; ensure oil levels are checked at operating temperature to avoid overfilling.
Lubrication & Fluids
- Engine Oil: 4.3 Liters of 20W-50. Synthetic is highly recommended for the 117 platform due to higher thermal loads.
- Primary Chaincase: Inspect and change every 10,000 miles to ensure clutch longevity.
Chassis & Tires
The Heritage Classic relies on a 16-inch wheel setup for that iconic fat-tire look. For optimal handling and to prevent uneven cupping, maintain 36 psi (2.5 bar) in the front 130/90B16 and 40 psi (2.8 bar) in the rear 150/80B16. Given the torque output of the 117 engine, rear tire wear should be monitored every 2,500 miles.
Electrical & Ignition
The FLHC/25 utilizes the 6R10 spark plugs. Gap should be checked regularly to ensure efficient combustion in the large-displacement cylinders. The 66000207 battery provides the high cold-cranking amps required to turn over the high-compression 117 V-Twin; use of a battery tender during storage is mandatory to prevent control module errors.
Frequently Asked Questions
Q: How often should I change the oil on the 117 Softail?
A: Harley-Davidson recommends every 5,000 miles, but for the 117 high-output engine, MotoSpecsLab suggests a 3,000-mile interval if riding in high-heat environments.
Q: Can I use 10W-40 oil?
A: Only in emergency situations. The 117 engine is designed for the viscosity of 20W-50 to protect the valvetrain and big-end bearings.