| Specification | Data |
|---|---|
| Production Years | 2007 – 2017 |
| Engine Type | Liquid-cooled, Revolution® V-Twin |
| Oil Grade/Capacity | SAE 20W-50 (4.3 L) |
| Front Tire | 120/70 ZR 19 |
| Rear Tire | 240/40 R 18 |
| Tire Pressure (F/R) | 36 psi / 42 psi |
| Spark Plug | HD-10R12A |
| Battery | 65989-97D |
At MotoSpecsLab, we recognize the Harley-Davidson Night Rod Special (VRSCDX) as a pivotal moment in American motorcycling history. Unlike the air-cooled traditionalism of the Big Twin lineup, the VRSCDX was born from a collaboration between Milwaukee and Porsche Engineering. The result was the ‘Revolution’ engine—a liquid-cooled, 60-degree V-twin derived directly from the VR-1000 superbike program, marking the first time Harley-Davidson successfully integrated high-RPM overhead cam performance into a street-legal cruiser chassis.
Engineering Deep-Dive: The Revolution Engine
The heart of the VRSCDX is a 1250cc (in later models) powerplant that defies cruiser conventions. With a redline approaching 9,000 RPM, the dual overhead cams and four-valve heads provide a linear power delivery that is more reminiscent of a European sport-tourer than a traditional chopper. The ‘Special’ variant is distinguished by its blacked-out engine components and the aggressive, streamlined silhouette that redefined the ‘Power Cruiser’ category.
Maintenance Guidelines & Technical Requirements
Maintaining the Night Rod Special requires precision, particularly regarding its cooling system and high-performance lubrication needs. As the Editor-in-Chief, I recommend strictly adhering to the following intervals:
- Lubrication: The system requires 4.3 liters of SAE 20W-50. For optimal thermal stability in the high-revving Revolution engine, SYN3 Synthetic is the preferred choice over standard mineral oils.
- Ignition: Ensure the use of HD-10R12A spark plugs. Given the engine’s high compression ratio, fouled plugs can significantly degrade throttle response.
- Electrical: The VRSCDX utilizes the 65989-97D battery. Due to the high cranking amps required for the V-Twin, maintaining a tender during off-seasons is critical.
Chassis and Handling Dynamics
The VRSCDX is famous for its massive 240mm rear tire. While this provides an unmistakable aesthetic and exceptional straight-line stability, it requires specific air pressure management to maintain cornering agility. We recommend a rigid 2.9 bar (42 psi) for the rear and 2.5 bar (36 psi) for the front 120/70 ZR 19 tire. Deviating from these pressures can lead to ‘heavy’ steering and uneven tread wear on the wide rear carcass.
MotoSpecsLab Verdict
The Harley-Davidson Night Rod Special remains a masterclass in aggressive styling and performance engineering. It is a machine for the rider who demands the soul of a Harley with the mechanical sophistication of a German-engineered powertrain. Proper maintenance of the liquid-cooling system and adherence to tire pressure specs are the keys to preserving the unique handling characteristics of this modern classic.