| Specification | Data / Value |
|---|---|
| Production Years | 2018–2021 |
| Engine Type | Air-cooled, Evolution® V-Twin |
| Engine Oil | Harley-Davidson 360 20W50 (2.65 L) |
| Tire Size (Front) | 100/90B19 57H |
| Tire Size (Rear) | 150/80B16 77H |
| Tire Pressure (F/R) | F: 30 psi / R: 36-40 psi |
| Battery Part Number | 65958-04C |
| Spark Plugs | Harley-Davidson 6R12 |
The Harley-Davidson Sportster 1200 Iron (XL1200NS) is a significant milestone in the Motor Company’s history, serving as one of the final iterations of the legendary air-cooled Evolution engine platform. A unique engineering highlight of the XL1200NS is its utilization of the high-torque 1200cc configuration paired with the slim, narrow chassis of the 883 Iron, creating a power-to-weight ratio that remains a benchmark for the Sportster lineup. This model pays homage to the 1970s AMF-era styling while maintaining modern EFI and ABS standards.
Engineering Overview: The Evolution Engine
At the heart of the XL1200NS is the 1202cc Evolution engine. Known for its reliability and distinct character, this engine features aluminum heads and cylinders to improve cooling efficiency. Unlike the newer liquid-cooled Revolution Max engines, the Evolution maintains the hydraulic lifters and pushrod-actuated overhead valves that define the classic Harley-Davidson sound and feel.
Maintenance Protocol
Lubrication System
For optimal thermal stability, the XL1200NS requires 2.65 Liters of Harley-Davidson 360 20W50 oil. Given the air-cooled nature of the V-Twin, regular oil changes are critical to prevent viscosity breakdown in high-traffic or high-temperature environments.
Chassis and Contact Patch
The Iron 1200 is equipped with 100/90B19 front and 150/80B16 rear tires. Maintaining precise pressure is vital for handling: 2.1 bar (30 psi) in the front, and 2.5 bar (36 psi) in the rear for solo riders. When carrying a passenger, the rear pressure should be increased to 2.8 bar (40 psi) to compensate for the additional load on the swingarm.
Electrical and Ignition
The electrical system relies on the 65958-04C battery. To ensure consistent combustion and cold-start reliability, the Harley-Davidson 6R12 spark plugs should be inspected for carbon fouling at every service interval.
Frequently Asked Questions
Q: Can I use synthetic oil in the XL1200NS?
A: Yes, while the factory spec is H-D 360 20W50, many owners opt for Screamin’ Eagle Syn3 for better performance in extreme heat.
Q: How often should the spark plugs be replaced?
A: Under standard conditions, the 6R12 plugs should be replaced every 30,000 miles, though inspection every 5,000 miles is recommended.