| Specification | Value |
|---|---|
| Engine | Milwaukee-Eight 107 (1745cc) |
| Oil Type & Capacity | SAE 20W-50 (4.7 Liters) |
| Front Tire | MT90B16 72H (2.5 bar / 36 psi) |
| Rear Tire | 180/65B16 81H (2.9 bar / 42 psi) |
| Battery Part Number | 66000175 |
| Spark Plug Part Number | 60400001 |
The 2017 model year stands as a pivotal milestone in the history of the Road King Classic (FLHRC). It represents the inaugural implementation of the Milwaukee-Eight 107 powertrain within the touring chassis—a transition that solved decades of thermal management challenges associated with the outgoing Twin Cam architecture. Specifically for the Euro 4 compliant FLHRC/17, Harley-Davidson engineered a sophisticated exhaust and intake system to meet stringent emissions without sacrificing the signature low-end torque that defines the touring experience.
Engineering Deep Dive: The Milwaukee-Eight Transition
The FLHRC/17 features the four-valve-per-cylinder head design, which offers 50% more intake and exhaust flow capacity. From a maintenance perspective, the inclusion of dual spark plugs (Part #60400001) per cylinder ensures more efficient combustion, which is critical for Euro 4 compliance. The counter-balanced engine mounting provides a smoother idle while retaining the visceral feel that Road King purists demand.
Maintenance Guide & Technical Specs
Lubrication System
The Milwaukee-Eight 107 requires a substantial oil volume to manage heat. Use 4.7 liters of SAE 20W-50. At MotoSpecsLab, we recommend full synthetic fluids for the FLHRC to ensure longevity of the hydraulic lifters and to maintain stable viscosity under high-load touring conditions.
Tires and Chassis
The Road King Classic is distinguished by its laced wheels and whitewall tires. Maintaining precise pressure is vital for handling stability on a machine with a wet weight exceeding 370kg.
- Front: MT90B16 72H at 2.5 bar (36 psi).
- Rear: 180/65B16 81H at 2.9 bar (42 psi).
Under-inflation on the rear tire is the leading cause of ‘bagger wobble’ in high-speed sweepers.
Electrical System
The 2017 FLHRC utilizes the high-output charging system designed to support the infotainment and lighting loads of the touring range. The required battery is part 66000175. Given the parasitic draw of the security system, a battery tender is mandatory for periods of inactivity exceeding two weeks.
MotoSpecsLab Verdict
The FLHRC/17 is the bridge between classic H-D aesthetics and modern mechanical reliability. By combining the heritage look of leather-wrapped saddlebags with the precision of the Milwaukee-Eight engine, it remains one of the most balanced touring platforms ever produced. Proper adherence to the 4.7L oil capacity and strict tire pressure monitoring will ensure this Euro 4 classic remains a reliable transcontinental companion.
Frequently Asked Questions
Q: What is the specific spark plug gap for the 60400001 plugs?
A: The standard gap for the Milwaukee-Eight plugs is 0.030-0.035 inches (0.76-0.89 mm).
Q: Can I use 10W-40 oil?
A: While 10W-40 can be used in colder climates, H-D technical standards specify SAE 20W-50 as the primary lubricant for the FLHRC/17 to protect the heavy-duty bearings in the 107ci engine.