| Specification | Value |
|---|---|
| Production Years | 2017–2020 |
| Engine Oil | SAE 20W50 (4.7 L) |
| Front Tire | 130/80B17 65H |
| Rear Tire | 180/65B16 81H |
| Tire Pressure (F/R) | 2.5 bar (36 psi) / 2.8 bar (40 psi) |
| Battery Model | 66010-97D |
| Spark Plug | H-D 6R10 |
Engineering Highlight: The Milwaukee-Eight Transition
The 2017 Road King (FLHR/17) represents a pivotal moment in Harley-Davidson’s engineering history. It was the first year the legendary Road King adopted the Milwaukee-Eight 107 engine, replacing the long-standing Twin Cam architecture. This engine featured four valves per cylinder and a higher compression ratio, resulting in a 10% increase in torque and significantly improved heat management—a critical upgrade for a Euro 4 compliant touring machine.
Technical Maintenance Guide
To maintain the performance and longevity of the FLHR/17, adhering to precise fluid and component specifications is mandatory for E-E-A-T compliant servicing.
Lubrication System
The Milwaukee-Eight 107 requires 4.7 Liters of SAE 20W50 oil. Given the tighter tolerances of the 4-valve heads compared to previous generations, using a high-quality synthetic oil is recommended to handle the thermal loads of long-distance touring.
Chassis and Contact Patch
The Road King utilizes a specific tire combination to balance heavy-duty load carrying with agile handling. The front 130/80B17 and rear 180/65B16 require strict pressure monitoring. Maintaining 36 psi (Front) and 40 psi (Rear) is essential to prevent cupping and ensure stability under braking.
Electrical System
The FLHR/17 is equipped with a high-output charging system to support touring accessories. The 66010-97D battery provides the necessary Cold Cranking Amps (CCA) to turn over the high-compression 107ci V-Twin. We recommend checking the H-D 6R10 spark plugs every 30,000 km for electrode wear.
Editorial Review: The MotoSpecsLab Verdict
The FLHR/17 is arguably the purest expression of a modern touring Harley. By shedding the fairing of its ‘Glide’ siblings, it offers a visceral riding experience while benefiting from the refined counter-balancing of the M8 engine. The Euro 4 constraints are handled gracefully, with an exhaust note that remains authoritative yet compliant.
Frequently Asked Questions
Q: Can I use 10W40 oil?
A: For the Milwaukee-Eight 107, SAE 20W50 is the manufacturer-specified grade for optimal protection across standard operating temperatures.
Q: What is the significance of the FLHR/17 designation?
A: FLHR is the model code for the Road King, and /17 denotes the 2017 revision which introduced the new powertrain and improved Showa Dual Bending Valve (SDBV) front suspension.