| Specification | Detail |
|---|---|
| Model Range | 2017-2018 (FLTRXS/107) |
| Engine Type | Milwaukee-Eight 107 V-Twin (Euro 4) |
| Oil Type | HD 360 or SYN3 (20W50) |
| Oil Capacity | 3.8 Liters (4.0 US Quarts) |
| Tire Size | F: 130/60B19 61H / R: 180/55B18 80H |
| Battery | 66010-97D |
| Spark Plugs | HD-60400001 (10M-1RG) |
The 2017-2018 Harley-Davidson Road Glide Special (FLTRXS) represents a pivotal moment in the Motor Company’s history. It marked the introduction of the Milwaukee-Eight 107 engine, the first entirely new Big Twin engine design in nearly two decades. To meet stringent Euro 4 emissions standards, Harley-Davidson engineered this powerplant with four valves per cylinder and dual spark plugs, achieving 10% more torque and significantly improved heat management compared to its predecessor, the Twin Cam.
Engineering & Performance
The hallmark of the Road Glide Special is its frame-mounted ‘shark-nose’ fairing. Unlike the handlebar-mounted ‘batwing’ fairing, this design isolates the steering geometry from wind buffeting, providing superior high-speed stability. The 107 cubic inch (1745cc) engine provides a refined power delivery, utilizing a counter-balancer to reduce vibration at idle while maintaining the classic Harley-Davidson feel under load.
Maintenance Guide & Technical Specs
Proper maintenance is critical for the longevity of the Milwaukee-Eight platform. Owners must adhere to the following technical requirements:
Lubrication System
The M8 engine requires 3.8 liters of high-quality lubricant. We recommend Harley-Davidson SYN3 20W50 Full Synthetic for optimal performance in high-temperature touring environments. Ensure the oil filter is replaced at every interval to prevent contaminant buildup in the precision oil-cooling passages.
Chassis and Tires
The FLTRXS utilizes a specific wheel combination (19-inch front, 18-inch rear) that requires precise inflation for handling safety. Maintain 2.5 bar (36 psi) in the front tire and 2.8 bar (40 psi) in the rear. Given the bike’s heavy touring weight, checking these pressures cold is essential before any long-distance journey.
Electrical System
The Euro 4 models feature sophisticated electronics, including the Boom!™ Box Infotainment system. A healthy battery is paramount. The 66010-97D battery provides the high cold-cranking amps (CCA) necessary to turn over the high-compression V-twin. Always use a battery tender if the motorcycle is stored for more than two weeks.
Frequently Asked Questions
Which spark plugs are required for the Milwaukee-Eight 107?
The engine uses four spark plugs (two per cylinder). The correct part number is HD-60400001 (10M-1RG).
Does the Euro 4 model differ significantly from US versions?
Mechanically, they are similar, but the Euro 4 version features specific ECU mapping and exhaust baffling to comply with European noise and emission regulations.