| Specification | Value |
|---|---|
| Model / Year | STREET GLIDE – FLHX / 2014 |
| Engine Oil | H-D 360 20W50 or SYN3 (3.8 L) |
| Front Tire | 130/60B19 61H (36 psi) |
| Rear Tire | 180/65B16 81H (40 psi) |
| Spark Plug | Harley-Davidson 6R12 (0.97–1.09 mm gap) |
| Battery | 66010-97E |
The 2014 Harley-Davidson Street Glide (FLHX) stands as a pivotal moment in the Motor Company’s history, serving as the flagship for Project RUSHMORE. Unlike previous iterations, this model was the result of a massive, rider-led engineering overhaul. The most distinctive engineering highlight of this year was the introduction of the Splitstream vent in the Batwing fairing, designed with fluid dynamics software to significantly reduce head buffeting—a first for the touring lineup.
Engineering & Performance
At the heart of the 2014 FLHX is the High Output Twin Cam 103™ engine. This iteration featured a new camshaft to increase low-end torque and a high-flow airbox, providing better passing power in 5th and 6th gears. From a technical perspective, the 2014 model also introduced the 49mm stiffened front forks and the Reflex™ Linked Brakes with ABS, providing a more stable and predictable chassis under heavy load.
Maintenance Guide: Keeping the Legend Alive
Lubrication System
For optimal thermal stability, MotoSpecsLab recommends using 3.8 Liters of H-D 360 20W50 motorcycle oil. If you frequently ride in high-ambient temperatures or heavy traffic, upgrading to Screamin’ Eagle SYN3 Full Synthetic is highly advised to protect the air-cooled V-Twin’s top end.
Electrical & Ignition
The 2014 Street Glide utilizes the 66010-97E battery, known for its high cold-cranking amps (CCA) required to turn over the 103ci engine. Ignition performance relies on Harley-Davidson 6R12 spark plugs. It is critical to verify the gap is set between 0.97 and 1.09 mm to ensure efficient combustion and prevent fouling.
Tires and Handling
Proper inflation is the most critical factor for the FLHX’s heavy-touring geometry. The 19-inch front wheel requires 2.48 bar (36 psi), while the 16-inch rear, which bears the majority of the luggage and passenger weight, must be maintained at 2.76 bar (40 psi). Under-inflation on this model leads to sluggish turn-in and premature cupping of the tread.
Expert Verdict
The 2014 Street Glide remains one of the most sought-after pre-owned touring bikes because it bridges the gap between classic analog feel and modern rider ergonomics. By following the strict maintenance parameters outlined above, owners can ensure the High Output 103 remains a reliable cross-country companion.