| Component | Specification |
|---|---|
| Production Years | 2017–2020 |
| Engine Oil | SAE 20W50 (3.1 L) |
| Front Tire | 100/80-17 M/C 52H |
| Rear Tire | 140/75 R15 M/C 67H |
| Tire Pressure (F/R) | 2.5 bar (36 psi) / 2.8 bar (40 psi) |
| Battery Model | 66000171 |
| Spark Plug | HD-6R10 |
Engineering Highlight: The Harley-Davidson Street 750 (XG750) represented a radical departure from Milwaukee tradition, featuring the Revolution X engine. This 60-degree V-Twin was the first liquid-cooled powertrain from Harley-Davidson since the V-Rod, specifically engineered to manage the high thermal loads of stop-and-go urban environments while meeting stringent Euro 4 emissions standards.
Technical Overview: The Euro 4 Evolution
The 2017 update (XG750/17) was pivotal for the Street 750 series. To comply with Euro 4 regulations, Harley-Davidson refined the fuel injection mapping and exhaust catalysis. More importantly, this era saw the standard inclusion of ABS and a significant upgrade to the braking system—addressing the primary criticism of the 2014-2016 models. The chassis remains a lean, narrow frame designed for lane-splitting and low-speed maneuverability.
Maintenance Criticals
Engine Lubrication
The Revolution X engine is a high-revving unit compared to traditional air-cooled Big Twins. It requires 3.1 Liters of SAE 20W50. At MotoSpecsLab, we recommend synthetic blends to better handle the shear forces in the integrated transmission and wet clutch system.
Ignition and Electrical
Reliability in the Euro 4 models is bolstered by the HD-6R10 spark plugs. Given the urban focus of this bike, carbon fouling can occur if the bike is only used for short trips. Ensure the 66000171 battery is kept on a tender if the bike is not ridden weekly, as the security system can create a parasitic draw.
Tires and Contact Patch
The XG750 uses a unique 17-inch front and 15-inch rear wheel combination. Maintaining the specific pressures of 36 psi (Front) and 40 psi (Rear) is vital for preserving the bike’s tip-in characteristics and preventing ‘cupping’ on the rear tire under heavy acceleration.
Editor’s Verdict
The Street 750 XG750/17 is a misunderstood masterpiece of urban engineering. While purists may miss the air-cooled vibration, the Euro 4 Street 750 offers a level of thermal stability and braking confidence that makes it the superior choice for modern city riders. Proper adherence to the 3.1L oil capacity and tire pressure specs ensures this liquid-cooled platform will easily surpass the 50,000-mile mark.