| Specification | Data |
|---|---|
| Engine | Twin Cam 103 (1690cc) Air-cooled |
| Oil Capacity | 2.8 L (SAE 20W-50) |
| Front Tire | 100/90B19 57H |
| Rear Tire | 160/70B17 73V |
| Spark Plug | 6R12 |
| Battery | 65989-97D |
The 2017 Harley-Davidson FXDB Street Bob holds a unique place in motorcycling history as the final iteration of the Dyna platform before its controversial merger into the Softail line in 2018. The FXDB/17 represents the pinnacle of the rubber-mounted engine design, specifically engineered to meet stringent Euro 4 emissions standards while retaining the raw, mechanical character of the Twin Cam 103 powertrain.
Engineering Overview: The Euro 4 Twin Cam 103
The 2017 model year was a transitional period. To meet Euro 4 compliance, Harley-Davidson refined the fuel mapping and exhaust catalysis on the 103 cubic-inch (1690cc) engine. Despite these restrictions, the FXDB/17 delivers robust torque through a 6-speed Cruise Drive transmission. The Dyna chassis remains prized for its dual external rear shocks, offering a traditional aesthetic and a predictable, feedback-rich handling profile that modern monoshock designs often mask.
Critical Maintenance Guide
Lubrication System
For the High Output Twin Cam 103, oil quality is paramount for thermal management. The system requires 2.8 Liters of SAE 20W-50. MotoSpecsLab recommends using H-D 360 for standard intervals or Syn3 Full Synthetic for riders in hotter climates or those frequenting heavy traffic, as synthetic oils provide superior shear stability at high operating temperatures.
Tire & Chassis Management
The FXDB/17 utilizes a specific 19-inch front and 17-inch rear wheel combination. Maintaining precise tire pressure is critical for preventing the ‘Dyna wobble’—a high-speed instability sometimes associated with the rubber-mount system.
- Front (100/90B19 57H): 2.06 bar (30 psi)
- Rear (160/70B17 73V): 2.62 bar (38 psi) Solo / 2.75 bar (40 psi) Max Load
Checking the rear swingarm bushings and engine mounts every 10,000 miles is recommended to ensure the rubber-mount isolation remains effective.
Electrical & Ignition
The 2017 Street Bob utilizes the 65989-97D battery. Given the high-compression nature of the 103 engine, a battery with strong Cold Cranking Amps (CCA) is required. For ignition, the 6R12 spark plugs should be inspected for carbon fouling, particularly on Euro 4 models which may run leaner fuel mixtures at idle.
MotoSpecsLab Verdict
The FXDB/17 Street Bob is more than just a cruiser; it is a collectible piece of engineering. It offers the purest connection to the Dyna heritage with the benefit of modern EFI and ABS refinements. For owners, meticulous adherence to the 2.8L oil capacity and specific tire pressures is the key to preserving the legendary ride quality of this final-run Dyna.