| Component | Specification |
|---|---|
| Engine Oil | SAE 20W-50 (2.8 L) |
| Front Tire | 130/60B21 63H (2.5 bar / 36 psi) |
| Rear Tire | 240/40R18 79V (2.9 bar / 42 psi) |
| Battery | 65989-97D |
| Spark Plug | Harley-Davidson 6R12 |
The Harley-Davidson Breakout FXSB/17 stands as a pinnacle of the “Gasser” era of modern cruisers. A unique engineering highlight of this specific model is its offset drivetrain; to accommodate the massive 240mm rear tire while maintaining balance, Harley-Davidson engineers had to precisely offset the primary drive and transmission, ensuring the bike tracked straight despite its asymmetrical rear-end geometry.
Engineering Overview: The Euro 4 Transition
The 2017 model year marked a critical juncture for the FXSB. As the final iteration before the Softail platform underwent a total redesign in 2018, the FXSB/17 had to meet stringent Euro 4 emission standards. This was achieved through refined EFI mapping and enhanced catalytic converters within the staggered exhaust system. Powering this beast is the Twin Cam 103B engine, featuring internal counterbalancers to mitigate the vibrations inherent in a rigid-mounted engine within the Softail frame.
Maintenance Protocol
1. Lubrication System
The High Output Twin Cam 103B requires high-thermal-stability lubricants. At MotoSpecsLab, we recommend a full synthetic SAE 20W-50. The dry-sump system holds 2.8 liters. It is imperative to check the oil level when the engine is at operating temperature to avoid overfilling, which can lead to oil carry-over into the air cleaner.
2. Rolling Chassis & Tires
The handling characteristics of the Breakout are defined by its 21-inch front and 18-inch rear wheel combination. Due to the significant width of the 240/40R18 rear tire, maintaining precise pressure is non-negotiable for cornering stability. Running below 2.9 bar (42 psi) will cause sluggish turn-in and accelerated “cupping” of the tread.
3. Electrical System
The FXSB/17 utilizes the 65989-97D AGM battery. Given the high-compression nature of the 103ci engine, a battery with strong Cold Cranking Amps (CCA) is required. For ignition, the factory-spec 6R12 spark plugs remain the gold standard for preventing pre-detonation under heavy load.
Editor’s Verdict
The FXSB/17 is more than a drag-inspired showpiece; it is a masterclass in packaging. While the long rake and wide rear tire require a deliberate counter-steering effort, the mechanical reliability of the final-year Twin Cam makes it a highly sought-after specimen for collectors and enthusiasts alike. Proper adherence to the 2.8L oil capacity and 42 psi rear tire pressure is the key to preserving the ride quality of this iconic machine.