Sun Coast Cycle Sports stocks inspected used parts for the 2021 and newer Harley-Davidson FXBBS Street Bob 114 powered by the Milwaukee-Eight 114 engine (1868cc). This larger-displacement Street Bob continues on the Softail platform introduced in 2018, offering increased torque over the previous 107ci version. Each component we list from our Florida salvage operation receives individual inspection, dedicated photography, and unique SKU assignment before listing with complimentary continental U.S. shipping.
Street Bob FXBBS 114ci generation and parts compatibility
The FXBBS replaced the FXBB as the standard Street Bob configuration starting in 2021. The primary change is the displacement increase from 107ci to 114ci, achieved through a larger cylinder bore. The chassis remains the same 2018+ Softail platform.
| Model | Years | Engine | Bore |
|---|
| FXBB Street Bob | 2018-2020 | Milwaukee-Eight 107 (1753cc) | 3.937 in |
| FXBBS Street Bob | 2021-present | Milwaukee-Eight 114 (1868cc) | 4.016 in |
The 2021+ FXBBS benefits from refinements made throughout the Milwaukee-Eight Softail production run, including the updated oil pump design that addressed the sumping issues found on early 2018-2019 models. By the time the FXBBS debuted, these concerns had been resolved in the manufacturing process.
The Milwaukee-Eight 114 shares its architecture with the 107, meaning external engine components including exhaust systems, air cleaners, cam covers, and derby covers interchange between displacements. Internal components including pistons, cylinders, and cylinder heads are specific to each displacement due to the different bore sizes. The 114 engine is also used in the FXFBS Fat Bob 114, FXLRS Low Rider S, and FXLRST Low Rider ST.
All 2018+ Softail models share the same chassis platform. Frame, swingarm, suspension components, and most hardware interchange regardless of engine displacement or model variant.
Common Street Bob FXBBS 114ci failure points and replacement parts
Compensator noise: The Milwaukee-Eight compensator can develop a clunking sound on deceleration, particularly noticeable at low speeds and when engine braking. This is inherent to the design rather than a defect, as the compensator absorbs drivetrain shock. Aftermarket hydraulic compensators can reduce this noise for riders who find it objectionable.
Isolated lifter noise reports: Some owners report hydraulic lifter tick, typically more audible when the engine is cold. In most cases this is within normal operating parameters and quiets as the engine reaches operating temperature. Persistent noise at operating temperature warrants inspection.
Oil consumption within specification: Harley-Davidson considers oil consumption up to 1 quart per 2,500 miles within normal parameters for the Milwaukee-Eight engine. Some riders find this higher than expected compared to previous engine generations. Regular oil level checks are recommended.
Heat management: The solid-mount Milwaukee-Eight can transfer more heat to the rider than rubber-mounted configurations. This is particularly noticeable in slow traffic or hot weather. Aftermarket heat shields and deflectors are popular accessories.
Commonly replaced Street Bob FXBBS 114ci parts
- Compensator assembly
- Exhaust system and heat shields
- Handlebars and risers
- Seats and passenger pegs
- Forward controls
- Air cleaner assemblies
- Brake pads and rotors
- Turn signals and lighting
Frequently asked questions
Q: What is the difference between the FXBB 107 and FXBBS 114 Street Bob?
The primary difference is engine displacement. The FXBBS 114 uses larger 4.016-inch bore cylinders compared to the FXBB's 3.937-inch bore, increasing displacement from 1753cc to 1868cc. This provides approximately 10% more torque. The chassis, frame, suspension, wheels, and bodywork are identical between the two models. Most accessories and external engine components interchange, but internal engine parts (pistons, cylinders, heads) are specific to each displacement.
Q: Did the 2021+ FXBBS have the oil sumping problems seen on earlier M8 Softails?
No. The oil sumping issue primarily affected 2018 and early 2019 production Milwaukee-Eight Softails. Harley-Davidson updated the oil pump assembly and primary case venting before the FXBBS 114 debuted in 2021. All FXBBS models left the factory with the revised components already installed.
Q: Can I use FXLRS Low Rider S or FXFBS Fat Bob engine parts on my FXBBS Street Bob?
Yes, within the same displacement. The Milwaukee-Eight 114 is shared across the FXBBS Street Bob, FXFBS Fat Bob, FXLRS Low Rider S, and FXLRST Low Rider ST. Engine internals, cams, oil pumps, and cylinder head components interchange between these models. External components including exhaust, air cleaners, and covers also interchange. Model-specific differences are limited to tune settings and cosmetic items.
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