Harley-Davidson Fat Bob 114 (FXFBS Softail) — OEM Fluid, Tire Pressure & Maintenance Specs
1,868cc Air/Oil-Cooled Dual-Counterbalanced 45° V-Twin Milwaukee-Eight 114 · Source: Harley-Davidson Fat Bob 114 (FXFBS Softail) (2018–2023) Official Owner’s Manual Maintenance Specifications
According to the Harley-Davidson Fat Bob 114 (FXFBS Softail) (2018–2023) Official Owner’s Manual Maintenance Specifications, the 2018–2023 Harley-Davidson Fat Bob 114 (FXFBS Softail) (chassis FXFBS) requires 4.3 L (4.54 US qt) of SAE 20W-50 (JASO MA2, Screamin’ Eagle SYN3 20W-50 / H-D 360 20W-50) engine oil for a drain-only change and 4.7 L (4.97 US qt) with filter service (HD 62700296 / 62700297 (HF171C)). Standard solo cold tire pressure is 248 kPa / 2.48 bar / 36 PSI front (150/80-16 71H) and 276 kPa / 2.76 bar / 40 PSI rear (180/70B16 77H), paired with 4× HD 6R10 (31600012 Dual-Plug M8) spark plug(s) and a YTX20HL-BS / HD 65989-97E battery.
Drain only: 4.3 L (4.54 US qt)
R 276 kPa (2.76 bar)
Est. Range: ~248 km (154 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 20W-50 · JASO MA2 · Screamin’ Eagle SYN3 20W-50 / H-D 360 20W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 4.3 L (4.54 US qt) • With filter/strainer: 4.7 L (4.97 US qt) • Complete dry overhaul: 5.2 L (5.49 US qt) |
| OEM Oil Filter Code & Type | HD 62700296 / 62700297 (HF171C) |
| Correct Oil Level Check Method | At full operating temperature resting ON THE SIDESTAND (Jiffy Stand); thread dipstick in to read |
| Oil Drain Bolt Torque | 24 N·m (17.7 lb-ft / 2.45 kgf·m) — Use fresh crush washer |
| Primary Chaincase Fluid | 1065 ml (1.06 L) — H-D Formula+ Primary & Clutch Fluid (900–1,065 ml wet refill) |
| Separate Transmission / Gearbox Oil | 828 ml (0.83 L) — H-D Formula+ or Heavy Synthetic Gear Oil 80W-140 (828 ml / 28 oz) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 150/80-16 71H · Rear: 180/70B16 77H (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 248 kPa / 2.48 bar / 36 PSI Rear: 276 kPa / 2.76 bar / 40 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 248 kPa / 2.48 bar / 36 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | HD 6R10 (31600012 Dual-Plug M8) × 4 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTX20HL-BS / HD 65989-97E (12V 18.0Ah Heavy-Duty AGM) |
| Final Drive Maintenance | Carbon/Aramid Reinforced Secondary Belt — Inspect belt deflection and pulley debris |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 1868 cc · 94 hp @ 5,020 rpm · 155 N·m (114.3 lb-ft) @ 3,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 710 mm (28.0 in) · 306 kg (675 lbs) |
| Fuel Tank & Est. Real-World Range | 13.6 L (3.6 US gal) · ~18.2 km/L → ~248 km (154 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,600 km • Engine Oil / Filter: 8,000 km / 8,000 km • Air Filter / Spark Plug: 24,000 km / 48,000 km • Valve Clearance Check: 48,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Transitioning from Dyna to the Softail chassis in 2018, the FXFBS wears a rectangular LED headlamp, 43 mm inverted fork, dual front discs, 2-1-2 upswept exhaust, and fat 16-inch tires.
Oil & Clutch Mechanical Engineering Note
As an aggressive cornering muscle cruiser, the FXFBS benefits from full-synthetic SAE 20W-50 in its 4.7 L dry-sump engine circuit and proper clicks on its external rear preload knob.
Garage Wrenching Gotchas
- The wide 150/80-16 front tire scallops rapidly and turns heavy if cold pressure sags below 36 PSI (248 kPa); check front tire pressure every two weeks.
- The upswept 2-1-2 exhaust heat shields sit close to the rear master cylinder; wait until pipes cool completely and drape fender covers before bleeding DOT 4 fluid.
5. Frequently Asked Questions (FAQ)
How are engine and separate drivetrain fluid capacities split on the Harley-Davidson Fat Bob 114 (FXFBS Softail)?
The engine sump takes 4.3 L drain-only and 4.7 L (4.97 US qt) with filter (HD 62700296 / 62700297 (HF171C)) of SAE 20W-50 (JASO MA2), while isolated drivetrain cavities (primary chaincase 1065 ml, separate gearbox 828 ml) require dedicated gear/chaincase fluid.
How do you accurately check the oil level on the Fat Bob 114 (FXFBS Softail), and what are its service intervals?
Bring the engine to full operating temperature and check the Full Hot mark with the motorcycle resting on its sidestand (Jiffy Stand) on level pavement—measuring upright leads to crankcase overfill and breather blow-by. Torque the drain plug to 24 N·m with a new crush washer. Factory oil change intervals are every 8,000 km, with valve clearance inspection every 48,000 km.
What are the cold tire pressures, puncture repair type, seat height, and range of the Fat Bob 114 (FXFBS Softail)?
Fitted with 150/80-16 71H front and 180/70B16 77H rear tubeless rims (compatible with roadside plug kits), set cold tire pressures to 36 / 40 PSI (248/276 kPa) solo or 36 / 42 PSI loaded. Seat height is 710 mm (28.0 in) at 306 kg wet weight, delivering ~248 km per 13.6 L tank.