Harley-Davidson Dyna Street Bob 103 (FXDB Twin Cam) — OEM Fluid, Tire Pressure & Maintenance Specs
1,690cc Air-Cooled 45° V-Twin Rubber-Mounted Twin Cam 103 · Source: Harley-Davidson Dyna Street Bob 103 (FXDB Twin Cam) (2013–2017) Official Owner’s Manual Maintenance Specifications
According to the Harley-Davidson Dyna Street Bob 103 (FXDB Twin Cam) (2013–2017) Official Owner’s Manual Maintenance Specifications, the 2013–2017 Harley-Davidson Dyna Street Bob 103 (FXDB Twin Cam) (chassis FXDB) requires 2.4 L (2.54 US qt) of SAE 20W-50 (JASO MA2, H-D 360 SAE 20W-50 / SYN3) engine oil for a drain-only change and 2.8 L (2.96 US qt) with filter service (HD 63798-99A / 63731-99A (HF171C)). Standard solo cold tire pressure is 207 kPa / 2.07 bar / 30 PSI front (100/90B19 57H) and 276 kPa / 2.76 bar / 40 PSI rear (160/70B17 73V), paired with 2× HD 6R12 (32362-04A) spark plug(s) and a YTX20HL-BS / YIX30L-BS battery.
Drain only: 2.4 L (2.54 US qt)
R 276 kPa (2.76 bar)
Est. Range: ~324 km (201 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 · H-D 360 SAE 20W-50 / SYN3 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.4 L (2.54 US qt) • With filter/strainer: 2.8 L (2.96 US qt) • Complete dry overhaul: 3.3 L (3.49 US qt) |
| OEM Oil Filter Code & Type | HD 63798-99A / 63731-99A (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 | 950 ml (0.95 L) — H-D Formula+ Primary Fluid (1,120 ml / 38 oz) |
| Separate Transmission / Gearbox Oil | 830 ml (0.83 L) — H-D Formula+ or SAE 80W-140 Gear Oil (830 ml / 28 oz) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 100/90B19 57H · Rear: 160/70B17 73V (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 276 kPa / 2.76 bar / 40 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 207 kPa / 2.07 bar / 30 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | HD 6R12 (32362-04A) × 2 (Gap: 0.97–1.09 mm) |
| OEM Battery Code & Rating | YTX20HL-BS / YIX30L-BS (12V 18–28Ah 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 | 1690 cc · 76 hp @ 5,010 rpm · 130 N·m (95.9 lb-ft) @ 3,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 675 mm (26.6 in) · 304 kg (670 lbs) |
| Fuel Tank & Est. Real-World Range | 17.8 L (4.7 US gal) · ~18.2 km/L → ~324 km (201 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 / 32,000 km • Valve Clearance Check: 48,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Following 2006 TC88 and 2007–2012 TC96 runs, the 2013–2017 FXDB paired the 1,690cc Twin Cam 103 with exposed twin shocks, a 17.8 L tank, mini-apes, and laced wheels.
Oil & Clutch Mechanical Engineering Note
Unbalanced and rubber-mounted in the Dyna frame, the Twin Cam 103 isolates 2.8 L of SAE 20W-50 engine oil from 950 ml of primary fluid and 830 ml of 6-speed Cruise Drive gear oil.
Garage Wrenching Gotchas
- Spilled filter oil ruins the front rubber isolator mount on Dyna frames and triggers high-speed chassis weave; shield the front motor mount completely before spinning off HF171C.
- Stock black steel laced wheels require inner tubes and rim strips; tap-test spoke tension regularly and install fresh tubes whenever mounting new tires.
5. Frequently Asked Questions (FAQ)
How are engine and separate drivetrain fluid capacities split on the Harley-Davidson Dyna Street Bob 103 (FXDB Twin Cam)?
The engine sump takes 2.4 L drain-only and 2.8 L (2.96 US qt) with filter (HD 63798-99A / 63731-99A (HF171C)) of SAE 20W-50 (JASO MA2), while isolated drivetrain cavities (primary chaincase 950 ml, separate gearbox 830 ml) require dedicated gear/chaincase fluid.
How do you accurately check the oil level on the Dyna Street Bob 103 (FXDB Twin Cam), 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 Dyna Street Bob 103 (FXDB Twin Cam)?
Equipped with 100/90B19 57H front and 160/70B17 73V rear tube-type rims (mushroom/string plugs will not seal—carry spare inner tubes), set cold tire pressures to 30 / 40 PSI (207/276 kPa) solo or 30 / 42 PSI loaded. Seat height is 675 mm (26.6 in) at 304 kg wet weight, delivering ~324 km per 17.8 L tank.