Harley-Davidson X350 (353cc Parallel-Twin) — OEM Fluid, Tire Pressure & Maintenance Specs
353cc Liquid-Cooled Parallel-Twin DOHC 8-Valve (Unit Wet Clutch) · Source: Harley-Davidson X350 (353cc Parallel-Twin) (2023–Present) Official Owner’s Manual Maintenance Specifications
According to the Harley-Davidson X350 (353cc Parallel-Twin) (2023–Present) Official Owner’s Manual Maintenance Specifications, the 2023–Present Harley-Davidson X350 (353cc Parallel-Twin) (chassis X350/QJ350-13) requires 2.1 L (2.22 US qt) of SAE 10W-50 (JASO MA2, API SN / JASO MA2 Full Synthetic) engine oil for a drain-only change and 2.4 L (2.54 US qt) with filter service (HD 62700308 / HF554). Standard solo cold tire pressure is 220 kPa / 2.20 bar / 32 PSI front (120/70ZR17 58W) and 250 kPa / 2.50 bar / 36 PSI rear (160/60ZR17 69W), paired with 2× NGK CR8E spark plug(s) and a YTX9-BS battery.
Drain only: 2.1 L (2.22 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~297 km (185 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 10W-50 · JASO MA2 · API SN / JASO MA2 Full Synthetic |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 2.1 L (2.22 US qt) • With filter/strainer: 2.4 L (2.54 US qt) • Complete dry overhaul: 2.6 L (2.75 US qt) |
| OEM Oil Filter Code & Type | HD 62700308 / HF554 |
| Correct Oil Level Check Method | Hold bike upright on level ground 3–5 min after warm shutdown; read crankcase sight glass |
| Oil Drain Bolt Torque | 22 N·m (16.2 lb-ft / 2.24 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 120/70ZR17 58W · Rear: 160/60ZR17 69W (Tubeless) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 220 kPa / 2.20 bar / 32 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 220 kPa / 2.20 bar / 32 PSI Rear: 250 kPa / 2.50 bar / 36 PSI |
| OEM Spark Plug & Quantity | NGK CR8E × 2 (Gap: 0.7–0.8 mm) |
| OEM Battery Code & Rating | YTX9-BS (12V 8.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed O-Ring Chain — Check slack and lubricate every 1,000 km |
| Brake Fluid & Coolant | DOT 4 · OAT ethylene-glycol coolant for aluminum radiators (50:50 premix) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 353 cc · 36 hp @ 9,000 rpm · 31 N·m (22.9 lb-ft) @ 7,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 777 mm (30.6 in) · 195 kg (430 lbs) |
| Fuel Tank & Est. Real-World Range | 13.5 L (3.6 US gal) · ~22 km/L → ~297 km (185 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 5,000 km / 5,000 km • Air Filter / Spark Plug: 10,000 km / 12,000 km • Valve Clearance Check: 24,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
Styled after the legendary XR750 flat-tracker for riding academies and Asia-Pacific riders, the 195 kg X350 features a 41 mm inverted fork, dual petal front discs, and 520 chain final drive.
Oil & Clutch Mechanical Engineering Note
Revving to 9,000 rpm in a compact metric wet-sump parallel-twin crankcase, the X350 uses 2.4 L of SAE 10W-50 JASO MA2 verified upright via the sight glass.