KTM 390 Adventure R (2025 LC4c) — OEM Fluid, Tire Pressure & Maintenance Specs
398.7cc Liquid-Cooled Single DOHC 4-Valve LC4c (21/18 Spoke) · Source: KTM 390 Adventure R (2025 LC4c) (2025–Present) Official Owner’s Manual Maintenance Specifications
According to the KTM 390 Adventure R (2025 LC4c) (2025–Present) Official Owner’s Manual Maintenance Specifications, the 2025–Present KTM 390 Adventure R (2025 LC4c) (chassis VBKJPJ45/LC4c-399R) requires 1.5 L (1.59 US qt) of SAE 15W-50 (JASO MA2, Motorex Formula / Power Synt 4T 15W-50) engine oil for a drain-only change and 1.7 L (1.80 US qt) with filter service (90138015000 / HF155). Standard solo cold tire pressure is 200 kPa / 2.00 bar / 29 PSI front (90/90-21) and 200 kPa / 2.00 bar / 29 PSI rear (140/80-18), paired with 1× Bosch VR6NEU / NGK LKAR8AI-9 spark plug(s) and a YTX9-BS / ETZ9-BS battery.
Drain only: 1.5 L (1.59 US qt)
R 200 kPa (2.00 bar)
Est. Range: ~399 km (248 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Wet Multi-Plate Manual Clutch NEVER use JASO MB |
|---|---|
| Recommended Viscosity & Grade | SAE 15W-50 · JASO MA2 · Motorex Formula / Power Synt 4T 15W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 1.5 L (1.59 US qt) • With filter/strainer: 1.7 L (1.80 US qt) • Complete dry overhaul: 1.9 L (2.01 US qt) |
| OEM Oil Filter Code & Type | 90138015000 / HF155 |
| 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 | 20 N·m (14.8 lb-ft / 2.04 kgf·m) — Use fresh crush washer |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 90/90-21 · Rear: 140/80-18 (Tube-Type Spoke Rim) |
|---|---|
| Cold Tire Pressure — Solo Riding |
Front: 200 kPa / 2.00 bar / 29 PSI Rear: 200 kPa / 2.00 bar / 29 PSI |
| Cold Tire Pressure — 2-Up / Loaded Touring |
Front: 220 kPa / 2.20 bar / 32 PSI Rear: 240 kPa / 2.40 bar / 35 PSI |
| OEM Spark Plug & Quantity | Bosch VR6NEU / NGK LKAR8AI-9 × 1 (Gap: 0.8–0.9 mm) |
| OEM Battery Code & Rating | YTX9-BS / ETZ9-BS (12V 8.0Ah MF AGM) |
| Final Drive Maintenance | 520 Sealed X-Ring Chain — Maintain 25–35 mm slack and clean/lubricate regularly |
| 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 | 399 cc · 45 hp @ 8,500 rpm · 39 N·m (28.8 lb-ft) @ 7,000 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 870 mm (34.3 in) · 176 kg (388 lbs) |
| Fuel Tank & Est. Real-World Range | 14 L (3.7 US gal) · ~28.5 km/L → ~399 km (248 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 7,500 km / 7,500 km • Air Filter / Spark Plug: 15,000 km / 15,000 km • Valve Clearance Check: 15,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
True rally-styled 2025 overhaul introducing the 398.7cc LC4c engine, 21/18-inch wire-spoke wheels, and 230 mm travel fully adjustable WP APEX/XPLOR suspension.
Oil & Clutch Mechanical Engineering Note
KTM/Husqvarna lightweight DOHC single (125–390 Duke/RC/ADV & 401 Pilen) requiring SAE 15W-50 JASO MA2 synthetic oil and mesh oil-screen cleaning.