BMW R 12 G/S (KR4) — OEM Fluid, Tire Pressure & Maintenance Specs
1,170cc Air/Oil-Cooled Boxer Twin DOHC 8-Valve (21-in Enduro) · Source: BMW R 12 G/S (KR4) (2025–Present) Official Owner’s Manual Maintenance Specifications
According to the BMW R 12 G/S (KR4) (2025–Present) Official Owner’s Manual Maintenance Specifications, the 2025–Present BMW R 12 G/S (KR4) (chassis KR4/0N41) requires 3.7 L (3.91 US qt) of SAE 15W-50 (JASO MA2, API SJ / BMW Advantec Pro 15W-50) engine oil for a drain-only change and 4 L (4.23 US qt) with filter service (11427673541 / HF164). Standard solo cold tire pressure is 220 kPa / 2.20 bar / 32 PSI front (90/90-21) and 250 kPa / 2.50 bar / 36 PSI rear (150/70 R17), paired with 4× NGK MAR8B-JDS / DCPR8EKC spark plug(s) and a YTX14-BS / BMW 14Ah AGM battery.
Drain only: 3.7 L (3.91 US qt)
R 250 kPa (2.50 bar)
Est. Range: ~304 km (189 mi)
1. Engine Lubrication, Filter & Clutch Specifications
| Clutch Architecture | Dry Single-Plate Manual Clutch (Separate Gearbox Oil) |
|---|---|
| Recommended Viscosity & Grade | SAE 15W-50 (Alt: SAE 20W-50) · JASO MA2 · API SJ / BMW Advantec Pro 15W-50 |
| Oil Volume (Drain / With Filter / Overhaul) |
• Drain only: 3.7 L (3.91 US qt) • With filter/strainer: 4 L (4.23 US qt) • Complete dry overhaul: 4.3 L (4.54 US qt) |
| OEM Oil Filter Code & Type | 11427673541 / HF164 |
| 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 | 32 N·m (23.6 lb-ft / 3.26 kgf·m) — Use fresh crush washer |
| Separate Transmission / Gearbox Oil | 800 ml (0.80 L) — SAE 75W-90 GL-5 (800 ml separate manual gearbox) |
| Final Drive / Bevel Gear Oil | 180 ml (0.18 L) — SAE 75W-90 Hypoid Axle Oil (180 ml Paralever bevel drive) |
2. Cold Tire Pressures, Wheels, Ignition & Drivetrain
| Front / Rear OEM Tire Sizes | Front: 90/90-21 · Rear: 150/70 R17 (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: 240 kPa / 2.40 bar / 35 PSI Rear: 290 kPa / 2.90 bar / 42 PSI |
| OEM Spark Plug & Quantity | NGK MAR8B-JDS / DCPR8EKC × 4 (Gap: 0.8 mm) |
| OEM Battery Code & Rating | YTX14-BS / BMW 14Ah AGM (12V 14.0Ah MF AGM) |
| Final Drive Maintenance | Cardan Shaft Final Drive — Replace rear bevel-gear hypoid oil at exact measured volume |
| Brake Fluid & Coolant | DOT 4 · Air/Oil-Cooled Engine (No liquid coolant) |
3. Ergonomics, Range & Scheduled Service Intervals
| Displacement · Max Power · Peak Torque | 1170 cc · 109 hp @ 7,000 rpm · 115 N·m (84.8 lb-ft) @ 6,500 rpm |
|---|---|
| Seat Height & Wet Curb Weight | 860 mm (33.9 in) · 229 kg (505 lbs) |
| Fuel Tank & Est. Real-World Range | 15.5 L (4.1 US gal) · ~19.6 km/L → ~304 km (189 mi) |
| OEM Scheduled Maintenance Intervals |
• First Break-In: 1,000 km • Engine Oil / Filter: 10,000 km / 10,000 km • Air Filter / Spark Plug: 20,000 km / 20,000 km • Valve Clearance Check: 10,000 km |
4. Generation Cutoffs & Real-World Wrenching Gotchas
Model-Year & Chassis Generation Notes
True off-road-capable 2025 KR4 heritage enduro upgrading over the old Urban G/S with a 21-inch front wheel and fully adjustable 210/200 mm long-travel suspension.
Oil & Clutch Mechanical Engineering Note
BMW air/oil-cooled Boxer platform (R 1150, K25 R 1200, R nineT family, R 12, R 18) featuring an automotive dry single-plate clutch with separate engine, gearbox, and shaft bevel oils.