| Specification | Data |
|---|---|
| Model Variant | BMW R 1250 RS – 0M81 |
| Production Years | 2019 – Present |
| Engine Oil | SAE 5W-40, API SL / JASO MA2 (4.0 L) |
| Spark Plug | NGK LMAR8AI-10 |
| Battery Type | YTX14-BS |
| Tire Dimensions | F: 120/70 ZR 17 / R: 180/55 ZR 17 |
| Tire Pressure | F: 2.5 bar / R: 2.9 bar |
The BMW R 1250 RS (0M81) represents a pivotal moment in the evolution of the Boxer-twin. It was the first sport-touring platform to integrate BMW’s ShiftCam Technology. This engineering breakthrough utilizes a dual-profile intake camshaft that shifts between partial-load and full-load cams, allowing the engine to deliver smooth, fuel-efficient performance at low RPMs while unleashing 136 hp and 143 Nm of torque when the throttle is pinned.
Technical Engineering & Performance
At the heart of the 0M81 is the 1254cc air/liquid-cooled twin-cylinder engine. Unlike its predecessors, the ShiftCam system varies valve timing and valve stroke on the intake side. This results in a significantly flatter torque curve, making the RS an exceptionally versatile machine for both aggressive mountain carving and long-distance high-speed cruising. The 0M81 chassis remains a paragon of stability, utilizing the engine as a stressed member and featuring the paralever rear suspension for anti-squat characteristics during hard acceleration.
Maintenance & Service Specifications
To maintain the high-tolerance components of the ShiftCam system, strict adherence to fluid specifications is mandatory. For the 0M81, MotoSpecsLab recommends an oil change every 10,000 km (6,000 miles) or annually.
Fluid & Component Requirements
- Engine Oil: The system requires 4.0 liters of SAE 5W-40. It is critical to use oil meeting API SL and JASO MA2 standards to ensure the wet clutch operates without slippage.
- Spark Plugs: The NGK LMAR8AI-10 is the specified iridium plug, chosen for its ability to withstand the high-compression environment of the 1250 Boxer.
- Electrical: The YTX14-BS battery provides the necessary cold-cranking amps (CCA) to turn over the large twin cylinders.
Chassis & Tire Data
The R 1250 RS is sensitive to tire pressure fluctuations. For optimal handling and to prevent uneven wear on the 120/70 and 180/55 ZR 17 tires, pressures must be maintained at 2.5 bar (36.3 psi) front and 2.9 bar (42.1 psi) rear. Deviating from these specs can significantly degrade the feedback provided by the front end in corners.
MotoSpecsLab Verdict
The BMW R 1250 RS – 0M81 is more than a simple update; it is a masterclass in modern internal combustion engineering. By balancing the raw character of the Boxer engine with the precision of ShiftCam technology, BMW has created a sport-tourer that demands minimal maintenance while providing maximum mechanical engagement.
Frequently Asked Questions
Q: How often should I check the valve clearance on the 0M81?
A: BMW recommends checking valve clearances every 20,000 km (12,000 miles). Due to the ShiftCam mechanism, this should be performed by a technician with specialized tools.
Q: Can I use 10W-40 oil?
A: While 10W-40 may be used in emergency situations, 5W-40 is the factory-specified weight to ensure rapid lubrication of the ShiftCam actuators during cold starts.