| Specification | Requirement / Value |
|---|---|
| Production Years | 2017 – 2018 |
| Engine Oil | SAE 5W-40 (API SL / JASO MA2) |
| Oil Capacity | 4.0 Liters |
| Tire Dimensions | F: 120/70 R 19 | R: 170/60 R 17 |
| Tire Pressure (Cold) | F: 2.5 bar (36 psi) | R: 2.9 bar (42 psi) |
| Battery Type | YTZ14S |
| Spark Plug | NGK LMAR8D-J |
The 2017-2018 BMW R 1200 GS Rallye (model code 0A51-RA) represents a pivotal moment in the evolution of the liquid-cooled Boxer. While many enthusiasts focus on the aesthetics, the engineering highlight of the Rallye variant was the introduction of the “Sport Suspension” option. This setup utilized increased spring rates and longer spring struts derived from the R 1200 GS Adventure, marking the first time the standard GS frame was factory-optimized for aggressive off-road damping without the bulk of the larger fuel tank.
Engineering & Powertrain Analysis
Under the Euro 4 mandate, the 0A51-RA received a revised catalytic converter and updated engine management (ECU mapping) to meet stricter emission standards without sacrificing the 125 hp output. For maintenance professionals, the choice of lubricant is critical. The 1,170cc Boxer requires 4.0 liters of SAE 5W-40. It is imperative to use oil meeting JASO MA2 standards to ensure the integrated wet clutch operates with the correct friction coefficient, preventing slippage under high torque loads.
Chassis & Dynamics
The Rallye’s handling characteristics are heavily dependent on precise tire pressure management. Equipped with a 120/70 R 19 front and a 170/60 R 17 rear, the factory recommends 2.5 bar (36 psi) and 2.9 bar (42 psi) respectively. Deviating from these pressures on the Telelever front-end can result in “cupping” or uneven wear, particularly during heavy braking cycles. The 0A51-RA chassis is designed to balance the agility of the standard GS with the ruggedness required for technical trails.
Electrical System & Ignition
The electrical heart of the Rallye is the YTZ14S battery, which provides the high cold-cranking amps (CCA) necessary to turn over the high-compression Boxer twin in cold climates. For ignition, the NGK LMAR8D-J spark plugs are specified. These long-reach plugs are essential for the dual-ignition system to ensure complete combustion and maintain the Euro 4 efficiency ratings. Periodic inspection of these plugs is vital for maintaining the smooth throttle transition the liquid-cooled models are known for.
Maintenance Summary
- Oil Change: Every 10,000 km (6,000 miles) or annually.
- Valve Clearance: Inspection recommended every 20,000 km.
- Final Drive: Oil replacement is critical to prevent premature wear of the shaft drive system.