| Component | Specification |
|---|---|
| Model Range | 2011 – 2017 (Type 0135) |
| Engine Oil | SAE 15W-50 (API SJ / JASO MA2) – 2.3 Liters |
| Front Tire | 110/80 R19 59V (1.8 – 1.9 bar) |
| Rear Tire | 140/80 R17 69V (2.0 – 2.3 bar) |
| Battery | YB12AL-A |
| Spark Plugs | 2 x NGK DR8EB |
The BMW G 650 GS (Internal code 0135) holds a unique place in motorcycling history as the model that resurrected the legendary single-cylinder “Thumper” platform after BMW initially replaced it with the parallel-twin F-series. While the engine design originated from Rotax, this specific generation marked a shift in engineering logistics, with assembly outsourced to Loncin in China under BMW’s rigorous quality oversight—a move that paved the way for modern global manufacturing standards in high-end adventure bikes.
Engineering Analysis: The 652cc Single
The heart of the 0135 model is the liquid-cooled, dual-overhead-cam (DOHC) 652cc engine. Unlike its predecessors, this iteration refined the Dual Spark ignition system to meet stricter Euro 3 emission standards while maintaining exceptional fuel efficiency. The dry-sump lubrication system is a critical engineering feature, requiring a specific check procedure (at operating temperature) to ensure the 2.3-liter oil capacity is correctly managed.
Maintenance Essentials
1. Lubrication System
For the G 650 GS, BMW specifies SAE 15W-50 oil meeting API SJ and JASO MA2 standards. Because of the dry-sump design, overfilling is a common mistake. Always ensure the engine is fully warmed up before checking the sight glass on the oil tank (located near the faux fuel tank area).
2. Ignition & Electrical
Performance consistency on this single-cylinder relies heavily on the dual-plug system. The bike utilizes two NGK DR8EB spark plugs. Replacing these at recommended intervals is vital to prevent low-end hesitation and ensure smooth power delivery. The electrical system is supported by a YB12AL-A lead-acid battery; given the vibration inherent in single-cylinder engines, terminal tightness should be inspected every 5,000 km.
3. Chassis and Tires
The 0135 is designed for versatility. The 19-inch front and 17-inch rear configuration provides a balance between road stability and light off-road capability.
- Solo Riding: Front 1.8 bar (26 psi) / Rear 2.0 bar (29 psi)
- With Passenger/Luggage: Front 1.9 bar (28 psi) / Rear 2.3 bar (33 psi)
Proper inflation is critical for the longevity of the 110/80 R19 and 140/80 R17 tires, especially when transitioning between asphalt and gravel.
Conclusion
The BMW G 650 GS – 0135 remains a benchmark for reliability and accessibility in the adventure segment. By adhering to the 15W-50 oil specification and maintaining the dual-spark ignition system, owners can expect the longevity that has made the BMW “Thumper” a favorite for transcontinental travelers.