| Specification | Data Value |
|---|---|
| Production Years | 2008 – 2012 |
| Engine Capacity | 798cc (Parallel-Twin) |
| Engine Oil | SAE 15W-50, API SJ / JASO MA2 (2.9 L) |
| Spark Plug | NGK DCPR8E |
| Battery Type | YTX14-BS |
| Front Tire | 110/80 – 19 M/C 59H |
| Rear Tire | 140/80 – 17 M/C 69H |
Engineering Highlight: The Naming Paradox
A unique historical anomaly in BMW Motorrad’s history is that the BMW F 650 GS (0218) produced between 2008 and 2012 does not actually possess a 650cc engine. In a strategic move to differentiate its entry-level adventure tourer from the more off-road focused F 800 GS, BMW utilized the same 798cc parallel-twin Rotax-designed engine but detuned it for lower peak power and higher low-end accessibility. This allowed for a lower seat height and a more manageable power delivery for burgeoning adventure riders.
Maintenance Guide & Technical Insights
Lubrication System
For the 800cc parallel-twin, lubrication is critical for the longevity of the semi-dry sump system. MotoSpecsLab recommends a high-quality SAE 15W-50 oil meeting JASO MA2 standards to ensure wet-clutch compatibility. The total capacity is 2.9 liters including a filter change. Regular inspection of the oil level via the dipstick (with the engine at operating temperature) is essential.
Electrical & Ignition
The ignition system relies on NGK DCPR8E spark plugs. Given the engine’s compact head design, ensuring the correct gap and torque is vital to prevent misfires. The electrical system is anchored by a YTX14-BS battery, which provides the necessary cold-cranking amps for the high-compression twin cylinders.
Tires and Chassis Dynamics
The F 650 GS (Twin) utilizes a 19-inch front wheel, providing a stable balance between road manners and light gravel capability. Proper inflation is non-negotiable for handling precision:
- Front (110/80-19): 2.2 bar (31.9 psi) for solo riding; 2.5 bar (36.3 psi) for two-up or heavy luggage.
- Rear (140/80-17): 2.5 bar (36.3 psi) for solo riding; 2.9 bar (42.1 psi) for maximum load.
The MotoSpecsLab Verdict
The 2008-2012 BMW F 650 GS remains one of the most versatile ‘middleweight’ motorcycles ever produced. By sharing the 800cc architecture but offering a more street-oriented chassis, it provides a robust platform that is remarkably easy to maintain for the home mechanic. Adhering to the 15W-50 oil specification and maintaining precise tire pressures are the two most impactful actions an owner can take to preserve the bike’s legendary reliability.
Frequently Asked Questions
What is the oil change interval for this model?
BMW typically recommends a service every 10,000 km (6,000 miles), but for high-mileage or dusty conditions, MotoSpecsLab suggests intervals of 7,500 km.
Can I use a different spark plug?
While alternatives exist, the NGK DCPR8E is the factory-specified plug designed to match the heat range and reach required for this specific 798cc combustion chamber.