The BMW R 90-6 motorcycle specifications include a 898 cc (54.80 cu in) engine, power of 60 hp (43.8 kW) @ 6,500 rpm, a 5-speed gearbox, and a listed weight of 227 kg (500.4 lb).
Key specifications
The 1973 model is treated as the standard specification. Only later model years with a different supplied value are shown below.
How the BMW R 90-6 compares
This compares the motorcycle with all BMW models in this specifications database. The blue marker is this model and the grey line is the BMW database average.
About 26% lower than the BMW database average. Around the 42nd percentile across BMW models.
Very close to the BMW database average. Around the 51st percentile across BMW models.
Very close to the BMW database average. Around the 54th percentile across BMW models.
About 6% smaller than the BMW database average. Around the 51st percentile across BMW models.
BMW database percentile rankings
Percentiles show where this motorcycle sits across the BMW specifications database. They are descriptive database rankings, not performance ratings.
60 hp — more powerful than about 42% of BMW models with power data.
898 cc — larger displacement than about 51% of BMW models.
227 kg — heavier than about 54% of BMW models, or lighter than about 46%.
18 L — larger than about 51% of BMW fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 3.25-19 |
|---|---|
| Rear tire size | 4.00-18 |
| Power-to-weight ratio | 0.264 hp/kg |
| Power-to-weight | 264.3 hp/tonne |
| Specific power | 66.8 hp/L |
| Bore/stroke ratio | 1.27:1 (Oversquare) |
Engine specifications
| Engine type | Two cylinder boxer, four-stroke |
|---|---|
| Displacement | 898 cc (54.80 cu in) |
| Power | 60 hp (43.8 kW) @ 6,500 rpm |
| Bore × stroke | 90.0 x 70.6 mm (3.5 x 2.8 inches) |
| Compression ratio | 9.0:1 |
| Valves per cylinder | 2 |
| Cooling system | Air |
| Fuel control | Overhead Valves (OHV) |
Transmission and drivetrain
| Gearbox | 5-speed |
|---|---|
| Final drive | Shaft drive (cardan) (final drive) |
Brakes, wheels and tires
| Front brakes | Single disc |
|---|---|
| Rear brakes | Expanding brake |
| Front tire | 3.25-19 |
| Rear tire | 4.00-18 |
Dimensions and weight
| Wet weight | 227 kg (500.4 lb) |
|---|
Fuel and emissions
| Fuel capacity | 18.00 L (4.76 US gal) |
|---|
Performance
| Top speed | 184.0 km/h (114.3 mph) |
|---|
Disclaimer: Specifications may vary by market, trim, production date and optional equipment, and scraped or historical data can contain errors. Comparison and percentile values are calculated from BMW models in this specifications database. Always double-check important specifications against the motorcycle owner’s/service manual and official BMW information before relying on them. Visit the official BMW website.