The BMW R65 (reduced effect) motorcycle specifications include a 649 cc (39.60 cu in) engine, power of 27 hp (19.7 kW) @ 5,500 rpm, a 5-speed gearbox, and a listed weight of 205 kg (451.9 lb).
Key specifications
How the BMW R65 (reduced effect) 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 67% lower than the BMW database average. Around the 15th percentile across BMW models.
About 29% lower than the BMW database average. Around the 23rd percentile across BMW models.
About 10% lighter than the BMW database average. Around the 34th percentile across BMW models.
About 14% larger than the BMW database average. Around the 77th 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.
27 hp — more powerful than about 15% of BMW models with power data.
649 cc — larger displacement than about 23% of BMW models.
205 kg — heavier than about 34% of BMW models, or lighter than about 66%.
22 L — larger than about 77% of BMW fuel tanks in this database.
Mechanical overview
Additional useful specifications
| Front tire size | 90/90-18 |
|---|---|
| Rear tire size | 120/90-18 |
| Front tire width | 90 mm |
| Front tire aspect ratio | 90% |
| Front rim diameter | 18 in |
| Rear tire width | 120 mm |
| Rear tire aspect ratio | 90% |
| Rear rim diameter | 18 in |
| Power-to-weight ratio | 0.132 hp/kg |
| Power-to-weight | 131.7 hp/tonne |
| Specific power | 41.6 hp/L |
| Bore/stroke ratio | 1.33:1 (Oversquare) |
Model information
| Year released | 1985 |
|---|---|
| Category | Naked bike |
Engine specifications
| Engine type | Two cylinder boxer, four-stroke |
|---|---|
| Displacement | 649 cc (39.60 cu in) |
| Power | 27 hp (19.7 kW) @ 5,500 rpm |
| Bore × stroke | 82.0 x 61.5 mm (3.2 x 2.4 inches) |
| Compression ratio | 8.4:1 |
| 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 | 90/90-18 |
| Rear tire | 120/90-18 |
Dimensions and weight
| Wet weight | 205 kg (451.9 lb) |
|---|
Fuel and emissions
| Fuel capacity | 22.00 L (5.81 US gal) |
|---|
Performance
| Top speed | 147.0 km/h (91.3 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.