The BMW R4 Series 3 motorcycle specifications include a 398 cc (24.29 cu in) engine, power of 14 hp (10.2 kW) @ 4,000 rpm, and a listed weight of 137 kg (302 lb).
Key specifications
How the BMW R4 Series 3 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 83% lower than the BMW database average. Around the 4th percentile across BMW models.
About 56% lower than the BMW database average. Around the 7th percentile across BMW models.
About 40% lighter than the BMW database average. Around the 4th percentile across BMW models.
About 38% smaller than the BMW database average. Around the 6th 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.
14 hp — more powerful than about 4% of BMW models with power data.
398 cc — larger displacement than about 7% of BMW models.
137 kg — heavier than about 4% of BMW models, or lighter than about 96%.
12 L — larger than about 6% of BMW fuel tanks in this database.
Dimensions compared with BMW average
Each measurement is compared with the average value across BMW models where that dimension is available.
1,980
2,193
10% below average.
850
877
3% below average.
950
1,199
21% below average.
1,300
1,497
13% below average.
Mechanical overview
Additional useful specifications
| Front tire size | 3.50-26.00 |
|---|---|
| Rear tire size | 3.50-26.00 |
| Estimated theoretical fuel range | 343 km |
| Power-to-weight ratio | 0.102 hp/kg |
| Power-to-weight | 102.2 hp/tonne |
| Specific power | 35.2 hp/L |
| Bore/stroke ratio | 1.08:1 (Oversquare) |
Model information
| Year released | 1934 |
|---|---|
| Category | Allround |
Engine specifications
| Engine type | Single cylinder, four-stroke |
|---|---|
| Displacement | 398 cc (24.29 cu in) |
| Power | 14 hp (10.2 kW) @ 4,000 rpm |
| Bore × stroke | 84.0 x 78 mm (3.3 x 3.1 inches) |
| Compression ratio | 5.7:1 |
| Cooling system | Air |
| Fuel system | Carburettor |
| Fuel control | Overhead Valves (OHV) |
| Starter | Kick |
| Lubrication | Wet sump |
Transmission and drivetrain
| Final drive | Shaft drive (cardan) (final drive) |
|---|---|
| Clutch | Dry-single plate-cable operated |
Chassis and suspension
| Frame | Pressed steel duplex |
|---|---|
| Front suspension | Cartridge |
| Rear suspension | Rigid |
Brakes, wheels and tires
| Front brakes | Expanding brake (drum brake) |
|---|---|
| Rear brakes | Expanding brake (drum brake) |
| Front tire | 3.50-26.00 |
| Rear tire | 3.50-26.00 |
Dimensions and weight
| Wet weight | 137 kg (302 lb) |
|---|---|
| Overall length | 1,980 mm (78.0 inches) |
| Overall width | 850 mm (33.5 inches) |
| Overall height | 950 mm (37.4 inches) |
| Wheelbase | 1,300 mm (51.2 inches) |
| Carrying capacity | 200kg |
Fuel and emissions
| Fuel capacity | 12.00 L (3.17 US gal) |
|---|---|
| Fuel consumption | 3.50 L/100 km (28.6 km/l or 67.21 mpg) |
| Greenhouse gases | 81.2 CO 2 g/km. (CO2 – Carbon dioxide emission) |
Performance
| Top speed | 100.0 km/h (62.1 mph) |
|---|
Other specifications
| Seat | Solo seat with springs |
|---|
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.