Mbike - Catalogue. Community. Map.
Catalogue. Community. Map.
BMW R45 (reduced effect) 1978 
Air cooled, 473cc, Boxer, OHV
| Power: | 27.06 HP (19.9 kW) @ 6500 rpm |
| Torque: | 31.3 Nm (23.09 lb-ft) @ 5000 rpm |
| Final drive: | Shaft |
| Top speed: | 90.1 mph |
| Curb weight: | 451.9 lbs |
| Category: | All-rounder |
| Tags: | Classic bike, Naked |
|
Engine and transmission
|
|
| Engine type: | 2 cylinders, 4-stroke, Boxer |
| Displacement: | 473 cc (28.9 cubic inches) |
| Bore × stroke: | 2.76 inch × 2.42 inch (oversquare - shortstroke) |
| Cooling system: | Air cooled |
| Power: | 27.06 HP (19.9 kW) @ 6500 rpm |
| Torque: | 31.3 Nm (23.09 lb-ft) @ 5000 rpm |
| Throttle: | Cable operated |
| Valves | |
| Valve train: | OHV, variable |
| Valves per cylinder: | 2 |
| Fuel and ignition | |
| Sparks per cylinder: | 1 |
| Fuel supply system: | Carburetor |
| Funnel diameter: | 1.02 inch |
| Compression: | 8.2:1 |
| Engine mounting: | Longitudinal |
| Lubrication system: | Wet sump |
| Gear box: | Manual 5-speed |
| Clutch: | Dry, single plate, cable operated |
| Final drive: | Shaft |
| Spark plug pipe type: | Bosch, W 5 D |
| Starter: | Electric |
|
Dimensions
|
|
| Physical measures | |
| Length: | 83.1 inch |
| Width: | 27.1 inch |
| Height: | 42.5 inch |
| Wheel base: | 54.7 inch |
| Ground clearance: | 5.12 inch |
| Seat height: | 30.3 inch |
| Weight | |
| Curb weight: | 451.9 lbs |
|
Chassis and suspension
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|
| Frame type: | steel, Double cradle frame |
| Front | |
| Suspension: | Cartridge |
| Suspension travel: | 6.89 inch |
| Brake: | Single Disk, Ø10.24 inch |
| Tire: | 3.27 × 18 |
| Rear | |
| Suspension: | twin shock, Swingarm |
| Suspension travel: | 4.33 inch |
| Brake: | Drum, Ø7.87 inch |
| Tire: | 4.02 × 18 |
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Other
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|
| ABS available: | No |
| Power-to-weight ratio: | 0.10 KW/lbs (10.30 lbs/HP) |
| Acceleration (0-60 mph): | 8.5 sec |
| Top speed: | 90.1 mph |
| Fuel capacity: | 5.81 gals |
| Number of riders: | 2 persons |
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