BMW R45 (reduced effect)back 1981 forward

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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: 55.1 inch
Ground clearance: 5.12 inch
Seat height: 31.9 inch
Weight
Curb weight: 451.9 lbs
Chassis and suspension
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
Other
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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