BMW R 45

BMW R 45 Date 1978 - 1985

Number sold 28.158

Price 5.880,- DM

Engine

Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled
Bore/stroke 70 x 61,5 mm
Cubic capacity 473,4 cm3
Max power 35 PS (26kW) at 7250 rpm [27 PS (20kW) at 6500 rpm]
Max torque 37,5 Nm at 5500 rpm [31,3 Nm at 5000 rpm]
Compression ratio 9,2 : 1 [ 8,2 : 1]
Valves per cylinder 2
Valve control ohv, using push rod and rocker arm
Carburation system 2 constant depression carburettors Bing 64/28/303-304 [Bing 64/26/303-304]
Engine lubrication wet sump

Power transmission

Clutch dry single plate, with diaphragm spring
Number of gears 5
Gear selection dog-type gearbox (ratchet foot lever)
Gear ratios 4,4 / 2,86 / 2,07 / 1,67 / 1,50 :1
Rear wheel ratio 1 : 3,89 [1 : 4,25]
Bevel/crown wheel 9 / 35 teeth [8 / 34 teeth]

Electrical system

Alternator Bosch 280 W
Ignition battery ignition
Starter Bosch 0,7 kW
Spark plugs Bosch W 5 D / Beru 14-5D / Champion N 6 Y [Bosch W 7 D / Beru 14 - 7 D / Champion N 10 Y]

Suspension

Type of frame double-loop tubular frame with bolt-on rear section
Front suspension telescopic fork with hydraulic shock absorber
Rear suspension long swinging arm with adjustable strut
Spring travel 175 / 110 mm
Rims front 1,85 B 18
Rims rear 2,50 B 18
Tyres front 3,25 S 18
Tyres rear 4,00 -S 18
Brakes front single disc brake 260 mm
Brakes rear Simplex drum brake 200 mm

Dimensions and weights

Length x width x height 2210 x 688 x 1080 mm
Wheel base 1400 mm
Ground clearance 130 mm
Tank capacity 22 l
Unladen weight, full tank 205 kg
Max permissible weight 398 kg
Fuel consumption 5,5 l / 100 km [5,0 l / 100 km] ( at konstant 90 km/h)
Acceleration 0 - 100 km/h 7,4 s [8,5 s]
Top speed 160 km/h [145 km/h]

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