Aca les dejo las especificaciones... la historia y etc si le toca a Rodri...
Engine and Transmission
Motor Type four-stroke, 2-cylinder, horizontally-opposed "Boxer" engine, air-cooled
Bore x Stroke 90 x 70.6 mm
Cubic Capacity 898 ccm (54.8 cubic inches)
Max Power 67 hp at 7000 rpm
Max Torque 76 Nm at 5500 rpm
Compression Ratio 9.5 : 1
Valves per Cylinder 2
Valve Control ohv, using push rod and rocker arm
Carburation System 2 slide carburetors, Dellorto PHM 38 AS-AD or 38 BS-BD
Engine Lubrication wet sump
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 : 3.00 or 1 : 2.91
Bevel / Crown wheel 11 / 33 teeth or 11 / 32 teeth
Ignition Bosch 12 Volts / 280 Watts
Battery 12 Volts, 25 AH
Alternator Bosch 0.5 hp
Starter battery ignition
Spark Plugs Bosch W 200 T 30/Beru 200/14/3 A/Champion N 7 Y
Suspension and Dimensions
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 front/rear 8.2" (208 mm) / 4.9" (125 mm)
Rims front 1.85 B 20
Rims rear 2.15 B 19
Tires front 3.25 H 20
Tires rear 4.00 H 19
Brakes front dual-disc brake 260 mm dia
Brakes rear simplex drum brake 200 mm dia
Length x Width x Height 85.8" (2,180 mm) x 29.1" (740 mm) x 47.6" (1,210 mm)
Wheel Base 57.7” (1,465 mm)
Tank Capacity 6.3 gallons (24 liters)
Unladen Weight, full Tank 474 lbs. (215 kg)
Max permissible Weight 877 lbs. (398 kg)
Ground Clearance 165 mm
Fuel Consumption 47 MPG (5.0 l/100 km) (at constant 56 MPH / 90 kph)
Standing start ¼ - mile 13.07 seconds 102 mph (Cycle, January 1976)
Top Speed 124 MPH (200 kph)
lo saque de esta pag.. tiene una foto en donde se ve muy bonita la motico.
http://bmwmotorcycle.home.att.net/r90s.html