Date 1976 - 1984 Engine Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled Bore/stroke 94 x 70,6 mm Cubic capacity 980 cm3 Max power 70 PS (51 kW) at 7250 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 constant depression carburettors 76 Nm at 5500 rpm 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 (optional sport version 3,38/2,43/1,93 /1,67/1,50) Rear wheel ratio 1 : 2,91 or 1 : 3,0 Bevel/crown wheel 11 / 32 teeth or 11 / 33 teeth Electrical system Alternator Bosch 12 V / 240 W Ignition battery ignition, from 1980: contact-free electronic ignition (Bosch) Starter Bosch 0,6 PS (from 1978: 0,7 kW) Spark plugs Bosch W 225 T 30 / Beru 230/14/3 A / Champion N 6 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 200 / 125 mm Rims front 1,85 B x 19 Rims rear 2,15 B x 18 Tyres front 3,25 H 19 Tyres rear 4,00 H 18 Brakes front single disc brake O 260 mm Brakes rear Simplex drum brake O 200 mm 1978: Einscheiben O 260 mm Dimensions and weights Length x width x height 2130 x 746 x 1300 mm (from 1978: length 2210 mm) Wheel base 1465 mm Ground clearance 165 mm Tank capacity 24 l Unladen weight, full tank 230 kg Max permissible weight 398 kg Fuel consumption 5,75 l / 100 km (at constant 90 km/h) Acceleration 0 - 100 km/h 4,6 s Top speed 200 km/h	Date 1986 - 1992 Engine Type four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled Bore/stroke 94 x 70,6 mm Cubic capacity 980 cm3 Max power 60 PS (44 kW) at 6500 rpm Max torque 74 Nm at 3500 rpm Compression ratio 8,45 : 1 Valves per cylinder 2 Valve control ohv, using push rod and rocker arm Carburation system 2 constant depression carburettors Bing V 64/32/363 - 64/32/364 Engine lubrication wet sump Power transmission Clutch single discs, dry mit ・ersetzter Tellerfeder 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 : 3,0 Bevel/crown wheel 11 / 33 teeth Electrical system Alternator Bosch 280 W Ignition Kontaktlose elektronische Ignition (Bosch) Starter Bosch 0,7 kW Spark plugs Bosch W 7 DC / Beru 14 - 7 DU / Champion N 9 YC Suspension Type of frame double-loop tubular frame with bolt-on rear section Front suspension telescopic fork with hydraulic shock absorber Rear suspension BMW Monolever - swinging arm Spring travel 175 / 121 mm Rims front MTH 2,50 x 18 E Rims rear MTH 2,50 x 18 E Tyres front 90/90 18 51 H Tyres rear 120/90 18 65 H Brakes front single disc brake O 285 mm Brakes rear Simplex drum brake O 200 mm Dimensions and weights Length x width x height 2175 x 800 x 1380 mm Wheel base 1447 mm Ground clearance 140 mm Tank capacity 22 l Unladen weight, full tank 229 kg Max permissible weight 440 kg Fuel consumption 4,3 l / 100 km (at constant 90 km/h) Acceleration 0 - 100 km/h 5,0 s Top speed 185 km/h