Technical Data

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Engine Engine model Four cycle opposed-twin with hemispherical combustion
chambers
_____________________ ____________________________ ____________ __ ________________________________________________
Greatest actual output HP at RPM
HP at RPM 36 / 6600 46 / 6600 57 / 6400
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Output per 1000 cc HP / liter 72 76 76
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Maximum torque lb/ft at RPM 29 / 5000 36 / 5000 43 / 5000
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Maximum permissible speed RPM 7000 7000 7000
Permissible Cruising speed RPM 6500 6500 6300
Idling speed RPM 600 - 800 600 - 800 600 - 800
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Max. permissible speed during
break-in period
up to 600 miles RPM 4000
up to 1200 miles RPM 5000
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Average piston speed ft/sec at RPM 50.6 / 6400 50.6 / 6400 47.9 / 6200
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Number of cylinders 2 2 2
Cylinder arrangement opposed
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Cylinder bore mm 67 73.5 82
Piston stroke mm 70.6 70.6 70.6
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Effective stroke volume c.c 498 599 745
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Compression ratio 8.6:1 9.2:1 9.0:1
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Dwell angle adjustment at .08" valve
clearance (tolerance + 2.5o)
Intake opens ATDC ATDC 10o BTDC
Intake closes 40o ABDC 40o ABDC 50o ABDC
Exhaust opens 40o BBDC 40o BBDC 50o BBDC
Exhaust closes BTDC BTDC 10o BTDC
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Breaker dwell angle 110o + 1o
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Operating valve clearance
measured when engine is cold Intake .006"
Exhaust .008"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Rotation Right hand clockwise when viewed toward alternator
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Lubricating system high pressure wet sump
Oil pump Eeaton system (hypo-trochoid teeth)
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Fuel consumption in mpg US according to 47 44,3 52,3
DIN 70 030 (at 67 mph) (at 68 mph) (at 68 mph)
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Carburetor Design Two Bing carburetors inclined with Two inclined Bing
needle valve, throttle slide and Con- Butterfly valve, con-
centric lever float. stant velocity carbu-
retors with needle
valve, vacuum slide
& Concentric lever
float.
_____________________ ____________________________ ____________ __ ________________ ________________ __________________
Carburetor type left 1 / 26 / 113 1 / 26 / 111 64 / 32 / 4
right 1 / 26 / 114 1 / 26 / 112 64 / 32 / 3
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Carburetor I. D. mm 26 26 32
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Main jet 135 140 140
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Needle jet 2.68 2.68 2,73
with acc. pump
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Jet Needle No. 4 4 46-241
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Needle position 3 2 3
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Idling jet 35 40 45
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Idling air jet -- -- dia 1
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Idling air screw / Idling Mixture regulating 0,5 - 1,5 1/4 - 11/4 1
screw opened turns
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
By-pass bore mm dia 0.8 0.8 0.7
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Float valve mm dia 2.2 2.2 2.5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Float weight g 10 10 10
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Intake air filter One common "micro-star" dry air filter for both carburetors
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 75/5
Starting (choke) jet 0.6
Starting air jet 2.0
Mixture hole in rotary valve 2.0
Rotary valve diaphragm 65 - 810
Distributing slide valve g 102

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Power Transmission Clutch Single plate dry clutch with diaphragm spring
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Transmission 4-speed, claw - type transmission mounted to the engine.
Shock absorption of the drive in all speeds. Ratchet type
foot shifting.
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Transmission Ratios: 1. Gear 3.896:1
2. Gear 2.578:1
3. Gear 1.875:1
4. Gear 1.50 :1
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Power transmission from the transmission Enclosed drive shaft in the right swing arm tube with uni-
to the rear wheel versal joint, equipped on the side of the rear drive with
Hypoid Gear coupling.
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Rear wheel drive Palloid Spiral Bevel Gears
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Rear drive ratio 1 : 3.56 1 : 3.36 1 : 3,2 (until chassis No. )
Number of teeth 9 / 32 11 / 37 10 / 32 (2,91 e.g. 11 / 32)
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Chassis Frame Tubular steel cradle frame made of oval tubes with bolted-
on frame rear section, not admitted for side-car
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Suspension front wheel Telescopic fork with large volume, double acting, hydraulic
shock absorbers, front fork travel 8.43"
rear wheel Swing arm with 3-position-spring-legs and double acting,
hydraulic shock absorbers rear swing arm travel 4.92"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Lock angle of front fork 46o
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Front wheel caster 3.35" approximately
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Brakes Aluminium alloy, full hub brakes with cast-in perlite rings
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Front wheel Duplex brake (two leading brake shoes)
rear wheel Simplex brake
Brake drum 7.9" diameter, lining width 1.2"
Effektive brake lining
Area per brake in sq. in. 17 approximately
____________________________ _____________________ ____________ __ ________________ ________________ ________________
Rims Front 1.85 B x 19
Rear 1.85 B x 18
_____________________ _______ _____________________ ____________ __ ________________ ________________ ________________
Tires Front 3.25 S 19
Rear 4.00 S 18
_____________________ _______ _____________________ ____________ __ ________________ ________________ ________________
Maximum tire imbalance, measured in cmp
at the inside diameter of the rim 170
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Corresponds to oz. .28 - .32
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Tire inflation in psi
Cold Front Wheel 27 27 27
with passenger 30 30 30
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Rear Wheel 30 30 30
with passenger 35 35 35
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
When tires are hot, increase by 4 psi
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
When driving at maximum speed for longer
periods, increase the tire inflation by 3 psi
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

Exhaust system Sylencer dia mm 100
Exhaust tube dia mm 38 x 1,5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

Fuels and Lubricants Fuel Regular Hi Test Hi Test
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Tank capacity gallons 6.3
reserve gallons .5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Lubricating Oil Engine Name-brand HD oil for gasoline engines
Below 50oF outside temp. SAE 20, SAE 10W30, SAE 10W50
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
From 32-86oF outside temp. SAE 30, SAE 20W40, SAE 20W50
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Over 86oF outside temp. and for sustained SAE 40
high speed driving
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Capacity
without filter change pints 4.2
with filter change pints 4.75
________________________ _________________________ ____________ __ ________________ ________________ ________________
Transmission Name-brand hypoid gear oil SAE 90
Capacity pints 1.7
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Drive shaft housing Name-brand hypoid gear oil SAE 90
Capacity pints 0.2
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Rear wheel drive Name-brand hypoid gear oil SAE 90
Capacity pints 0.5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Telescopic fork Shock Absorber oil
Shell 4001
BP Olex HL 2463 Aero-Hydraulic
Shell aerofluid 4
Castrol BMW shock absorber oil
Capacity per fork leg ccm 280
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Breaker lubricating felt and centrifugal Bosch grease Ft 1 v 4
timing advance
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Guide shaft (for advance unit) Bosch grease Ft 1 v 22 or Ft 1 v 26
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Wheel bearings & other greasing points Name-brand multi-purpose grease with 180oC dripping
point
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Corrosion inlubiting oil Engine corrosion inhibiting oil SAE 20
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Upperlube conservative Upperlube conservative for four-cycle engines
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Acid-free grease Corrosion prevention grease
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Protective oil Finish preservative
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Dimensions Overall width (engine) 29.1" 29.1" 29.1"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Overall height without mirror 40.7" 40.7" 40.7"
(motorcycle without load)
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Saddle height without load 33.5" 33.5" 33.5"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Overall length 82.7" 82.7" 82.7"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Wheelbase 54.5" 54.5" 54.5"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Ground clearance under load of a rider
weighing 165 lbs. 6.5" 6.5" 6.5"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Weights Curb weight, including lubricants but less
fuel and tools (lbs.) 412 423 423
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Curb weight, including lubricants, fuel and
tools (lbs.) 452 463 463
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Permissible total weight
= curb weight + persons and baggage
(lbs.) 881 881 881
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Permissible wheel load Solo front at 27 psi
tire pressure (lbs.) 353
Rear, at 28 psi tire pressure (lbs.) 539
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Permissible wheel load with passenger
front at 28 psi tire pressure (lbs.) 391
rear at 32 psi tire pressure (lbs.) 606
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Maximum number of persons
including rider 2 persons
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Performance The actually achieved maximum speed of a broken-in motorcycle depends to a large extent on the air
resistance offered by the rider due to his size, posture and clothing, and upon road and weather con-
ditions.
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Speed
mph approximately 98 104 110
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Acceleration from zero to
30 mph in s 2.9 2.6 2.2
40 mph in s 4.8 4.0 3.0
50 mph in s 6.8 5.4 4.7
60 mph in s 9.6 7.7 6.1
70 mph in s 12.5 10.2 8.4
80 mph in s 17.5 13.6 10.7
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Standing 1/4 mile per hour 17.2 15.8 14.6
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Standing kilometer in s 32.3 30.4 28.2
Average speed in mph achieved thereby 68.3 73.3 79.5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Speedometer gear ratio (km) .811 .766 .655
(miles) 1.297 1.226 1.0625
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

R 50/5 R 60/5 R 75/5
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Electrical System
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Battery Varta, 12 V 15 Ah
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Starter Bosch DF 12 V .5 HP
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Relay for repeat start prevention Stribel SR 9570
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Three-phase alternator Bosch G 1 14 V 13 A 19
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Three-phase alternator drive Direct from crankshaft
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Diode board Bosch type 0 197 002 001
RS 20/1 A 1 A
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Voltage Regulator Bosch AD 1/ 14 V
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Condenser 0.2 uF - 25%
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Ignition coils, two Bosch E 6 V
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Ignition breaker Automatic centrifugal
Advance on the camshaft
advance
start at rpm 800
end at rpm 2500
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Breaker contact gap 0.014" to 0.016"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Ignition Timing 9o before TDC
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Automatic timing advance 25o +/- 2o 30' CS
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Spark plugs Bosch W 230 T 30 (R 50/5, R 60/5)
Bosch W 200 T 30 (R 75/5)
Beru 230/14/3 A (R 50/5, R 60/5)
Beru 200/14/3 A (R 75/5)
Champion N 7 Y (R 50/5, R 60/5, R 75/5)
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Electrode gap .027"
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Head light Bosch type 0 303 550 002
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Turn signal flasher Hella 91 M 2 E 2 x 21 W-12 V
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Head light high and low beam Double filament bulb
45/40 W
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Parking light 12 V / 4 W
_____________________ ____________________________ ____________ __ ________________ ________________ ________________
Indicator lights
high beam, blue 12 V / 2 W
oil pressure, orange 12 V / 2 W
neutral, green 12 V / 2 W
charging control, red 12 V / 4 W
turn signals, front and rear two each, amber 12 V / 21 W
tail light and license plate light, double filament 12 V / 5 W
stop light, bulb 12 V / 21 W
___ __________________ ____________________________ ____________ __ ________________ ________________ ________________
Horn Bosch type 0 320 123 013
12 V 400 HZ or Hella type B
31-12VOH3
_____________________ ____________________________ ____________ __ ________________ ________________ ________________

Wiring diagram

  1. Turn signal switch
  2. Head light
    1. Turn signal flasher
    2. Head light high beam
    3. Head light low beam
    4. Parking light
    5. Cable connector
    6. Ignition and light switch
    7. High beam indicator light (blue)
    8. Instrument illumination
    1. Oil pressure indicator light (orange)
    2. Neutral indicator light (green)
    3. Battery charging indicator light (red)
  3. Dimmer switch
  4. Turn signal, front, right
  5. Hand brake stop light switch
  6. Turn signal, front, left
  7. Ground connection on frame for ignition coils
  8. Relay for repeat start prevention
  9. Horn
  10. Contact breaker
  11. Ignition coils
  12. Condenser
  13. Neutral indicator light switch
  14. Oil pressure indicator light switch
  15. Foot brake stop light switch
  16. Diode plate
  17. Spark plugs with caps
  18. Three-phase alternator
  19. Plug connection in wiring harness
  20. Turn signal, rear, right
  21. Tail light
    1. Rear light and license plate illumination
    2. Stop light
  22. Turn signal, rear left
  23. Voltage regulator
  24. Battery
  25. Ground connection on transmission cover
  26. Starter motor

Wiring color coding
BL = blue
BR = brown
GE = amber
GR = grey
GN = green
RT = red
SW = black
WS = white

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