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Identification    
 Letter designation    B3
 Color     
 Frame #    
 Engine #    
     
Dimensions    

 Overall length

   2,220 mm

 Overall width

   830 mm

 Overall height

   1,180 mm
 Wheelbase    1,505 mm
 Road clearance    155 mm
 Dry weight    241 kg
 Fuel tank capacity    13.6 l
     
Performance     
 Climbing ability    
 Braking distance    11.5 m from 50 kph
 Minimum turning radius    2.4 m
     
Engine     
 Type    4 stroke, DOHC, 4 cylinder, air cooled 
 Bore and stroke    70.0 mm x 66.0 mm
 Displacement    1,015 cc
 Compression ratio    8.7
 Maximum horsepower    86 hp @ 8,000 rpm
 Maximum torque    8.5 kg-m @ 6,500 rpm
 Valve timing    

 Inlet

 

Open

Closed

Duration 

 30° BTDC 

 70° ABDC

 280°

 Exhaust

 

Open

Closed

Duration 

 70° BBDC 

 30° ATDC

 280°

 Carburetors    (4) Mikuni VM26SS
 Lubrication system    Wet sump
 Engine oil Type   SAE 10W40, 10W50, 20W40, 20W50
  Capacity  3.7 l
 Starting system    Electric starter and kick
 Ignition system    Battery and coil (transistorized)
 Cylinder numbering method    Left to right, 1-2-3-4
 Firing order    1-2-4-3
 Ignition timing    From 10° BTDC @ 1,000 rpm to 40° BTDC @ 2,350 rpm
 Spark plugs    NGK B8ES, ND W24ES-U
     
Transmission     
 Type    5 speed, constant mesh, return shift
 Clutch    Multi-disc, wet
 Gear ratio 1st   3.17
  2nd  2.19
  3rd  1.67
  4th   1.38
  5th   1.22
  6th   -
 Primary reduction ratio    1.73
 Final reduction ratio    2.20
 Overall drive ratio    4.64 
   
Electrical equipment     
 Alternator    Kokusan AR3703
 Regulator/rectifier    Kokusan RS2127
 Ignition coils    Toyodenso ZC001-14, ZC001-23
 Battery    Yuasa YB14L-A2 (12V 14AH)
 Starter motor    Mitsuba SM-226-K
 Headlight Type   Sealed
  Bulb   12V 60/50W
 Tail/brake light    12V 8/27W
 City light  

 -

 Turn signal lights    12V 23W
 Meter lights    12V 3.4w
 Indicator lights    12v 3.4w
 Horn    12V 2.5A
     
Frame     
 Type    Tubular, double cradle
 Steering angle    41° to either side
 Castor    64°
 Trail    90 mm
 Tire size Front   ML90 - 19
  Rear   MT90 - 16
 Suspension Front   Telescopic fork
  Rear   Swing arm
 Suspension stroke Front   
  Rear   
 Front fork oil Type   
  Capacity   
  Oil level   
     
Brakes     
 Type Front   Dual disc
  Rear   Single disc
 Effective disc diameter Front   
  Rear   
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The Super Four

Short clip from the Z1 movie with Micky Hesse. In September 1972, the Z1 was introduced to the U.S. public, and sales started in November of that year.

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