Identification    
 Letter designation    B4
 Color     
 Frame #    
 Engine #    
     
Dimensions    

 Overall length

   2,150 mm

 Overall width

   855 mm

 Overall height

   1,195 mm
 Wheelbase    1,450 mm
 Road clearance    145 mm
 Dry weight    218 kg
 Fuel tank capacity    14.5 l
     
Performance     
 Climbing ability    
 Braking distance    
 Minimum turning radius    
     
Engine     
 Type    4 stroke, DOHC, 2 cylinder, air cooled 
 Bore and stroke    78.0 mm x 78.0 mm
 Displacement    745 cc
 Compression ratio    8.5
 Maximum horsepower    55 hp
 Maximum torque    6.0 kg-m @ 3,000 rpm
 Valve timing    

 Inlet

 

Open

Closed

Duration 

 

 Exhaust

 

Open

Closed

Duration 

 

 Carburetors    (2) Mikuni BS38
 Lubrication system    Wet sump
 Engine oil Type   SAE 10W40, 10W50, 20W40, 20W50
  Capacity  4.0 l
 Starting system  
 Ignition system    Battery and coil (transistorized)
 Cylinder numbering method    
 Firing order    
 Ignition timing    From 5° BTDC @ 1,000 rpm to 30° BTDC @ 3,750 rpm
 Spark plugs    NGK B6ES or ND W20ES-U
     
Transmission     
 Type    5 speed, constant mesh, return shift
 Clutch    Multi-disc, wet
 Gear ratio 1st   2.33
  2nd  1.63
  3rd  1.27
  4th   1.04
  5th   0.89
  6th   -
 Primary reduction ratio    2.48
 Final reduction ratio    2.38
 Overall drive ratio    5.23 @ top gear
   
Electrical equipment     
 Alternator    
 Regulator/rectifier    
 Ignition coils    
 Battery    
 Starter motor    
 Headlight Type   
  Bulb   12V 50/35W
 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    
 Steering angle    
 Castor    63.5°
 Trail    105 mm
 Tire size Front   3.25 - 19
  Rear   4.00 - 18
 Suspension Front   
  Rear 
 Suspension stroke Front 
  Rear 
 Front fork oil Type 
  Capacity 
  Oil level   
     
Brakes     
 Type Front 
  Rear 
 Effective disc diameter Front 
  Rear