1978 KZ 650  
Identification    
 Letter designation    B2
 Color     Luminous dark blue, Luminous burnt red
 Frame #    KZ650B-046873 - KZ650B-508016
 Engine #    KZ650BE0460001 - KZ650BE027501
     
Dimensions    

 Overall length

   2,170 mm, EU: 2,220 mm

 Overall width

   850 mm

 Overall height

   1,145 mm
 Wheelbase    1,420 mm
 Road clearance    145 mm
 Dry weight    211 kg
 Fuel tank capacity    16.8 l
     
Performance     
 Climbing ability    30°
 Braking distance    12 m from 50 kph
 Minimum turning radius    2.4 m
     
Engine     
 Type    4 stroke, DOHC, 4 cylinder, air cooled 
 Bore and stroke    62.0 x 54.0 mm
 Displacement    652 cc
 Compression ratio    9.5
 Maximum horsepower    62 hp @ 8,000 rpm
 Maximum torque    5.8 kg-m @ 7,000 rpm
 Valve timing    

 Inlet


Open

Closed

Duration 

 22° BTDC 

 52° ABDC

 254°

 Exhaust


Open

Closed

Duration 

 60° BBDC 

 20° ATDC

 260°

 Carburetors    (4) Mikuni VM24 SS
 Lubrication system    Wet sump
 Engine oil Type   SAE 10W40, 10W50, 20W40, 20W50
  Capacity  3.5 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 35° BTDC @ 3,200 rpm
 Spark plugs    NGK B7ES, ND W22ES-U, or CHAMPION N-4
     
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    2.55
 Final reduction ratio    2.63
 Overall drive ratio    5.95 @ top gear
   
Electrical equipment     
 Alternator    Nippon Denso 037000-1340
 Regulator/rectifier    Shindengen SH221-12
 Ignition coils    Toyo Denso IGC088K-0000, IGC089K-0000
 Battery    Yuasa YB10L, 12V 10AH
 Starter motor    Mitsuba SM-224D
 Headlight Type   Sealed
  Bulb   12V 50/35W
 Tail/brake light    12V 8/27W
 City light  

 12V 8/23W

 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    39.5° to either side
 Castor    63°
 Trail    108 mm
 Tire size Front   3.25 - 19
  Rear   4.00 - 18
 Suspension Front   Telescopic fork
  Rear   Swing arm
 Suspension stroke Front   140 mm
  Rear   80 mm
 Front fork oil Type   SAE 15W
  Capacity   183 ~ 191 cc (dry, each fork), ~ 165 cc When changing oil
  Oil level   393 mm (from top of inner (upper) tube, spring in place)
     
Brakes     
 Type Front   Single disc
  Rear   Internal expansion, leading-trailing
 Effective disc diameter Front   250 mm
 Brake drum inside diameter Rear   180 x 40 mm