KZ650 Technical Specifications

Engine

Engine:           DOHC, Inline 4, Air Cooled

Displacement:            652 CC

Valves:            8 Valve (4 Intake / 4 Exhaust) Shim Under-Bucket

Valve Clearance, Cold:          0.08 - 0.18mm (0.003 - 0.007in)

Valve Timing: Inlet:

Open: 22° BTDC

Closed: 52° ABDC

Duration: 250$deg;

Outlet:

Open: 60° BBCD

Closed: 20° ATDC

Duration: 260°

Bore and Stroke:       62 X 54mm (2.44 X 2.13in)

Compression Ratio:   9.5:1

Compression Pressure:        10-14 kg/cm² (155-185 PSI)

Max Horsepower:      64 @ 8,500 RPM

Max Torque:  5.8kg (41.9 ft-lbs) @ 7,000 RPM

Cam Chain Type:       Single Roller or Hy/Vo depending on Model

Lubrication:   Forced, Twin Rotor Oil Pump

Oil Type:         SAE 10W40 (Recommended)

Oil Capacity:   Approx. 3.8L

Cylinder Numbering:            Left to Right 1-2-3-4

Firing Order:  1-2-4-3

Idle Speed:     900 - 1,050 RPM

Fuel System

Carburetors:  4 x Mikuni VM24SS

Float Level in Bowl:   29-31mm

Main Jet Size: 102.5

Pilot Jet Size:  15

Fuel Capacity:            16.8L (4.4 US Gallons)

Fuel:    Non-leaded Gasoline

Fuel Consumption:    Approx. 45 MPG Average

Throttle Cable Play:  2-3mm

Drive Train / Transmission

Clutch Type:  Wet, Multi-plate

Recommended Clutch Plate Thickness:      3.7 - 3.9mm

Clutch Cable Play:     2-3mm

Gear Box:        5 Speed Constant Mesh (Manual), Return Shift

Gear Ratios:    1st - 2.33

2nd - 1.63

3rd - 1.27

4th - 1.04

5th - 0.89

Primary Reduction Ratio:     2.55

Final Reduction Ratio:           2.56

Overall Drive Ratio:   5.81 @ Top Gear

Primary and Final Drive Type:        Chain / Chain

Drive Chain Length:  102 Links

Recommended Chain Tension:        20-30mm

Shift Pattern: 1-N-2-3-4-5

Ignition System

Starter Type: Electric, Kick (Kick was eliminated on later models)

Ignition Type:            Battery, Coil

Pickup Type:  Points, Electronic (Points were changed in favor of Electronic on later models)

Spark Plugs:   4 x NGK B7ES, ND W22ES-U or Champion N4

Spark Plug Gap:         0.7 - 0.8mm (0.028 - 0-031in)

Ignition Timing:         10° BTDC @ 1,500 RPM

35° BTDC @ 3,200 RPM

Breaker Point Gap:    0.3 - 0.4mm (0.012 - 0.016in) on models so equipped

Electrics

Battery:          Yusa YB10L (12V 10AH)

Continuous Charge Rate:     1.0A

Headlight:      12V 50/35W

Tail / Brake Light:     12V 8/27W

Turn Signal Lights:    12V 23W

Meter Lights: 12V 3.4W

Neutral Indicator Light:        12V 3.4W

Turn Signal Indicator Lights:           12V 3.4W

High Beam Indicator Light:  12V 3.4W

Oil Pressure Warning Light:            12V 3.4W

Brake Light Failure Indicator Light:            12V 3.4W

Horn:  12V 2.5A

Fuses: 20A (Main)

10A (Head)

10A (Tail)

Alternator:     Nippon Denso 0037000-1340

Regulator / Rectifier:            Shindengen SH221-12

Ignition Coils: Toyo Denso IGC088K-0000 / IGC089K-0000

Starter Motor:            Mitsuba SM224-D

Frame & Suspension

Frame:            Tubular Steel, Double Cradle

Front Suspension:     Telescopic Forks

Fork Oil Type:            10W40 or 15W Fork Oil

Fork Oil Capacity:      165cc Each Leg (5.6 oz)

Rear Suspension:      Swing Arm, Adjustable Twin Shock

Steering Geometry:   63° Rake / 4.25 in trail

Steering Head Angle:            39.5°

Minimum Turning Radius:   2.4m (94.5 in)

Brake Fluid Type:      DOT3, DOT4, DOT5

Front Brake Type:     245mm Disc

Minimum Brake Disc Thickness:     6mm

Rear Brake Type:      180 x 40mm Drum (Dual Shoe), 245mm Disc (Discs were used on some later models)

Braking Distance:      12m from 50 kph (29.4 ft @ 31 mph)

Wheels:          14 Spoke Alloy

Tire Size:        Front: 3.25H-19 4PR

Rear: 4.00H-18 4PR

Road Clearance:        145mm (5.7 in)

Saddle Height:           31.9 inches

Wheel Base:   1,420mm (55.9 in)

Overall Length:          US: 2,170mm (85.4 in) Europe: 2,220mm

Overall Width:           850mm (33.5 in)

Dry Weight:   211kg (465 lbs)

Climbing Angle:         30°