S90

Specifications
Engine
Cooling and type Air-cooled, 4-cycle
Cylinder and  Lay-out Single cylinder,  inclined  forward  75°.    .
Valves Overhead valves
Displacement 89.6 cc
Bore and Stroke 50X45 mm (1.97 X 1.77 in.)
Compression Ratio 8.2 :  1
Maximum Output 8.0 PS/9,500 r.p.m.
Maximum Torque 0.65 m-kg/8,000 r.p.m.
  (4.70 ft-lb/8,000  r.p.m.)
Ignition  System Battery
Ignition Timing   before top dead center
  (full  advance 40°)
Spark Plug D-6HW and  D-9H  for high speed and severe  use
Battery 6V, 6AH
Carburetor Piston valve type
Lubrication Wet sump with  pump
Oil  Pump Gear-type
Clutch Wet multi-plate type
Transmission 4  speeds forward,  constant  mesh  type
Gear Shift Left foot type  return  system
     
Gear Ratios First 2.54 (30.36)
  Second 1.53 (18.25)
  Third 1.09  (13.05)
  Fourth 0.88  110.52)
     
Reduction Ratios Primary Gear 3.72
  Secondary Chain 3.21
     
Frame
Type "Backbone"  type  enclosed  "T"  shape
     
Suspension Front                  Telescopic  fork
  Rear Swinging arm
Brakes,  Front and  Rear Internal  expansion  type
Steering Angle 43°  right and  left
Caster 65°
Trail 75 mm  (2.95 in.)
Tire Size,  Front and  Rear 2.50-18,4Ply
Fuel  Tank Capacity 7.5 liters  11.6  Imp.  gal,  2.0  US  gal)
     
Dimensions
Overall  Length 1.890 m (74.4 in.)
Overall  Width 0.650 m (25.6 in.)
Overall   Height 0.980 m 138.6 in.)
Wheelbase 1.195 m (47.0 in.)
Ground  Clearance 0.145 m (  5.7 in.)
Min.  Turning  Radius 1.950 m (76.8 in.)
Weight 80 kg (176 1b)
Maximum  Speed 100 kph (62 mph,  approx.)
Fuel  Consumption 75 km/l (at 40 kph)
  (210 miles/Imp  gal,   176 miles/US  gal  at 25 mph)
Climbing  Ability 18°
Braking  Distance 7.0 meters  (at  35 kph)
  (123 ft at 22  mph)