Honda CT90

The CT90 1966 – 1979

Parts are still Available to Order:

Front Forks changed in 1969.

Plastics changed in 1969.


Honda CT90 Specifications

General Information

Model: CT90

Engine and transmission

Displacement:   89.6 cc

Engine type:       Single cylinder, four-stroke

Power: 7.0 HP @ 8500 RPM

Compression:    8.2:1

Bore x stroke:    50.0 x 45.6 mm

Ignition:  Points

Points Gap:     0.3-0.4 mm (0.012-0.016 in)

Valve clearance:        0.05 (0.002in) both

Idle Speed:     1,400 ± 100 rpm

Engine Oil:      0.9 L

Spark Plug:     D8HA (NGK)

Spark Plug Gap:  0.024-0.028 (0.6-0.7in)

Fuel control:       Overhead Cams (OHC)

Fuel system:      Carburettor

Cooling system:                Air

Gearbox:             4-speed Dual Range Sub Transmission

Fuel Reserve:             1890ml


Transmission type

Final Drive:          Open Chain


Chassis, suspension, brakes and wheels

Front suspension:            Leading Link (1966 – 1969) & Telescopic fork (1969 – 1979)

Rear suspension:             Swing Arm

Front tyre:          275/300-17

Rear tyre:            275/300-17

Front brakes:     Expanding brake (drum brake)

Rear brakes:       Expanding brake (drum brake)

Seat:      One person seat


Physical measures and capacities

Dry weight:         81.9 kg

Overall height:  990 mm

Overall length:  1,803 mm

Overall width:    660 mm

Wheelbase:        1,193 mm

Fuel capacity:     6.05 litres


Other specifications

Starter: Kick

Carrying capacity:  Rear cargo rack & Front Carry Rack

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