| MODEL | HONDA CT 90 TRAIL 90 1966 - 1979 |
| Year | 1966 - 1979 |
| Engine Type | Four stroke, single cylinder, SOHC, 2 valves |
| Displacement / Capacity | 89.5 cc / 5.4 cu in |
| Bore X Stroke | 50 x 45.6 mm |
| Compression Ratio | 8.5:1 |
| Cooling System | Air cooled |
| Max Power | 5.2 kW / 7 hp @ 8500 rpm |
| Max Torque | 8.2 Nm / 6.1 lb-ft @ 6000 rpm |
| Ignition | Contact breaker |
| Induction | Carburettor |
| Start System | Kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 4 Speed with dual-range sub-transmission (from Aug 1967) |
| Clutch | Wet multiplate, automatic |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Stamped steel step-through |
| Front Suspension | Leading link (1966 - 68), telescopic fork (1969 - 79) |
| Rear Suspension | Dual shocks |
| Front Brakes | Drum |
| Rear Brakes | Drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 770 mm / 30.3 in |
| Wheelbase | 1220 mm / 48.0 in |
| Ground Clearance | — |
| Dry Weight | 87 kg / 192 lbs |
| Wet Weight | 92 kg / 203 lbs |
| WHEEL SPECS | |
| Front Tyre | 2.75-17 4PR |
| Rear Tyre | 2.75-17 4PR |
| FUEL SYSTEM | |
| Fuel Capacity | 5.5 Litres / 1.45 US gal |
| Fuel Consumption | 43 km/L / 100 mpg US |
| Top Speed | 89 km/h / 55 mph |
Photo: Brayden Richards, CC BY-SA 3.0, via Wikimedia Commons
Photo: SG2012, CC BY 2.0, via Wikimedia Commons
The CT90 replaced the pushrod CT200 in 1966, keeping its Super Cub-based step-through trail layout but switching to an 89 cc overhead-cam engine. The original dual rear sprocket gave way to a lever-shifted two-range sub-transmission in 1967, and in 1969 the leading-link front end was replaced by a telescopic fork, along with a standard rear rack. It ran until 1979, when the CT110 took over.
