| MODEL | HONDA CB 400A HONDAMATIC 1978 |
| Year | 1978 |
| Engine Type | Four stroke, parallel twin cylinder, SOHC, 3 valves per cylinder |
| Displacement / Capacity | 395 cc / 24.1 cu in |
| Bore X Stroke | 70.5 x 50.6 mm |
| Compression Ratio | 9.3:1 |
| Cooling System | Air cooled |
| Max Power | 19.7 kW / 26.8 hp @ 8000 rpm |
| Max Torque | 29 Nm / 21.4 lb-ft @ 5000 rpm |
| Ignition | CDI |
| Induction | 2x 28 mm Keihin carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 2 Speed semi-automatic (torque converter) |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Diamond |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual EVO dampers with 5-way spring preload adjustment |
| Front Brakes | Single 282 mm disc |
| Rear Brakes | 153 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | — |
| Wet Weight | 189 kg / 416.7 lbs |
| WHEEL SPECS | |
| Front Tyre | 3.60 S19 |
| Rear Tyre | 4.10 S18 |
| FUEL SYSTEM | |
| Fuel Capacity | 13 Litres / 3.4 US gal |
| Fuel Consumption | — |
| Top Speed | — |
Photo: SG2012, CC BY 2.0, via Wikimedia Commons
Photo: SG2012, CC BY 2.0, via Wikimedia Commons
The CB400A was the Hondamatic member of the 1978 Hawk family: the same three-valve 395 cc twin, detuned and paired with a two-speed semi-automatic box driven through a torque converter. A parking brake lever took the place of the clutch lever, and the bike could only be started in neutral. Aimed mainly at US commuters, it was smooth and easy in traffic but performed more like a 250.
