| MODEL | HONDA GL 400 CUSTOM 1979 |
| Year | 1979 |
| Engine Type | Four-stroke, longitudinal 80° V-twin, OHV pushrod, 4 valves per cylinder |
| Displacement / Capacity | 396 cc / 24.2 cu in |
| Bore X Stroke | 73 x 47.4 mm |
| Compression Ratio | 10.0:1 |
| Cooling System | Liquid cooled |
| Max Power | 29.8 kW / 40 hp @ 9500 rpm |
| Max Torque | 31.4 Nm / 3.2 kgf-m / 23.2 lb-ft @ 7500 rpm |
| Ignition | Transistor |
| Induction | 2 x CV carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 5 Speed |
| Clutch | — |
| Final Drive | Shaft |
| CHASSIS SPECS | |
| Frame | Steel tube and pressed-steel diamond |
| Front Suspension | Telescopic forks |
| Rear Suspension | Dual shocks |
| Front Brakes | Single 275 mm disc, 2 piston caliper |
| Rear Brakes | 160 mm drum |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | — |
| Wheelbase | — |
| Ground Clearance | — |
| Dry Weight | 216 kg / 476 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 3.25-19 |
| Rear Tyre | 3.75-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 11 Litres / 2.9 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The GL400 Custom was the American-style cruiser version of Honda's 400 cc liquid-cooled V-twin, sold mainly in Japan from April 1979. Compared with the standard GL400 it had a teardrop tank (11 litres instead of 17), a stepped seat, pull-back bars, an aluminium radiator cover and separate speedometer and rev counter. It kept the shaft drive and Comstar wheels of the standard bike.
