| MODEL | GASGAS SM 400 FSE 2003 |
| Year | 2003 |
| Engine Type | Four-stroke, single cylinder, DOHC, 2 valves |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 90 x 62.6 mm |
| Compression Ratio | — |
| Cooling System | Liquid cooled |
| Max Power | 35 kW / 47 hp @ 9940 rpm |
| Max Torque | 43 Nm / 31.7 lb-ft @ 6570 rpm |
| Ignition | Magneti Marelli |
| Induction | Integrated fuel injection |
| Start System | Electric and kick |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Deltabox type, cromoly rectangular tubing, aluminium swingarm |
| Front Suspension | 45 mm Marzocchi fork, 295 mm / 11.6 in travel |
| Rear Suspension | Progressive linkage, Ohlins shock, 320 mm / 12.6 in travel |
| Front Brakes | Single 310 mm disc, 4-piston caliper |
| Rear Brakes | Single 220 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 900 mm / 35.4 in |
| Wheelbase | 1475 mm / 58.1 in |
| Ground Clearance | 290 mm / 11.4 in |
| Dry Weight | 118 kg / 260 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/60-17 |
| Rear Tyre | 150/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 7.5 Litres / 2.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 400 FSE was one of GasGas's first fuel-injected four-strokes, and this supermotard version swaps the enduro wheels for 17-inch road rubber and a big four-piston front brake. The short-stroke 399 cc DOHC single revs freely and gives about 47 hp.
