| MODEL | GASGAS SM 125 HALLEY 2009 |
| Year | 2009 |
| Engine Type | Two stroke, single cylinder |
| Displacement / Capacity | 124 cc / 7.6 cu in |
| Bore X Stroke | 54.5 x 54 mm |
| Compression Ratio | — |
| Cooling System | Liquid cooled |
| Max Power | 26.9 kW / 36.8 hp @ 10000 rpm |
| Max Torque | 25 Nm / 18.6 lb-ft @ 10008 rpm |
| Ignition | Kokusan digital magnetic flywheel |
| Induction | Keihin PWK carburettor |
| Start System | — |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6 speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Deltabox type built using cromoly rectangular tubes, aluminium swingarm |
| Front Suspension | 45 mm Marzocchi, 295 mm / 11.6 in wheel travel |
| Rear Suspension | Progressive system with Öhlins shock absorber, 320 mm / 12.6 in wheel travel |
| Front Brakes | Single 260 mm disc, 2 piston caliper |
| Rear Brakes | Single 220 mm disc, 1 piston caliper |
| DIMENSION SPECS | |
| Overall Length | — |
| Overall Width | — |
| Overall Height | — |
| Seat Height | 940 mm / 37.0 in |
| Wheelbase | 1475 mm / 58.1 in |
| Ground Clearance | 340 mm / 13.4 in |
| Dry Weight | 95 kg / 209.4 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/60-17 |
| Rear Tyre | 150/60-17 |
| FUEL SYSTEM | |
| Fuel Capacity | 9.5 Litres / 2.5 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 2009 SM 125 Halley was a supermotard take on GasGas's Halley line, which began with the brand's trials bikes and was aimed at younger riders. It used the standard 124 cc liquid-cooled two-stroke SM 125 package, with a six-speed gearbox, 17-inch wheels and long-travel Marzocchi and Öhlins suspension.
