| MODEL | RIEJU MARATHON PRO 125 2011 |
| Year | 2011 |
| Engine Type | Single-cylinder, four-stroke, 4 valves per cylinder, liquid cooled |
| Displacement / Capacity | 125 cc / 7.6 cu in |
| Bore X Stroke | 52 x 58.6 mm / 2 x 2.3 in |
| Compression Ratio | — |
| Cooling System | Liquid |
| Max Power | — |
| Max Torque | — |
| Ignition | — |
| Induction | Carburettor, Keihin CVEK 30 |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | — |
| Gear Box | 6-speed |
| Clutch | — |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Double cradle, steel perimeter |
| Front Suspension | Marzocchi 40 mm fork |
| Rear Suspension | Gas mono-shock, PRS system |
| Front Brakes | Single 300 mm / 11.8 in Galfer wave disc, double-piston caliper |
| Rear Brakes | Single 200 mm / 7.9 in Galfer wave disc |
| DIMENSION SPECS | |
| Overall Length | 2150 mm / 84.6 in |
| Overall Width | 800 mm / 31.5 in |
| Overall Height | 1200 mm / 47.2 in |
| Seat Height | 900 mm / 35.4 in |
| Wheelbase | 1395 mm / 54.9 in |
| Ground Clearance | — |
| Dry Weight | 107.6 kg / 237.2 lb |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 90/90-21 |
| Rear Tyre | 120/80-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 6.3 Litres / 1.66 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The Marathon 125 Pro is Rieju's learner-legal 125 cc four-stroke enduro, built around a liquid-cooled 15 hp single with a six-speed box. It pairs a steel perimeter frame with an inverted fork and a remote-reservoir rear shock, aimed at new riders who want real off-road hardware. The 2011 version is a carburettor model with a Marzocchi fork.
