MZ 125 SX and MZ 125 SM are model designations for motorcycles manufactured by the MZ Motorrad- und Zweiradwerk GmbH in Zschopau from 2001 to 2008. Designed by Peter Naumann, both machines were technically based on the MZ RT 125 road bike, which had been released a year earlier; the SM was derived from the SX.

History and technical details

The 125 SX is a lightweight enduro motorcycle, while the 125 SM is a lightweight supermoto and differs from the SX primarily in its 17-inch wheels, a correspondingly longer final drive ratio, and a seat height that is 30 millimeters lower. Additionally, the plastic parts on the 125 SM are painted rather than colored throughout.

One year after the start of production, in 2002, the factory launched the "MZ Youngster Cup" for young riders aged 12 and up, which was held as part of the International German Supermoto Championship. The factory-offered cup version of the 125 SM featured a Wilbers Products shock absorber, stiffer Wilbers springs in the telescopic fork, and a Sebring sport exhaust system.

In the years 2002 to 2008, the models ranked among the 10 most popular light motorcycles in terms of new registrations in Germany, despite low and declining sales figures.

Specifications MZ 125 SX MZ 125 SM image Production 2000–2008 Engine liquid-cooled single cylinder four-stroke engine, electric start Valvetrain Dual overhead camshaft (DOHC), 4 valves Bore × Stroke Displacement Compression ratio 11.2 : 1 Power rating at 9000/min max. Torque at 8500/min Introduction of fuel carburetor (Mikuni VM 24) Lubrication forced lubrication Ignition system contactless capacitor ignition Alternator Alternating current generator, 180 W Battery 12 V – 9 Ah On-board voltage 12 V Clutch multi-disk clutch in oil bath, mechanically operated Transmission 6-speed helical gearbox, claw-switched Frame single cradle steel frame Wheelbase Seat height Front suspension telescopic fork, hydraulically damped suspension Rear suspension swingarm, suspension , adjustable spring base Front rim size wire-spoke wheel, 1.85 x 21″ wire-spoke wheel, 2.75 x 17″ Rear rim size wire-spoke wheel, 2.5 x 18″ wire-spoke wheel, 4.00 x 17″ Front tire 90/90-21 110/70-17 Rear tire 120/80-18 130/70-17 Front brake single-disc brake, Ø , dual piston Rear brake single-disc brake, Ø , dual piston Curb weight Maximum load Fuel capacity 12.5 l (reserve: 3.6 l)

Special models The 125 SM remained largely unchanged throughout its production run, but numerous special editions were released, each with different paint schemes or decals. These included the "TWIN COLOUR," "GANGSTA," "MIG," and "CUP REPLICA" models. The latter was inspired by the MZ Youngster Cup and featured different handlebars. The "MIG" and "CUP REPLICA" models were equipped with engine guards and hand protectors, unlike the standard version.

In addition, there was the special edition model "SIX DAYS '87", limited to 87 units, with a green painted frame, white plastic fairing parts and red foil, inspired by the livery of the MZ factory enduros at the 1987 62nd International Six Days Enduro. They were also equipped with engine guards and hand protectors.

For the US market, there was a limited-edition version, the Fun X, as a single-seater, without turn signals and headlights.

In 2004, the French Armed Forces ordered 502 units. The motorcycles were delivered in black and are additionally equipped with handguards, a top case, a tank bag, and enhanced engine protection.

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