Alder Motorcycles

Today in Motorcycle History

1949-1956 Adler M125


Air cooled single cylinder two-stroke, 123cc, B/S 54x54mm
Compression ratio 5.4:1
Amal 19D1K carburettor
multi-plate dry clutch
single ignition coil

Power: 5.6 HP at 5250 rpm, increased to 6.8hp in later models.

Lubrication: 25:1 petroil mixture.

Fuel consumption: 2.15 litres/100k

Gearbox: 4 speed

Max speed: 88 km/h

Weight: 98 kg

Tyres: 2.75x19 front and rear.

Rear suspension: plunger style with hydraulic spring dampers.

Front suspension: leading link with integral damping.

Electrical system: 6 volt 30 watt flywheel magneto.